2008ApJ...685L..23A

Query : 2008ApJ...685L..23A

2008ApJ...685L..23A - Astrophys. J., 685, L23-L26 (2008/September-3)

Very high energy gamma-ray observations of strong flaring activity in M87 in 2008 February.

ALBERT J., ALIU E., ANDERHUB H., ANTONELLI L.A., ANTORANZ P., BACKES M., BAIXERAS C., BARRIO J.A., BARTKO H., BASTIERI D., BECKER J.K., BEDNAREK W., BERGER K., BERNARDINI E., BIGONGIARI C., BILAND A., BOCK R.K., BONNOLI G., BORDAS P., BOSCH-RAMON V., BRETZ T., BRITVITCH I., CAMARA M., CARMONA E., CHILINGARIAN A., COMMICHAU S., CONTRERAS J.L., CORTINA J., COSTADO M.T., COVINO S., CURTEF V., DAZZI F., DE ANGELIS A., DE CEA DEL POZO E., DE LOS REYES R., DE LOTTO B., DE MARIA M., DE SABATA F., DELGADO MENDEZ C., DOMINGUEZ A., DORNER D., DORO M., ERRANDO M., FAGIOLINI M., FERENC D., FERNANDEZ E., FIRPO R., FONSECA M.V., FONT L., GALANTE N., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GOEBEL F., HAYASHIDA M., HERRERO A., HOHNE D., HOSE J., HSU C.C., HUBER S., JOGLER T., KRANICH D., LA BARBERA A., LAILLE A., LEONARDO E., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., LORENZ E., MAJUMDAR P., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MAZIN D., MEUCCI M., MEYER M., MIRANDA J.M., MIRZOYAN R., MIZOBUCHI S., MOLES M., MORALEJO A., NIETO D., NILSSON K., NINKOVIC J., OTTE N., OYA I., PANNIELLO M., PAOLETTI R., PAREDES J.M., PASANEN M., PASCOLI D., PAUSS F., PEGNA R.G., PEREZ-TORRES M.A., PERSIC M., PERUZZO L., PICCIOLI A., PRADA F., PRANDINI E., PUCHADES N., RAYMERS A., RHODE W., RIBO M., RICO J., RISSI M., ROBERT A., RUGAMER S., SAGGION A., SAITO T.Y., SALVATI M., SANCHEZ-CONDE M., SARTORI P., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHWEIZER T., SHAYDUK M., SHINOZAKI K., SHORE S.N., SIDRO N., SIERPOWSKA-BARTOSIK A., SILLANPAA A., SOBCZYNSKA D., SPANIER F., STAMERRA A., STARK L.S., TAKALO L., TAVECCHIO F., TEMNIKOV P., TESCARO D., TESHIMA M., TLUCZYKONT M., TORRES D.F., TURINI N., VANKOV H., VENTURINI A., VITALE V., WAGNER R.M., WITTEK W., ZABALZA V., ZANDANEL F., ZANIN R. and ZAPATERO J.

Abstract (from CDS):

M87 is the only known nonblazar radio galaxy to emit very high energy (VHE) gamma rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable above 350 GeV on a timescale as short as 1 day at a significance level of 5.6 σ. The highest measured flux reached 15% of the Crab Nebula flux. We observed several substantial changes of the flux level during the 13 day observing period. The flux at lower energies (150-350 GeV), instead, is compatible with being constant. The energy spectrum can be described by a power law with a photon index of 2.30±0.11stat± 0.20syst. The observed day-scale flux variability at VHE prefers the M87 core as source of the emission and implies that either the emission region is very compact (just a few Schwarzschild radii) or the Doppler factor of the emitting blob is rather large in the case of a nonexpanding emission region.

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Journal keyword(s): Galaxies: Active - Galaxies: Individual: Messier Number: M87 - Galaxies: Individual: NGC Number: NGC 4486 - Gamma Rays: Observations

Simbad objects: 4

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Number of rows : 4
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
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

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