Fermi Large Area Telescope Gamma-Ray Detection of the Radio Galaxy M87

Details Fermi Large Area Telescope Gamma-Ray Detection of the Radio Galaxy M87 Fermi Large Area Telescope Gamma-Ray Detection of the Radio Galaxy M87

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541136m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #411.36; Bulletin of the American Astronomical Society, Vol. 36, p.1112

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the high-energy (MeV-GeV) gamma-ray detection of the radio galaxy M87 with the Fermi Large Area Telescope (LAT). The detection of M87 marks the third radio galaxy seen by Fermi in addition to Cen A and Per A. The point-like source, which reached a significance of >10 sigma after 10 months of all-sky survey data, is positionally consistent with the center of M87. Spectral analysis of the source resulted in a >100 MeV flux of 2.5 * 10-8 ph cm-2 s-1, and a photon index of 2.3. Thus no significant flaring of the source is observed on decade timescales when compared to the previous 2 sigma EGRET upper limit of < 2.18 * 10-8 ph*cm-2*s-1. Ten-day light curves using the Fermi data reveal no significant gamma-ray variability over the duration of the LAT observation. Comparison of contemporaneous Chandra and VLBA observations with previous measurements indicate that the source was in a quiescent state during this time. The broadband SED, which uses both the contemporaneous VLBA and Chandra observations, is fit with a one-zone synchrotron self-Compton jet model from the electron population producing the radio to x-ray emission in the sub-pc scale core.

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