2008ApJ...679..397A

Query : 2008ApJ...679..397A

2008ApJ...679..397A - Astrophys. J., 679, 397-403 (2008/May-3)

Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS.

ACCIARI V.A., BEILICKE M., BLAYLOCK G., BRADBURY S.M., BUCKLEY J.H., BUGAEV V., BUTT Y., CELIK O., CESARINI A., CIUPIK L., COGAN P., COLIN P., CUI W., DANIEL M.K., DUKE C., ERGIN T., FALCONE A.D., FEGAN S.J., FINLEY J.P., FINNEGAN G., FORTIN P., FORTSON L.F., GIBBS K., GILLANDERS G.H., GRUBE J., GUENETTE R., GYUK G., HANNA D., HAYS E., HOLDER J., HORAN D., HUGHES S.B., HUI M.C., HUMENSKY T.B., IMRAN A., KAARET P., KERTZMAN M., KIEDA D.B., KILDEA J., KONOPELKO A., KRAWCZYNSKI H., KRENNRICH F., LANG M.J., LEBOHEC S., LEE K., MAIER G., McCANN A., McCUTCHEON M., MILLIS J., MORIARTY P., MUKHERJEE R., NAGAI T., ONG R.A., PANDEL D., PERKINS J.S., POHL M., QUINN J., RAGAN K., REYNOLDS P.T., ROSE H.J., SCHROEDTER M., SEMBROSKI G.H., SMITH A.W., STEELE D., SWORDY S.P., SYSON A., TONER J.A., VALCARCEL L., VASSILIEV V.V., WAKELY S.P., WARD J.E., WEEKES T.C., WEINSTEIN A., WHITE R.J., WILLIAMS D.A., WISSEL S.A., WOOD M.D. and ZITZER B.

Abstract (from CDS):

The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV γ-rays. Here we report the detection of γ-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The γ-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5'. The differential energy spectrum is fitted well by a power-law function: dΦ/dE=(7.4±1.3stat±1.5sys)(E/TeV)(–2.31±0.17stat±0.2sys_)10-9^/m2/s/TeV. We show strong evidence for a year-scale correlation between the γ-ray flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the γ-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.

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Journal keyword(s): Galaxies: Individual: Messier Number: M87 - Galaxies: Individual: NGC Number: NGC 4486 - galaxies: individual (Virgo A) - Gamma Rays: Observations

Nomenclature: Text: VER JHHMM+DDd N=1.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 1 SNR 05 34 30.9 +22 00 53           ~ 6193 1
2 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2675 1
3 NGC 4371 GiG 12 24 55.4333579760 +11 42 15.144247584 12.35 11.79 10.81     ~ 319 1
4 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1764 2
5 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1341 2
6 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1084 1
7 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6647 0
8 NGC 4429 GiG 12 27 26.5040002440 +11 06 27.588767616   11.4       ~ 318 0
9 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 445 2
10 NGC 4438 LIN 12 27 45.6705493536 +13 00 31.708096380 11.37 11.02 10.17     ~ 637 2
11 NGC 4461 GiP 12 29 03.010 +13 11 01.88 12.56 12.09 11.19     ~ 236 2
12 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 645 1
13 NGC 4477 Sy2 12 30 02.1955766304 +13 38 11.543715888 11.98 11.38 10.42     ~ 396 2
14 NAME Knot in M87 Jet PoG 12 30 49.355 +12 23 28.32           ~ 204 0
15 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7197 3
16 NGC 4503 GiP 12 32 06.2324986032 +11 10 34.960071396 12.66 12.05 11.07     ~ 215 1
17 NGC 4531 GiG 12 34 15.8672289240 +13 04 31.092418884   12.42       ~ 146 1
18 NGC 4550 GiP 12 35 30.5913588048 +12 13 14.921166792 12.97 12.56 11.68     ~ 537 1
19 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 995 2
20 NGC 4564 GiG 12 36 26.9869512504 +11 26 21.204472848 12.51 12.05 11.12     ~ 595 1
21 7C 165211.80+395026.00 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2162 2

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