2012ApJ...754L..10A

Query : 2012ApJ...754L..10A

2012ApJ...754L..10A - Astrophys. J., 754, L10 (2012/July-3)

Detection of VHE γ-rays from HESS J0632+057 during the 2011 February X-ray outburst with the MAGIC telescopes.

ALEKSIC J., ALVAREZ E.A., ANTONELLI L.A., ANTORANZ P., ASENSIO M., BACKES M., BARRES DE ALMEIDA U., BARRIO J.A., BASTIERI D., BECERRA GONZALEZ J., BEDNAREK W., BERGER K., BERNARDINI E., BILAND A., BLANCH O., BOCK R.K., BOLLER A., BONNOLI G., BORLA TRIDON D., BOSCH-RAMON V., BRETZ T., CANELLAS A., CARMONA E., CAROSI A., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COSSIO L., COVINO S., DA VELA P., DAZZI F., DE ANGELIS A., DE CANEVA G., DE CEA DEL POZO E., DE LOTTO B., DELGADO MENDEZ C., DIAGO ORTEGA A., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EISENACHER D., ELSAESSER D., FERENC D., FONSECA M.V., FONT L., FRUCK C., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GIAVITTO G., GODINOVIC N., GONZALEZ MUNOZ A., GOZZINI S.R., HADASCH D., HAFNER D., HERRERO A., HILDEBRAND D., HOSE J., HRUPEC D., HUBER B., JANKOWSKI F., JOGLER T., KADENIUS V., KELLERMANN H., KLEPSER S., KRAHENBUHL T., KRAUSE J., LA BARBERA A., LELAS D., LEONARDO E., LEWANDOWSKA N., LINDFORS E., LOMBARDI S., LOPEZ M., LOPEZ-COTO R., LOPEZ-ORAMAS A., LORENZ E., MAKARIEV M., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MAZIN D., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MOLDON J., MORALEJO A., MUNAR-ADROVER P., NIEDZWIECKI A., NIETO D., NILSSON K., NOWAK N., ORITO R., PAIANO S., PANEQUE D., PAOLETTI R., PARDO S., PAREDES J.M., PARTINI S., PEREZ-TORRES M.A., PERSIC M., PILIA M., POCHON J., PRADA F., PRADA MORONI P.G., PRANDINI E., PUERTO GIMENEZ I., PULJAK I., REICHARDT I., REINTHAL R., RHODE W., RIBO M., RICO J., RUGAMER S., SAGGION A., SAITO K., SAITO T.Y., SALVATI M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHORE S.N., SILLANPAA A., SITAREK J., SNIDARIC I., SOBCZYNSKA D., SPANIER F., SPIRO S., STAMATESCU V., STAMERRA A., STEINKE B., STORZ J., STRAH N., SUN S., SURIC T., TAKALO L., TAKAMI H., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., TIBOLLA O., TORRES D.F., TREVES A., UELLENBECK M., VOGLER P., WAGNER R.M., WEITZEL Q., ZABALZA V., ZANDANEL F. and ZANIN R.

Abstract (from CDS):

The very high energy (VHE) γ-ray source HESS J0632+057 has recently been confirmed to be a γ-ray binary. The optical counterpart is the Be star MWC 148, and a compact object of unknown nature orbits it every ∼321 days with a high eccentricity of ∼0.8. We monitored HESS J0632+057 with the stereoscopic MAGIC telescopes from 2010 October to 2011 March and detected significant VHE γ-ray emission during 2011 February, when the system exhibited an X-ray outburst. We find no γ-ray signal in the other observation periods when the system did not show increased X-ray flux. Thus, HESS J0632+057 exhibits γ-ray variability on timescales of the order of one to two months possibly linked to the X-ray outburst that takes place about 100 days after the periastron passage. Furthermore, our measurements provide for the first time the γ-ray spectrum down to about 140 GeV and indicate no turnover of the spectrum at low energies. We compare the properties of HESS J0632+057 with the similar γ-ray binary LS I +61°303 and discuss the possible origin of the multi-wavelength emission of the source.

Abstract Copyright: ∼

Journal keyword(s): binaries: general - gamma rays: general - stars: individual: MWC 148 - X-rays: binaries - X-rays: individual: HESS J0632+057

Simbad objects: 5

Full paper

View the references in ADS

Number of rows : 5

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	LS I +61 303	HXB	02 40 31.6644419688	+61 13 45.593918580	11.27	11.61	10.75	10.19	9.55	B0Ve	853	2
2	M 1	SNR	05 34 30.9	+22 00 53						~	6193	1
3	HD 259440	HXB	06 32 59.2566076656	+05 48 01.160755848	9.17	9.63	9.15			B0pe	221	0
4	CPD-63 2495	HXB	13 02 47.6544015048	-63 50 08.626970292	10.34	10.72	9.98	10.03		O9.5Ve	793	0
5	V* V479 Sct	HXB	18 26 15.0561548880	-14 50 54.247274304	12.02	12.23	11.27	11.04		ON6V((f))z	572	2

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