FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87
- Abdo AA
- Ackermann M
- Ajello M
- Atwood WB
- Axelsson M
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- Barbiellini G
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- Finke J
- Focke WB
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- Frailis M
- Fukazawa Y
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- Fusco P
- Gargano F
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- Hayashida M
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- Johnson AS
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- Lande J
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- Lemoine-Goumard M
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- Monzani ME
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- Moskalenko IV
- Murgia S
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- Norris JP
- Nuss E
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- Panetta JH
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- Pesce-Rollins M
- Piron F
- Porter TA
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- Rando R
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- Reposeur T
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- Shaw MS
- Smith DA
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- Strickman MS
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DOIAbstract
We report the Fermi Large Area Telescope (LAT) discovery of high-energy (MeV/GeV) γ-ray emission positionally consistent with the center of the radio galaxy M87, at a source significance of over 10σ 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 γ-ray source has a >100 MeV flux of 2.45 (±0.63) × 10–8 photons cm–2 s–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 × 10–8 photons cm–2 s–1, 2σ), thus there is no evidence for a significant MeV/GeV flare on decade timescales. Contemporaneous Chandra and Very Long Basel...
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