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Title: Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data

Abstract

We present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10 -3. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. Lastly, the present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi-LAT Collaboration
OSTI Identifier:
1355735
Alternate Identifier(s):
OSTI ID: 1345441
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 9; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Cosmic Ray Electrons; Anisotropy; Pulsar; SNR; Dark Matter

Citation Formats

Abdollahi, S., Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Barbiellini, G., Bellazzini, R., Bissaldi, E., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buson, S., Caragiulo, M., Cavazzuti, E., Chekhtman, A., Ciprini, S., Costanza, F., Cuoco, A., Cutini, S., D’Ammando, F., de Palma, F., Desiante, R., Digel, S. W., Di Lalla, N., Di Mauro, M., Di Venere, L., Donaggio, B., Drell, P. S., Favuzzi, C., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Guiriec, S., Harding, A. K., Jogler, T., Jóhannesson, G., Kamae, T., Kuss, M., Larsson, S., Latronico, L., Li, J., Longo, F., Loparco, F., Lubrano, P., Magill, J. D., Malyshev, D., Manfreda, A., Mazziotta, M. N., Meehan, M., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monzani, M. E., Morselli, A., Negro, M., Nuss, E., Ohsugi, T., Omodei, N., Paneque, D., Perkins, J. S., Pesce-Rollins, M., Piron, F., Pivato, G., Principe, G., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Sgrò, C., Simone, D., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Strong, A. W., Tajima, H., Thayer, J. B., Torres, D. F., Troja, E., Vandenbroucke, J., Zaharijas, G., and Zimmer, S. Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.091103.
Abdollahi, S., Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Barbiellini, G., Bellazzini, R., Bissaldi, E., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buson, S., Caragiulo, M., Cavazzuti, E., Chekhtman, A., Ciprini, S., Costanza, F., Cuoco, A., Cutini, S., D’Ammando, F., de Palma, F., Desiante, R., Digel, S. W., Di Lalla, N., Di Mauro, M., Di Venere, L., Donaggio, B., Drell, P. S., Favuzzi, C., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Guiriec, S., Harding, A. K., Jogler, T., Jóhannesson, G., Kamae, T., Kuss, M., Larsson, S., Latronico, L., Li, J., Longo, F., Loparco, F., Lubrano, P., Magill, J. D., Malyshev, D., Manfreda, A., Mazziotta, M. N., Meehan, M., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monzani, M. E., Morselli, A., Negro, M., Nuss, E., Ohsugi, T., Omodei, N., Paneque, D., Perkins, J. S., Pesce-Rollins, M., Piron, F., Pivato, G., Principe, G., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Sgrò, C., Simone, D., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Strong, A. W., Tajima, H., Thayer, J. B., Torres, D. F., Troja, E., Vandenbroucke, J., Zaharijas, G., & Zimmer, S. Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data. United States. doi:10.1103/PhysRevLett.118.091103.
Abdollahi, S., Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Barbiellini, G., Bellazzini, R., Bissaldi, E., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buson, S., Caragiulo, M., Cavazzuti, E., Chekhtman, A., Ciprini, S., Costanza, F., Cuoco, A., Cutini, S., D’Ammando, F., de Palma, F., Desiante, R., Digel, S. W., Di Lalla, N., Di Mauro, M., Di Venere, L., Donaggio, B., Drell, P. S., Favuzzi, C., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Guiriec, S., Harding, A. K., Jogler, T., Jóhannesson, G., Kamae, T., Kuss, M., Larsson, S., Latronico, L., Li, J., Longo, F., Loparco, F., Lubrano, P., Magill, J. D., Malyshev, D., Manfreda, A., Mazziotta, M. N., Meehan, M., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monzani, M. E., Morselli, A., Negro, M., Nuss, E., Ohsugi, T., Omodei, N., Paneque, D., Perkins, J. S., Pesce-Rollins, M., Piron, F., Pivato, G., Principe, G., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Sgrò, C., Simone, D., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Strong, A. W., Tajima, H., Thayer, J. B., Torres, D. F., Troja, E., Vandenbroucke, J., Zaharijas, G., and Zimmer, S. Wed . "Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data". United States. doi:10.1103/PhysRevLett.118.091103. https://www.osti.gov/servlets/purl/1355735.
@article{osti_1355735,
title = {Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data},
author = {Abdollahi, S. and Ackermann, M. and Ajello, M. and Albert, A. and Atwood, W. B. and Baldini, L. and Barbiellini, G. and Bellazzini, R. and Bissaldi, E. and Bloom, E. D. and Bonino, R. and Bottacini, E. and Brandt, T. J. and Bruel, P. and Buson, S. and Caragiulo, M. and Cavazzuti, E. and Chekhtman, A. and Ciprini, S. and Costanza, F. and Cuoco, A. and Cutini, S. and D’Ammando, F. and de Palma, F. and Desiante, R. and Digel, S. W. and Di Lalla, N. and Di Mauro, M. and Di Venere, L. and Donaggio, B. and Drell, P. S. and Favuzzi, C. and Focke, W. B. and Fukazawa, Y. and Funk, S. and Fusco, P. and Gargano, F. and Gasparrini, D. and Giglietto, N. and Giordano, F. and Giroletti, M. and Green, D. and Guiriec, S. and Harding, A. K. and Jogler, T. and Jóhannesson, G. and Kamae, T. and Kuss, M. and Larsson, S. and Latronico, L. and Li, J. and Longo, F. and Loparco, F. and Lubrano, P. and Magill, J. D. and Malyshev, D. and Manfreda, A. and Mazziotta, M. N. and Meehan, M. and Michelson, P. F. and Mitthumsiri, W. and Mizuno, T. and Moiseev, A. A. and Monzani, M. E. and Morselli, A. and Negro, M. and Nuss, E. and Ohsugi, T. and Omodei, N. and Paneque, D. and Perkins, J. S. and Pesce-Rollins, M. and Piron, F. and Pivato, G. and Principe, G. and Rainò, S. and Rando, R. and Razzano, M. and Reimer, A. and Reimer, O. and Sgrò, C. and Simone, D. and Siskind, E. J. and Spada, F. and Spandre, G. and Spinelli, P. and Strong, A. W. and Tajima, H. and Thayer, J. B. and Torres, D. F. and Troja, E. and Vandenbroucke, J. and Zaharijas, G. and Zimmer, S.},
abstractNote = {We present the Large Area Telescope on board the Fermi Gamma-ray Space Telescope that has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10-3. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. Lastly, the present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.},
doi = {10.1103/PhysRevLett.118.091103},
journal = {Physical Review Letters},
number = 9,
volume = 118,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

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