skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on July 16, 2020

Title: Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE γ-ray observations with H.E.S.S.

Abstract

The flat spectrum radio quasar 3C 279 is known to exhibit pronounced variability in the high-energy (100 MeV < E < 100 GeV) γ-ray band, which is continuously monitored with Fermi-LAT. During two periods of high activity in April 2014 and June 2015 target-of-opportunity observations were undertaken with the High Energy Stereoscopic System (H.E.S.S.) in the very-high-energy (VHE, E> 100 GeV) γ-ray domain. While the observation in 2014 provides an upper limit, the observation in 2015 results in a signal with 8.7σ significance above an energy threshold of 66 GeV. No VHE variability was detected during the 2015 observations. The VHE photon spectrum is soft and described by a power-law index of 4.2 ± 0.3. The H.E.S.S. data along with a detailed and contemporaneous multiwavelength data set provide constraints on the physical parameters of the emission region. The minimum distance of the emission region from the central black hole was estimated using two plausible geometries of the broad-line region and three potential intrinsic spectra. The emission region is confidently placed at r≳1.7 × 10 17 cm from the black hole, that is beyond the assumed distance of the broad-line region. Time-dependent leptonic and lepto-hadronic one-zone models were used to describemore » the evolution of the 2015 flare. In conclusion, neither model can fully reproduce the observations, despite testing various parameter sets. Furthermore, the H.E.S.S. data were used to derive constraints on Lorentz invariance violation given the large redshift of 3C 279.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
HESS Collaboration
OSTI Identifier:
1546798
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 627; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; radiation mechanisms: non-thermal; quasars: individual; galaxies: active; relativistic processes

Citation Formats

Abdalla, H., Adam, R., Aharonian, F., Ait Benkhali, F., Angüner, E. O., Arakawa, M., Arcaro, C., Armand, C., Ashkar, H., Backes, M., Barbosa Martins, V., Barnard, M., Becherini, Y., Berge, D., Bernlöhr, K., Blackwell, R., Böttcher, M., Boisson, C., Bolmont, J., Bonnefoy, S., Bregeon, J., Breuhaus, M., Brun, F., Brun, P., Bryan, M., Büchele, M., Bulik, T., Bylund, T., Capasso, M., Caroff, S., Carosi, A., Casanova, S., Cerruti, M., Chand, T., Chandra, S., Chen, A., Colafrancesco, S., Curyło, M., Davids, I. D., Deil, C., Devin, J., deWilt, P., Dirson, L., Djannati-Ataï, A., Dmytriiev, A., Donath, A., Doroshenko, V., Drury, L. O’C., Dyks, J., Egberts, K., Emery, G., Ernenwein, J. -P., Eschbach, S., Feijen, K., Fegan, S., Fiasson, A., Fontaine, G., Funk, S., Füßling, M., Gabici, S., Gallant, Y. A., Gaté, F., Giavitto, G., Glawion, D., Glicenstein, J. F., Gottschall, D., Grondin, M. -H., Hahn, J., Haupt, M., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J. A., Hofmann, W., Hoischen, C., Holch, T. L., Holler, M., Horns, D., Huber, D., Iwasaki, H., Jamrozy, M., Jankowsky, D., Jankowsky, F., Jardin-Blicq, A., Jung-Richardt, I., Kastendieck, M. A., Katarzyński, K., Katsuragawa, M., Katz, U., Khangulyan, D., Khélifi, B., King, J., Klepser, S., Kluźniak, W., Komin, Nu., Kosack, K., Kostunin, D., Kraus, M., Lamanna, G., Lau, J., Lemière, A., Lemoine-Goumard, M., Lenain, J. -P., Leser, E., Levy, C., Lohse, T., Lypova, I., Mackey, J., Majumdar, J., Malyshev, D., Marandon, V., Marcowith, A., Mares, A., Mariaud, C., Martí-Devesa, G., Marx, R., Maurin, G., Meintjes, P. J., Mitchell, A. M. W., Moderski, R., Mohamed, M., Mohrmann, L., Moore, C., Moulin, E., Muller, J., Murach, T., Nakashima, S., de Naurois, M., Ndiyavala, H., Niederwanger, F., Niemiec, J., Oakes, L., O’Brien, P., Odaka, H., Ohm, S., de Ona Wilhelmi, E., Ostrowski, M., Oya, I., Panter, M., Parsons, R. D., Perennes, C., Petrucci, P. -O., Peyaud, B., Piel, Q., Pita, S., Poireau, V., Priyana Noel, A., Prokhorov, D. A., Prokoph, H., Pühlhofer, G., Punch, M., Quirrenbach, A., Raab, S., Rauth, R., Reimer, A., Reimer, O., Remy, Q., Renaud, M., Rieger, F., Rinchiuso, L., Romoli, C., Rowell, G., Rudak, B., Ruiz-Velasco, E., Sahakian, V., Saito, S., Sanchez, D. A., Santangelo, A., Sasaki, M., Schlickeiser, R., Schüssler, F., Schulz, A., Schutte, H., Schwanke, U., Schwemmer, S., Seglar-Arroyo, M., Senniappan, M., Seyffert, A. S., Shafi, N., Shiningayamwe, K., Simoni, R., Sinha, A., Sol, H., Specovius, A., Spir-Jacob, M., Stawarz, L., Steenkamp, R., Stegmann, C., Steppa, C., Takahashi, T., Tavernier, T., Taylor, A. M., Terrier, R., Tiziani, D., Tluczykont, M., Trichard, C., Tsirou, M., Tsuji, N., Tuffs, R., Uchiyama, Y., van der Walt, D. J., van Eldik, C., van Rensburg, C., van Soelen, B., Vasileiadis, G., Veh, J., Venter, C., Vincent, P., Vink, J., Voisin, F., Völk, H. J., Vuillaume, T., Wadiasingh, Z., Wagner, S. J., White, R., Wierzcholska, A., Yang, R., Yoneda, H., Zacharias, M., Zanin, R., Zdziarski, A. A., Zech, A., Ziegler, A., Zorn, J., Żywucka, N., and Meyer, M. Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE γ-ray observations with H.E.S.S.. United States: N. p., 2019. Web. doi:10.1051/0004-6361/201935704.
Abdalla, H., Adam, R., Aharonian, F., Ait Benkhali, F., Angüner, E. O., Arakawa, M., Arcaro, C., Armand, C., Ashkar, H., Backes, M., Barbosa Martins, V., Barnard, M., Becherini, Y., Berge, D., Bernlöhr, K., Blackwell, R., Böttcher, M., Boisson, C., Bolmont, J., Bonnefoy, S., Bregeon, J., Breuhaus, M., Brun, F., Brun, P., Bryan, M., Büchele, M., Bulik, T., Bylund, T., Capasso, M., Caroff, S., Carosi, A., Casanova, S., Cerruti, M., Chand, T., Chandra, S., Chen, A., Colafrancesco, S., Curyło, M., Davids, I. D., Deil, C., Devin, J., deWilt, P., Dirson, L., Djannati-Ataï, A., Dmytriiev, A., Donath, A., Doroshenko, V., Drury, L. O’C., Dyks, J., Egberts, K., Emery, G., Ernenwein, J. -P., Eschbach, S., Feijen, K., Fegan, S., Fiasson, A., Fontaine, G., Funk, S., Füßling, M., Gabici, S., Gallant, Y. A., Gaté, F., Giavitto, G., Glawion, D., Glicenstein, J. F., Gottschall, D., Grondin, M. -H., Hahn, J., Haupt, M., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J. A., Hofmann, W., Hoischen, C., Holch, T. L., Holler, M., Horns, D., Huber, D., Iwasaki, H., Jamrozy, M., Jankowsky, D., Jankowsky, F., Jardin-Blicq, A., Jung-Richardt, I., Kastendieck, M. A., Katarzyński, K., Katsuragawa, M., Katz, U., Khangulyan, D., Khélifi, B., King, J., Klepser, S., Kluźniak, W., Komin, Nu., Kosack, K., Kostunin, D., Kraus, M., Lamanna, G., Lau, J., Lemière, A., Lemoine-Goumard, M., Lenain, J. -P., Leser, E., Levy, C., Lohse, T., Lypova, I., Mackey, J., Majumdar, J., Malyshev, D., Marandon, V., Marcowith, A., Mares, A., Mariaud, C., Martí-Devesa, G., Marx, R., Maurin, G., Meintjes, P. J., Mitchell, A. M. W., Moderski, R., Mohamed, M., Mohrmann, L., Moore, C., Moulin, E., Muller, J., Murach, T., Nakashima, S., de Naurois, M., Ndiyavala, H., Niederwanger, F., Niemiec, J., Oakes, L., O’Brien, P., Odaka, H., Ohm, S., de Ona Wilhelmi, E., Ostrowski, M., Oya, I., Panter, M., Parsons, R. D., Perennes, C., Petrucci, P. -O., Peyaud, B., Piel, Q., Pita, S., Poireau, V., Priyana Noel, A., Prokhorov, D. A., Prokoph, H., Pühlhofer, G., Punch, M., Quirrenbach, A., Raab, S., Rauth, R., Reimer, A., Reimer, O., Remy, Q., Renaud, M., Rieger, F., Rinchiuso, L., Romoli, C., Rowell, G., Rudak, B., Ruiz-Velasco, E., Sahakian, V., Saito, S., Sanchez, D. A., Santangelo, A., Sasaki, M., Schlickeiser, R., Schüssler, F., Schulz, A., Schutte, H., Schwanke, U., Schwemmer, S., Seglar-Arroyo, M., Senniappan, M., Seyffert, A. S., Shafi, N., Shiningayamwe, K., Simoni, R., Sinha, A., Sol, H., Specovius, A., Spir-Jacob, M., Stawarz, L., Steenkamp, R., Stegmann, C., Steppa, C., Takahashi, T., Tavernier, T., Taylor, A. M., Terrier, R., Tiziani, D., Tluczykont, M., Trichard, C., Tsirou, M., Tsuji, N., Tuffs, R., Uchiyama, Y., van der Walt, D. J., van Eldik, C., van Rensburg, C., van Soelen, B., Vasileiadis, G., Veh, J., Venter, C., Vincent, P., Vink, J., Voisin, F., Völk, H. J., Vuillaume, T., Wadiasingh, Z., Wagner, S. J., White, R., Wierzcholska, A., Yang, R., Yoneda, H., Zacharias, M., Zanin, R., Zdziarski, A. A., Zech, A., Ziegler, A., Zorn, J., Żywucka, N., & Meyer, M. Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE γ-ray observations with H.E.S.S.. United States. doi:10.1051/0004-6361/201935704.
Abdalla, H., Adam, R., Aharonian, F., Ait Benkhali, F., Angüner, E. O., Arakawa, M., Arcaro, C., Armand, C., Ashkar, H., Backes, M., Barbosa Martins, V., Barnard, M., Becherini, Y., Berge, D., Bernlöhr, K., Blackwell, R., Böttcher, M., Boisson, C., Bolmont, J., Bonnefoy, S., Bregeon, J., Breuhaus, M., Brun, F., Brun, P., Bryan, M., Büchele, M., Bulik, T., Bylund, T., Capasso, M., Caroff, S., Carosi, A., Casanova, S., Cerruti, M., Chand, T., Chandra, S., Chen, A., Colafrancesco, S., Curyło, M., Davids, I. D., Deil, C., Devin, J., deWilt, P., Dirson, L., Djannati-Ataï, A., Dmytriiev, A., Donath, A., Doroshenko, V., Drury, L. O’C., Dyks, J., Egberts, K., Emery, G., Ernenwein, J. -P., Eschbach, S., Feijen, K., Fegan, S., Fiasson, A., Fontaine, G., Funk, S., Füßling, M., Gabici, S., Gallant, Y. A., Gaté, F., Giavitto, G., Glawion, D., Glicenstein, J. F., Gottschall, D., Grondin, M. -H., Hahn, J., Haupt, M., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J. A., Hofmann, W., Hoischen, C., Holch, T. L., Holler, M., Horns, D., Huber, D., Iwasaki, H., Jamrozy, M., Jankowsky, D., Jankowsky, F., Jardin-Blicq, A., Jung-Richardt, I., Kastendieck, M. A., Katarzyński, K., Katsuragawa, M., Katz, U., Khangulyan, D., Khélifi, B., King, J., Klepser, S., Kluźniak, W., Komin, Nu., Kosack, K., Kostunin, D., Kraus, M., Lamanna, G., Lau, J., Lemière, A., Lemoine-Goumard, M., Lenain, J. -P., Leser, E., Levy, C., Lohse, T., Lypova, I., Mackey, J., Majumdar, J., Malyshev, D., Marandon, V., Marcowith, A., Mares, A., Mariaud, C., Martí-Devesa, G., Marx, R., Maurin, G., Meintjes, P. J., Mitchell, A. M. W., Moderski, R., Mohamed, M., Mohrmann, L., Moore, C., Moulin, E., Muller, J., Murach, T., Nakashima, S., de Naurois, M., Ndiyavala, H., Niederwanger, F., Niemiec, J., Oakes, L., O’Brien, P., Odaka, H., Ohm, S., de Ona Wilhelmi, E., Ostrowski, M., Oya, I., Panter, M., Parsons, R. D., Perennes, C., Petrucci, P. -O., Peyaud, B., Piel, Q., Pita, S., Poireau, V., Priyana Noel, A., Prokhorov, D. A., Prokoph, H., Pühlhofer, G., Punch, M., Quirrenbach, A., Raab, S., Rauth, R., Reimer, A., Reimer, O., Remy, Q., Renaud, M., Rieger, F., Rinchiuso, L., Romoli, C., Rowell, G., Rudak, B., Ruiz-Velasco, E., Sahakian, V., Saito, S., Sanchez, D. A., Santangelo, A., Sasaki, M., Schlickeiser, R., Schüssler, F., Schulz, A., Schutte, H., Schwanke, U., Schwemmer, S., Seglar-Arroyo, M., Senniappan, M., Seyffert, A. S., Shafi, N., Shiningayamwe, K., Simoni, R., Sinha, A., Sol, H., Specovius, A., Spir-Jacob, M., Stawarz, L., Steenkamp, R., Stegmann, C., Steppa, C., Takahashi, T., Tavernier, T., Taylor, A. M., Terrier, R., Tiziani, D., Tluczykont, M., Trichard, C., Tsirou, M., Tsuji, N., Tuffs, R., Uchiyama, Y., van der Walt, D. J., van Eldik, C., van Rensburg, C., van Soelen, B., Vasileiadis, G., Veh, J., Venter, C., Vincent, P., Vink, J., Voisin, F., Völk, H. J., Vuillaume, T., Wadiasingh, Z., Wagner, S. J., White, R., Wierzcholska, A., Yang, R., Yoneda, H., Zacharias, M., Zanin, R., Zdziarski, A. A., Zech, A., Ziegler, A., Zorn, J., Żywucka, N., and Meyer, M. Tue . "Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE γ-ray observations with H.E.S.S.". United States. doi:10.1051/0004-6361/201935704.
@article{osti_1546798,
title = {Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE γ-ray observations with H.E.S.S.},
author = {Abdalla, H. and Adam, R. and Aharonian, F. and Ait Benkhali, F. and Angüner, E. O. and Arakawa, M. and Arcaro, C. and Armand, C. and Ashkar, H. and Backes, M. and Barbosa Martins, V. and Barnard, M. and Becherini, Y. and Berge, D. and Bernlöhr, K. and Blackwell, R. and Böttcher, M. and Boisson, C. and Bolmont, J. and Bonnefoy, S. and Bregeon, J. and Breuhaus, M. and Brun, F. and Brun, P. and Bryan, M. and Büchele, M. and Bulik, T. and Bylund, T. and Capasso, M. and Caroff, S. and Carosi, A. and Casanova, S. and Cerruti, M. and Chand, T. and Chandra, S. and Chen, A. and Colafrancesco, S. and Curyło, M. and Davids, I. D. and Deil, C. and Devin, J. and deWilt, P. and Dirson, L. and Djannati-Ataï, A. and Dmytriiev, A. and Donath, A. and Doroshenko, V. and Drury, L. O’C. and Dyks, J. and Egberts, K. and Emery, G. and Ernenwein, J. -P. and Eschbach, S. and Feijen, K. and Fegan, S. and Fiasson, A. and Fontaine, G. and Funk, S. and Füßling, M. and Gabici, S. and Gallant, Y. A. and Gaté, F. and Giavitto, G. and Glawion, D. and Glicenstein, J. F. and Gottschall, D. and Grondin, M. -H. and Hahn, J. and Haupt, M. and Heinzelmann, G. and Henri, G. and Hermann, G. and Hinton, J. A. and Hofmann, W. and Hoischen, C. and Holch, T. L. and Holler, M. and Horns, D. and Huber, D. and Iwasaki, H. and Jamrozy, M. and Jankowsky, D. and Jankowsky, F. and Jardin-Blicq, A. and Jung-Richardt, I. and Kastendieck, M. A. and Katarzyński, K. and Katsuragawa, M. and Katz, U. and Khangulyan, D. and Khélifi, B. and King, J. and Klepser, S. and Kluźniak, W. and Komin, Nu. and Kosack, K. and Kostunin, D. and Kraus, M. and Lamanna, G. and Lau, J. and Lemière, A. and Lemoine-Goumard, M. and Lenain, J. -P. and Leser, E. and Levy, C. and Lohse, T. and Lypova, I. and Mackey, J. and Majumdar, J. and Malyshev, D. and Marandon, V. and Marcowith, A. and Mares, A. and Mariaud, C. and Martí-Devesa, G. and Marx, R. and Maurin, G. and Meintjes, P. J. and Mitchell, A. M. W. and Moderski, R. and Mohamed, M. and Mohrmann, L. and Moore, C. and Moulin, E. and Muller, J. and Murach, T. and Nakashima, S. and de Naurois, M. and Ndiyavala, H. and Niederwanger, F. and Niemiec, J. and Oakes, L. and O’Brien, P. and Odaka, H. and Ohm, S. and de Ona Wilhelmi, E. and Ostrowski, M. and Oya, I. and Panter, M. and Parsons, R. D. and Perennes, C. and Petrucci, P. -O. and Peyaud, B. and Piel, Q. and Pita, S. and Poireau, V. and Priyana Noel, A. and Prokhorov, D. A. and Prokoph, H. and Pühlhofer, G. and Punch, M. and Quirrenbach, A. and Raab, S. and Rauth, R. and Reimer, A. and Reimer, O. and Remy, Q. and Renaud, M. and Rieger, F. and Rinchiuso, L. and Romoli, C. and Rowell, G. and Rudak, B. and Ruiz-Velasco, E. and Sahakian, V. and Saito, S. and Sanchez, D. A. and Santangelo, A. and Sasaki, M. and Schlickeiser, R. and Schüssler, F. and Schulz, A. and Schutte, H. and Schwanke, U. and Schwemmer, S. and Seglar-Arroyo, M. and Senniappan, M. and Seyffert, A. S. and Shafi, N. and Shiningayamwe, K. and Simoni, R. and Sinha, A. and Sol, H. and Specovius, A. and Spir-Jacob, M. and Stawarz, L. and Steenkamp, R. and Stegmann, C. and Steppa, C. and Takahashi, T. and Tavernier, T. and Taylor, A. M. and Terrier, R. and Tiziani, D. and Tluczykont, M. and Trichard, C. and Tsirou, M. and Tsuji, N. and Tuffs, R. and Uchiyama, Y. and van der Walt, D. J. and van Eldik, C. and van Rensburg, C. and van Soelen, B. and Vasileiadis, G. and Veh, J. and Venter, C. and Vincent, P. and Vink, J. and Voisin, F. and Völk, H. J. and Vuillaume, T. and Wadiasingh, Z. and Wagner, S. J. and White, R. and Wierzcholska, A. and Yang, R. and Yoneda, H. and Zacharias, M. and Zanin, R. and Zdziarski, A. A. and Zech, A. and Ziegler, A. and Zorn, J. and Żywucka, N. and Meyer, M.},
abstractNote = {The flat spectrum radio quasar 3C 279 is known to exhibit pronounced variability in the high-energy (100 MeV < E < 100 GeV) γ-ray band, which is continuously monitored with Fermi-LAT. During two periods of high activity in April 2014 and June 2015 target-of-opportunity observations were undertaken with the High Energy Stereoscopic System (H.E.S.S.) in the very-high-energy (VHE, E> 100 GeV) γ-ray domain. While the observation in 2014 provides an upper limit, the observation in 2015 results in a signal with 8.7σ significance above an energy threshold of 66 GeV. No VHE variability was detected during the 2015 observations. The VHE photon spectrum is soft and described by a power-law index of 4.2 ± 0.3. The H.E.S.S. data along with a detailed and contemporaneous multiwavelength data set provide constraints on the physical parameters of the emission region. The minimum distance of the emission region from the central black hole was estimated using two plausible geometries of the broad-line region and three potential intrinsic spectra. The emission region is confidently placed at r≳1.7 × 1017 cm from the black hole, that is beyond the assumed distance of the broad-line region. Time-dependent leptonic and lepto-hadronic one-zone models were used to describe the evolution of the 2015 flare. In conclusion, neither model can fully reproduce the observations, despite testing various parameter sets. Furthermore, the H.E.S.S. data were used to derive constraints on Lorentz invariance violation given the large redshift of 3C 279.},
doi = {10.1051/0004-6361/201935704},
journal = {Astronomy and Astrophysics},
number = ,
volume = 627,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 16, 2020
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Gamma-ray opacity of the anisotropic stratified broad-line regions in blazars
journal, September 2016

  • Abolmasov, Pavel; Poutanen, Juri
  • Monthly Notices of the Royal Astronomical Society, Vol. 464, Issue 1
  • DOI: 10.1093/mnras/stw2326

FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG
journal, June 2015

  • Acero, F.; Ackermann, M.; Ajello, M.
  • The Astrophysical Journal Supplement Series, Vol. 218, Issue 2
  • DOI: 10.1088/0067-0049/218/2/23

MINUTE-TIMESCALE >100 MeV γ -RAY VARIABILITY DURING THE GIANT OUTBURST OF QUASAR 3C 279 OBSERVED BY FERMI -LAT IN 2015 JUNE
journal, June 2016


MAGIC Observations and multiwavelength properties of the quasar 3C 279 in 2007 and 2009
journal, April 2011


MAGIC observations and multifrequency properties of the flat spectrum radio quasar 3C 279 in 2011
journal, July 2014


Quantum-Spacetime Phenomenology
journal, June 2013

  • Amelino-Camelia, Giovanni
  • Living Reviews in Relativity, Vol. 16, Issue 1
  • DOI: 10.12942/lrr-2013-5

Upper Limits from five Years of Blazar Observations with the Veritas Cherenkov Telescopes
journal, May 2016


THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
journal, May 2009


PKS 1510-089: a rare example of a flat spectrum radio quasar with a very high-energy emission
journal, July 2014


The Burst Alert Telescope (BAT) on the SWIFT Midex Mission
journal, October 2005

  • Barthelmy, Scott D.; Barbier, Louis M.; Cummings, Jay R.
  • Space Science Reviews, Vol. 120, Issue 3-4
  • DOI: 10.1007/s11214-005-5096-3

The 1% Concordance Hubble Constant
journal, October 2014


A 'Twin-Exhaust' Model for Double Radio Sources
journal, December 1974

  • Blandford, R. D.; Rees, M. J.
  • Monthly Notices of the Royal Astronomical Society, Vol. 169, Issue 3
  • DOI: 10.1093/mnras/169.3.395

Smarts Optical and Infrared Monitoring of 12 Gamma-Ray Bright Blazars
journal, August 2012


3C 279 IN OUTBURST IN 2015 JUNE: A BROADBAND SED STUDY BASED ON THE INTEGRAL DETECTION
journal, November 2016


Modeling the emission processes in blazars
journal, April 2007


Gamma–Gamma Absorption in the Broad line Region Radiation Fields of Gamma-Ray Blazars
journal, April 2016


Implications of the very high Energy Gamma-Ray Detection of the Quasar 3c279
journal, September 2009


The Redshift of the Quasi-Stellar Radio Source 3c 279.
journal, November 1965

  • Burbidge, E. Margaret; Rosenberg, Fred D.
  • The Astrophysical Journal, Vol. 142
  • DOI: 10.1086/148458

The Swift X-Ray Telescope
journal, October 2005


Particle diffusion and localized acceleration in inhomogeneous AGN jets – I. Steady-state spectra
journal, December 2014

  • Chen, Xuhui; Pohl, Martin; Böttcher, Markus
  • Monthly Notices of the Royal Astronomical Society, Vol. 447, Issue 1
  • DOI: 10.1093/mnras/stu2438

On the origin of gamma-rays in Fermi blazars: beyondthe broad-line region
journal, May 2018

  • Costamante, L.; Cutini, S.; Tosti, G.
  • Monthly Notices of the Royal Astronomical Society, Vol. 477, Issue 4
  • DOI: 10.1093/mnras/sty887

A high performance likelihood reconstruction of γ-rays for imaging atmospheric Cherenkov telescopes
journal, December 2009


Time dependent leptonic modeling of Fermi II processes in the jets of flat spectrum radio quasars
journal, May 2014


Leptonic and Lepto-Hadronic Modeling of the 2010 November Flare from 3c 454.3
journal, July 2016


The extragalactic background light and the gamma-ray opacity of the universe
journal, March 2013


Unified approach to the classical statistical analysis of small signals
journal, April 1998


External Compton Scattering in Blazar jets and the Location of the Gamma-Ray Emitting Region
journal, October 2016


Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
journal, June 2008


The Swift Gamma‐Ray Burst Mission
journal, August 2004

  • Gehrels, N.; Chincarini, G.; Giommi, P.
  • The Astrophysical Journal, Vol. 611, Issue 2
  • DOI: 10.1086/422091

Structured jets in TeV BL Lac objects and radiogalaxies: Implications for the observed properties
journal, March 2005


Reconnection-driven plasmoids in blazars: fast flares on a slow envelope
journal, February 2013

  • Giannios, Dimitrios
  • Monthly Notices of the Royal Astronomical Society, Vol. 431, Issue 1
  • DOI: 10.1093/mnras/stt167

Swift and infra-red observations of the blazar 3C 454.3 during the giant X-ray flare of May 2005
journal, September 2006


Optical and Near-Infrared Calibration of AGN Field Stars: An All-Sky Network of Faint Stars Calibrated on the Landolt System
journal, October 2001

  • González-Pérez, José Nicolás; Kidger, Mark R.; Martín-Luis, Fabiola
  • The Astronomical Journal, Vol. 122, Issue 4
  • DOI: 10.1086/322129

The Third EGRET Catalog of High‐Energy Gamma‐Ray Sources
journal, July 1999

  • Hartman, R. C.; Bertsch, D. L.; Bloom, S. D.
  • The Astrophysical Journal Supplement Series, Vol. 123, Issue 1
  • DOI: 10.1086/313231

ATOM - an Automatic Telescope for Optical Monitoring
journal, October 2004

  • Hauser, M.; Möllenhoff, C.; Pühlhofer, G.
  • Astronomische Nachrichten, Vol. 325, Issue 6-8
  • DOI: 10.1002/asna.200410305

The Structure and Emission Model of the Relativistic jet in the Quasar 3c 279 Inferred from Radio to High-Energy γ-Ray Observations in 2008-2010
journal, July 2012


Observations of the Crab nebula with HESS
journal, September 2006

  • Aharonian, F.; Akhperjanian, A. G.; Bazer-Bachi, A. R.
  • Astronomy & Astrophysics, Vol. 457, Issue 3
  • DOI: 10.1051/0004-6361:20065351

Search for Lorentz Invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944
journal, April 2011


Flux upper limits for 47 AGN observed with H.E.S.S. in 2004−2011
journal, March 2014


THE 2012 FLARE OF PG 1553+113 SEEN WITH H.E.S.S. AND FERMI -LAT
journal, March 2015


Gamma-ray blazar spectra with H.E.S.S. II mono analysis: The case of PKS 2155−304 and PG 1553+113
journal, April 2017


The 2014 TeV γ -Ray Flare of Mrk 501 Seen with H.E.S.S.: Temporal and Spectral Constraints on Lorentz Invariance Violation
journal, January 2019

  • Abdalla, H.; Aharonian, F.; Benkhali, F. Ait
  • The Astrophysical Journal, Vol. 870, Issue 2
  • DOI: 10.3847/1538-4357/aaf1c4

The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
journal, September 2005


Reverberation Mapping of High‐Luminosity Quasars: First Results
journal, April 2007

  • Kaspi, Shai; Brandt, W. N.; Maoz, Dan
  • The Astrophysical Journal, Vol. 659, Issue 2
  • DOI: 10.1086/512094

Analysis methods for results in gamma-ray astronomy
journal, September 1983

  • Li, T. -P.; Ma, Y. -Q.
  • The Astrophysical Journal, Vol. 272
  • DOI: 10.1086/161295

Mojave. x. Parsec-Scale jet Orientation Variations and Superluminal Motion in Active Galactic Nuclei
journal, October 2013


The Jet Power, Radio Loudness, and Black Hole Mass in Radio‐loud Active Galactic Nuclei
journal, February 2006

  • Liu, Yi; Jiang, Dong Rong; Gu, Min Feng
  • The Astrophysical Journal, Vol. 637, Issue 2
  • DOI: 10.1086/498639

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
journal, June 2008


Constraining Lorentz Invariance Violation Using the Crab Pulsar Emission Observed up to TeV Energies by MAGIC
journal, September 2017

  • Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
  • The Astrophysical Journal Supplement Series, Vol. 232, Issue 1
  • DOI: 10.3847/1538-4365/aa8404

Turbulent, Extreme Multi-Zone Model for Simulating flux and Polarization Variability in Blazars
journal, December 2013


A new approach to study energy-dependent arrival delays on photons from astrophysical sources
journal, April 2009


Comparative Analysis of the High- and Low-Ionization Lines in the Broad-Line Region of Active Galactic Nuclei
journal, May 1996

  • Marziani, P.; Sulentic, J. W.; Dultzin-Hacyan, D.
  • The Astrophysical Journal Supplement Series, Vol. 104
  • DOI: 10.1086/192291

The Likelihood Analysis of EGRET Data
journal, April 1996

  • Mattox, J. R.; Bertsch, D. L.; Chiang, J.
  • The Astrophysical Journal, Vol. 461
  • DOI: 10.1086/177068

Characterizing the Gamma-Ray Variability of the Brightest Flat Spectrum Radio Quasars Observed with the Fermi LAT
journal, May 2019

  • Meyer, Manuel; Scargle, Jeffrey D.; Blandford, Roger D.
  • The Astrophysical Journal, Vol. 877, Issue 1
  • DOI: 10.3847/1538-4357/ab1651

Revisiting the Unified Model of Active Galactic Nuclei
journal, August 2015


FERMI -LARGE AREA TELESCOPE OBSERVATIONS OF THE EXCEPTIONAL GAMMA-RAY FLARE FROM 3C 279 IN 2015 JUNE
journal, July 2015


Multi-Wavelength Observations of 3c 279 During the Extremely Bright Gamma-Ray Flare in 2014 March–April
journal, April 2015

  • Paliya, Vaidehi S.; Sahayanathan, S.; Stalin, C. S.
  • The Astrophysical Journal, Vol. 803, Issue 1
  • DOI: 10.1088/0004-637X/803/1/15

A Monte Carlo template based analysis for air-Cherenkov arrays
journal, April 2014


A hadronic minute-scale GeV flare from quasar 3C 279?
journal, December 2016

  • Petropoulou, M.; Nalewajko, K.; Hayashida, M.
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 467, Issue 1
  • DOI: 10.1093/mnrasl/slw252

Photometric calibration of the Swift ultraviolet/optical telescope: Photometric calibration of the Swift UVOT
journal, December 2007


The Swift Ultra-Violet/Optical Telescope
journal, October 2005

  • Roming, Peter W. A.; Kennedy, Thomas E.; Mason, Keith O.
  • Space Science Reviews, Vol. 120, Issue 3-4
  • DOI: 10.1007/s11214-005-5095-4

Measuring Reddening with Sloan Digital sky Survey Stellar Spectra and Recalibrating sfd
journal, August 2011


Constraints on Lorentz invariance violation from Fermi -Large Area Telescope observations of gamma-ray bursts
journal, June 2013


THE BRIGHTEST GAMMA-RAY FLARING BLAZAR IN THE SKY: AGILE AND MULTI-WAVELENGTH OBSERVATIONS OF 3C 454.3 DURING 2010 NOVEMBER
journal, July 2011


Meeting the Challenge from Bright and Fast Gamma-Ray Flares of 3C 279
journal, July 2017


A self-consistent and time-dependent hybrid blazar emission model: Properties and application
journal, December 2014


The Extended Flare in CTA 102 in 2016 and 2017 within a Hadronic Model through Cloud Ablation by the Relativistic Jet
journal, January 2019

  • Zacharias, M.; Böttcher, M.; Jankowsky, F.
  • The Astrophysical Journal, Vol. 871, Issue 1
  • DOI: 10.3847/1538-4357/aaf4f7

Hadronic models of blazars require a change of the accretion paradigm
journal, April 2015

  • Zdziarski, Andrzej A.; Böttcher, Markus
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 450, Issue 1
  • DOI: 10.1093/mnrasl/slv039