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Title: Identification of γ-ray emission from 3C 345 and NRAO 512

Abstract

For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991–2000), it has remained an open question why the prominent blazar 3C 345 was not reliably detected at γ-ray energies ≥ 20 MeV. Recently a bright γ-ray source (0FGL J1641.4+3939/1FGL J1642.5+3947), potentially associated with 3C 345, was detected by the Large Area Telescope (LAT) on Fermi. Multiwavelength observations from radio bands to X-rays (mainly GASP-WEBT and Swift) of possible counterparts (3C 345, NRAO 512, B3 1640 + 396) were combined with 20 months of Fermi-LAT monitoring data (August 2008 – April 2010) to associate and identify the dominating γ-ray emitting counterpart of 1FGL J1642.5+3947. The source 3C 345 is identified as the main contributor for this γ-ray emitting region. However, after November 2009 (15 months), a significant excess of photons from the nearby quasar NRAO 512 started to contribute and thereafter was detected with increasing γ-ray activity, possibly adding flux to 1FGL J1642.5+3947. As a result, for the same time period and during the summer of 2010, an increase of radio, optical and X-ray activity of NRAO 512 was observed. No γ-ray emission from B3 1640 + 396more » was detected.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [10];  [11];  [12];  [13];  [14];  [15];  [16];  [17];  [18];  [19] more »;  [12];  [12];  [17];  [19];  [19];  [20];  [21];  [12];  [18];  [12];  [19];  [15];  [22];  [19];  [23];  [12];  [23];  [1];  [1] « less
  1. Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
  2. Max-Planck-Institut fur Radioastronomie, Bonn (Germany); Astro Space Center of Lebedev Physical Institute, Moscow (Russia)
  3. INAF-IASF, Palermo (Italy); INAF-IASF, Roma (Italy)
  4. Univ. of Washington, Seattle, WA (United States)
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  6. Naval Research Lab., Washington, D.C. (United States)
  7. Ecole polytechnique, Palaiseau (France)
  8. CEA-IRFU/CNRS/Univ. Paris Diderot, Gif-sur-Yvette (France)
  9. Univ. of Chicago, Chicago, IL (United States)
  10. INAF - Osservatorio Astronomico di Torino, Pino Torinese (TO) (Italy)
  11. Boston Univ., Boston, MA (United States); Instituto de Astrofisica de Andalucia, Granada (Spain)
  12. St. Petersburg State Univ., St. Petersburg (Russia)
  13. EPT Observatories, La Palma (Spain); INAF, La Palma (Spain)
  14. Institut de Ciencies de l'Espai (IEEC-CSIC), Barcelona (Spain)
  15. Instituto de Astrofisica de Andalucia, Granada (Spain)
  16. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  17. National Central Univ., Jhongli (Taiwan)
  18. Boston Univ., Boston, MA (United States)
  19. Abastumani Observatory, Abastumani (Georgia)
  20. Isaac Newton Institute of Chile, St. Petersburg (Russia); Pulkovo Astronomical Observatory, St. Petersburg (Russia); St. Petersburg State Univ., St. Petersburg (Russia)
  21. INAF-IASF, Roma (Italy)
  22. Agrupacio Astonomica de Sabadell, Sabadell (Spain)
  23. Special Astrophysical Observatory, Karachai-Cherkessian Republic (Russia)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357204
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 532; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; quasars: individual: 3C 345; gamma rays: galaxies; quasars: individual: NRAO 512; quasars: individual: B3 1640+396

Citation Formats

Schinzel, F. K., Sokolovsky, K. V., D’Ammando, F., Burnett, T. H., Max-Moerbeck, W., Cheung, C. C., Fegan, S. J., Casandjian, J. M., Reyes, L. C., Villata, M., Raiteri, C. M., Agudo, I., Bravo Calle, O. J. A., Carosati, D., Casas, R., Gómez, J. L., Gurwell, M. A., Hsiao, H. Y., Jorstad, S. G., Kimeridze, G., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O. M., Kurtanidze, S. O., Larionov, V. M., Larionova, E. G., Larionova, L. V., Marscher, A. P., Morozova, D. A., Nikolashvili, M. G., Roca-Sogorb, M., Ros, J. A., Sigua, L. A., Spiridonova, O., Troitsky, I. S., Vlasyuk, V. V., Lobanov, A. P., and Zensus, J. A.. Identification of γ-ray emission from 3C 345 and NRAO 512. United States: N. p., 2011. Web. doi:10.1051/0004-6361/201016145.
Schinzel, F. K., Sokolovsky, K. V., D’Ammando, F., Burnett, T. H., Max-Moerbeck, W., Cheung, C. C., Fegan, S. J., Casandjian, J. M., Reyes, L. C., Villata, M., Raiteri, C. M., Agudo, I., Bravo Calle, O. J. A., Carosati, D., Casas, R., Gómez, J. L., Gurwell, M. A., Hsiao, H. Y., Jorstad, S. G., Kimeridze, G., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O. M., Kurtanidze, S. O., Larionov, V. M., Larionova, E. G., Larionova, L. V., Marscher, A. P., Morozova, D. A., Nikolashvili, M. G., Roca-Sogorb, M., Ros, J. A., Sigua, L. A., Spiridonova, O., Troitsky, I. S., Vlasyuk, V. V., Lobanov, A. P., & Zensus, J. A.. Identification of γ-ray emission from 3C 345 and NRAO 512. United States. doi:10.1051/0004-6361/201016145.
Schinzel, F. K., Sokolovsky, K. V., D’Ammando, F., Burnett, T. H., Max-Moerbeck, W., Cheung, C. C., Fegan, S. J., Casandjian, J. M., Reyes, L. C., Villata, M., Raiteri, C. M., Agudo, I., Bravo Calle, O. J. A., Carosati, D., Casas, R., Gómez, J. L., Gurwell, M. A., Hsiao, H. Y., Jorstad, S. G., Kimeridze, G., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O. M., Kurtanidze, S. O., Larionov, V. M., Larionova, E. G., Larionova, L. V., Marscher, A. P., Morozova, D. A., Nikolashvili, M. G., Roca-Sogorb, M., Ros, J. A., Sigua, L. A., Spiridonova, O., Troitsky, I. S., Vlasyuk, V. V., Lobanov, A. P., and Zensus, J. A.. Tue . "Identification of γ-ray emission from 3C 345 and NRAO 512". United States. doi:10.1051/0004-6361/201016145. https://www.osti.gov/servlets/purl/1357204.
@article{osti_1357204,
title = {Identification of γ-ray emission from 3C 345 and NRAO 512},
author = {Schinzel, F. K. and Sokolovsky, K. V. and D’Ammando, F. and Burnett, T. H. and Max-Moerbeck, W. and Cheung, C. C. and Fegan, S. J. and Casandjian, J. M. and Reyes, L. C. and Villata, M. and Raiteri, C. M. and Agudo, I. and Bravo Calle, O. J. A. and Carosati, D. and Casas, R. and Gómez, J. L. and Gurwell, M. A. and Hsiao, H. Y. and Jorstad, S. G. and Kimeridze, G. and Konstantinova, T. S. and Kopatskaya, E. N. and Koptelova, E. and Kurtanidze, O. M. and Kurtanidze, S. O. and Larionov, V. M. and Larionova, E. G. and Larionova, L. V. and Marscher, A. P. and Morozova, D. A. and Nikolashvili, M. G. and Roca-Sogorb, M. and Ros, J. A. and Sigua, L. A. and Spiridonova, O. and Troitsky, I. S. and Vlasyuk, V. V. and Lobanov, A. P. and Zensus, J. A.},
abstractNote = {For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991–2000), it has remained an open question why the prominent blazar 3C 345 was not reliably detected at γ-ray energies ≥ 20 MeV. Recently a bright γ-ray source (0FGL J1641.4+3939/1FGL J1642.5+3947), potentially associated with 3C 345, was detected by the Large Area Telescope (LAT) on Fermi. Multiwavelength observations from radio bands to X-rays (mainly GASP-WEBT and Swift) of possible counterparts (3C 345, NRAO 512, B3 1640 + 396) were combined with 20 months of Fermi-LAT monitoring data (August 2008 – April 2010) to associate and identify the dominating γ-ray emitting counterpart of 1FGL J1642.5+3947. The source 3C 345 is identified as the main contributor for this γ-ray emitting region. However, after November 2009 (15 months), a significant excess of photons from the nearby quasar NRAO 512 started to contribute and thereafter was detected with increasing γ-ray activity, possibly adding flux to 1FGL J1642.5+3947. As a result, for the same time period and during the summer of 2010, an increase of radio, optical and X-ray activity of NRAO 512 was observed. No γ-ray emission from B3 1640 + 396 was detected.},
doi = {10.1051/0004-6361/201016145},
journal = {Astronomy and Astrophysics},
number = ,
volume = 532,
place = {United States},
year = {2011},
month = {8}
}

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