2009ApJ...707...55A

Query : 2009ApJ...707...55A

2009ApJ...707...55A - Astrophys. J., 707, 55-60 (2009/December-2)

Fermi Large Area Telescope gamma-ray detection of the radio galaxy M87.

ABDO A.A., ACKERMANN M., AJELLO M., ATWOOD W.B., AXELSSON M., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BECHTOL K., BELLAZZINI R., BERENJI B., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BURNETT T.H., CALIANDRO G.A., CAMERON R.A., CANNON A., CARAVEO P.A., CASANDJIAN J.M., CAVAZZUTI E., CECCHI C., CELIK O., CHARLES E., CHEUNG C.C., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., COLAFRANCESCO S., CONRAD J., COSTAMANTE L., CUTINI S., DAVIS D.S., DERMER C.D., DE ANGELIS A., DE PALMA F., DIGEL S.W., DONATO D., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., EDMONDS Y., FARNIER C., FAVUZZI C., FEGAN S.J., FINKE J., FOCKE W.B., FORTIN P., FRAILIS M., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GEORGANOPOULOS M., GERMANI S., GIEBELS B., GIGLIETTO N., GIOMMI P., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GRENIER I.A., GRONDIN M.-H., GROVE J.E., GUILLEMOT L., GUIRIEC S., HANABATA Y., HARDING A.K., HAYASHIDA M., HAYS E., HORAN D., JOHANNESSON G., JOHNSON A.S., JOHNSON R.P., JOHNSON T.J., JOHNSON W.N., KAMAE T., KATAGIRI H., KATAOKA J., KAWAI N., KERR M., KNODLSEDER J., KOCIAN M.L., KUSS M., LANDE J., LATRONICO L., LEMOINE-GOUMARD M., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAKEEV A., MAZZIOTTA M.N., McCONVILLE W., McENERY J.E., MEURER C., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NOLAN P.L., NORRIS J.P., NUSS E., OHSUGI T., OMODEI N., ORLANDO E., ORMES J.F., OZAKI M., PANEQUE D., PANETTA J.H., PARENT D., PELASSA V., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., RAINO S., RANDO R., RAZZANO M., REIMER A., REIMER O., REPOSEUR T., RITZ S., ROCHESTER L.S., RODRIGUEZ A.Y., ROMANI R.W., ROTH M., RYDE F., SADROZINSKI H.F.-W., SAMBRUNA R., SANCHEZ D., SANDER A., SAZ PARKINSON P.M., SCARGLE J.D., SGRO C., SHAW M.S., SMITH D.A., SMITH P.D., SPANDRE G., SPINELLI P., STRICKMAN M.S., SUSON D.J., TAJIMA H., TAKAHASHI H., TANAKA T., TAYLOR G.B., THAYER J.B., THOMPSON D.J., TIBALDO L., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VASILEIOU V., VILCHEZ N., WAITE A.P., WANG P., WINER B.L., WOOD K.S., YLINEN T., ZIEGLER M., HARRIS D.E., MASSARO F. and STAWARZ L.

Abstract (from CDS):

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)x10^–8 photons/cm2/s (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 (<2.18x10^–8 photons/cm2/s, 2σ), 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 γ-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.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: individual: M87 - galaxies: jets - gamma rays: observations - radiation mechanisms: non-thermal

Simbad objects: 6

Full paper

View the references in ADS

Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 1275	Bla	03 19 48.1599902040	+41 30 42.108850836		13.10	12.48	11.09		~	4243	3
2	3C 111	Sy1	04 18 21.2772425736	+38 01 35.801359968		19.75	18.05			~	1002	2
3	NAME Knot in M87 Jet	PoG	12 30 49.355	+12 23 28.32						~	233	0
4	M 87	AGN	12 30 49.42338414	+12 23 28.0436859	10.16	9.59	8.63		7.49	~	7815	3
5	NAME Centaurus A	BLL	13 25 27.61521044	-43 01 08.8050291		8.18	6.84	6.66		~	4774	3
6	NGC 6251	Bla	16 32 31.96989253	+82 32 16.3999044	15.24	14.66	12.89	7.62		~	772	1

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