SIMBAD references

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±1.3_stat±1.5_sys)(E/TeV)^{(–2.31±0.17}stat_±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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