FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87
Abstract
We report the Fermi Large Area Telescope (LAT) discovery of high-energy (MeV/GeV) gamma-ray emission positionally consistent with the center of the radio galaxy M87, at a source significance of over 10sigma in 10 months of all-sky survey data. Following the detections of Cen A and Per A, this makes M87 the third radio galaxy seen with the LAT. The faint point-like gamma-ray source has a >100 MeV flux of 2.45 (+-0.63) x 10{sup -8} photons cm{sup -2} s{sup -1} (photon index = 2.26 +- 0.13) with no significant variability detected within the LAT observation. This flux is comparable with the previous EGRET upper limit (<2.18 x 10{sup -8} photons cm{sup -2} s{sup -1}, 2sigma), thus there is no evidence for a significant MeV/GeV flare on decade timescales. Contemporaneous Chandra and Very Long Baseline Array data indicate low activity in the unresolved X-ray and radio core relative to previous observations, suggesting M87 is in a quiescent overall level over the first year of Fermi-LAT observations. The LAT gamma-ray spectrum is modeled as synchrotron self-Compton (SSC) emission from the electron population producing the radio-to-X-ray emission in the core. The resultant SSC spectrum extrapolates smoothly from the LAT band to the historical-minimum TeVmore »
- Authors:
-
- Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
- W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
- Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)
- Department of Astronomy, Stockholm University, SE-106 91 Stockholm (Sweden)
- Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
- Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France)
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
- Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)
- Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy)
- Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France)
- Publication Date:
- OSTI Identifier:
- 21389341
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 707; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/707/1/55; Journal ID: ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ELECTRONS; EMISSION; GAMMA DETECTION; GAMMA RADIATION; GAMMA SOURCES; GAMMA SPECTRA; GEV RANGE; MEV RANGE; PHOTONS; RADIO GALAXIES; TELESCOPES; TEV RANGE; BOSONS; COSMIC RADIO SOURCES; DETECTION; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GALAXIES; IONIZING RADIATIONS; LEPTONS; MASSLESS PARTICLES; RADIATION DETECTION; RADIATION SOURCES; RADIATIONS; SPECTRA
Citation Formats
Abdo, A A, Ackermann, M, Ajello, M, Bechtol, K, Berenji, B, Blandford, R D, Bloom, E D, Borgland, A W, Atwood, W B, Axelsson, M, Baldini, L, Bellazzini, R, Bregeon, J, Brez, A, Ballet, J, Barbiellini, G, Bastieri, D, Bonamente, E, Brigida, M, and Bruel, P. FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87. United States: N. p., 2009.
Web. doi:10.1088/0004-637X/707/1/55.
Abdo, A A, Ackermann, M, Ajello, M, Bechtol, K, Berenji, B, Blandford, R D, Bloom, E D, Borgland, A W, Atwood, W B, Axelsson, M, Baldini, L, Bellazzini, R, Bregeon, J, Brez, A, Ballet, J, Barbiellini, G, Bastieri, D, Bonamente, E, Brigida, M, & Bruel, P. FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87. United States. https://doi.org/10.1088/0004-637X/707/1/55
Abdo, A A, Ackermann, M, Ajello, M, Bechtol, K, Berenji, B, Blandford, R D, Bloom, E D, Borgland, A W, Atwood, W B, Axelsson, M, Baldini, L, Bellazzini, R, Bregeon, J, Brez, A, Ballet, J, Barbiellini, G, Bastieri, D, Bonamente, E, Brigida, M, and Bruel, P. 2009.
"FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87". United States. https://doi.org/10.1088/0004-637X/707/1/55.
@article{osti_21389341,
title = {FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87},
author = {Abdo, A A and Ackermann, M and Ajello, M and Bechtol, K and Berenji, B and Blandford, R D and Bloom, E D and Borgland, A W and Atwood, W B and Axelsson, M and Baldini, L and Bellazzini, R and Bregeon, J and Brez, A and Ballet, J and Barbiellini, G and Bastieri, D and Bonamente, E and Brigida, M and Bruel, P},
abstractNote = {We report the Fermi Large Area Telescope (LAT) discovery of high-energy (MeV/GeV) gamma-ray emission positionally consistent with the center of the radio galaxy M87, at a source significance of over 10sigma in 10 months of all-sky survey data. Following the detections of Cen A and Per A, this makes M87 the third radio galaxy seen with the LAT. The faint point-like gamma-ray source has a >100 MeV flux of 2.45 (+-0.63) x 10{sup -8} photons cm{sup -2} s{sup -1} (photon index = 2.26 +- 0.13) with no significant variability detected within the LAT observation. This flux is comparable with the previous EGRET upper limit (<2.18 x 10{sup -8} photons cm{sup -2} s{sup -1}, 2sigma), thus there is no evidence for a significant MeV/GeV flare on decade timescales. Contemporaneous Chandra and Very Long Baseline Array data indicate low activity in the unresolved X-ray and radio core relative to previous observations, suggesting M87 is in a quiescent overall level over the first year of Fermi-LAT observations. The LAT gamma-ray spectrum is modeled as synchrotron self-Compton (SSC) emission from the electron population producing the radio-to-X-ray emission in the core. The resultant SSC spectrum extrapolates smoothly from the LAT band to the historical-minimum TeV emission. Alternative models for the core and possible contributions from the kiloparsec-scale jet in M87 are considered, and cannot be excluded.},
doi = {10.1088/0004-637X/707/1/55},
url = {https://www.osti.gov/biblio/21389341},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 707,
place = {United States},
year = {Thu Dec 10 00:00:00 EST 2009},
month = {Thu Dec 10 00:00:00 EST 2009}
}
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