2015MNRAS.451..739A

Query : 2015MNRAS.451..739A

2015MNRAS.451..739A - Mon. Not. R. Astron. Soc., 451, 739-750 (2015/July-3)

MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524.

ALEKSIC J., ANSOLDI S., ANTONELLI L.A., ANTORANZ P., BABIC A., BANGALE P., BARRIO J.A., BECERRA GONZALEZ J., BEDNAREK W., BERNARDINI E., BIASUZZI B., BILAND A., BLANCH O., BONNEFOY S., BONNOLI G., BORRACCI F., BRETZ T., CARMONA E., CAROSI A., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COVINO S., DA VELA P., DAZZI F., DE ANGELIS A., DE CANEVA G., DE LOTTO B., DE ONA WILHELMI E., DELGADO MENDEZ C., DI PIERRO F., DOMINIS PRESTER D., DORNER D., DORO M., EINECKE S., EISENACHER D., ELSAESSER D., FERNANDEZ-BARRAL A., FIDALGO D., FONSECA M.V., FONT L., FRANTZEN K., FRUCK C., GALINDO D., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GAUG M., GODINOVIC N., GONZALEZ MUNOZ A., GOZZINI S.R., HADASCH D., HANABATA Y., HAYASHIDA M., HERRERA J., HOSE J., HRUPEC D., IDEC W., KADENIUS V., KELLERMANN H., KNOETIG M.L., KODANI K., KONNO Y., KRAUSE J., KUBO H., KUSHIDA J., LA BARBERA A., LELAS D., LEWANDOWSKA N., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., LOPEZ-COTO R., LOPEZ-ORAMAS A., LORENZ E., LOZANO I., MAKARIEV M., MALLOT K., MANEVA G., MANNHEIM K., MARASCHI L., MARCOTE B., MARIOTTI M., MARTINEZ M., MAZIN D., MENZEL U., MIRANDA J.M., MIRZOYAN R., MORALEJO A., MUNAR-ADROVER P., NAKAJIMA D., NEUSTROEV V., NIEDZWIECKI A., NIEVAS ROSILLO M., NILSSON K., NISHIJIMA K., NODA K., ORITO R., OVERKEMPING A., PAIANO S., PALATIELLO M., PANEQUE D., PAOLETTI R., PAREDES J.M., PAREDES-FORTUNY X., PERSIC M., POUTANEN J., PRADA MORONI P.G., PRANDINI E., PULJAK I., REINTHAL R., RHODE W., RIBO M., RICO J., RODRIGUEZ GARCIA J., SAITO T., SAITO K., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHORE S.N., SILLANPAA A., SITAREK J., SNIDARIC I., SOBCZYNSKA D., STAMERRA A., STEINBRING T., STRZYS M., TAKALO L., TAKAMI H., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., THAELE J., TORRES D.F., TOYAMA T., TREVES A., VOGLER P., WILL M., ZANIN R., BERGER K., BUSON S., D'AMMANDO F., GASPARRINI D., HOVATTA T., MAX-MOERBECK W., READHEAD A. and RICHARDS J.

Abstract (from CDS):

The high-frequency-peaked BL Lac (HBL) 1ES 0806+524 (z = 0.138) was discovered in very high energy (VHE) γ-rays in 2008. Until now, the broad-band spectrum of 1ES 0806+524 has been only poorly characterized, in particular at high energies. We analysed multiwavelength observations from γ-rays to radio performed from 2011 January to March, which were triggered by the high activity detected at optical frequencies. These observations constitute the most precise determination of the broad-band emission of 1ES 0806+524 to date. The stereoscopic Major Atmospheric Gamma-Ray Imaging Cherenkov (MAGIC) observations yielded a γ-ray signal above 250 GeV of (3.7±0.7) per cent of the Crab Nebula flux with a statistical significance of 9.9σ. The multiwavelength observations showed significant variability in essentially all energy bands, including a VHE γ-ray flare that lasted less than one night, which provided unprecedented evidence for short-term variability in 1ES 0806+524. The spectrum of this flare is well described by a power law with a photon index of 2.97±0.29 between ∼ 150 GeV and 1 TeV and an integral flux of (9.3±1.9) per cent of the Crab nebula flux above 250 GeV. The spectrum during the non-flaring VHE activity is compatible with the only available VHE observation performed in 2008 with VERITAS when the source was in a low optical state. The broad-band spectral energy distribution can be described with a one-zone synchrotron self-Compton model with parameters typical for HBLs, indicating that 1ES 0806+524 is not substantially different from the HBLs previously detected.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - BL Lacertae objects: individual: 1ES 0806+524 - galaxies: jets - gamma rays: galaxies

Simbad objects: 3

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Number of rows : 3
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 RX J0809.8+5218 BLL 08 09 49.1868285744 +52 18 58.249938744   16.11 15.59 14.6   ~ 302 1
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2

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