2012A&A...542A..94H

Query : 2012A&A...542A..94H

2012A&A...542A..94H - Astronomy and Astrophysics, volume 542A, 94-94 (2012/6-1)

Discovery of VHE γ-ray emission and multi-wavelength observations of the BL Lacertae object 1RXS J101015.9-311909.

HESS COLLABORATION, ABRAMOWSKI A., ACERO F., AHARONIAN F., AKHPERJANIAN A.G., ANTON G., BALZER A., BARNACKA A., BECHERINI Y., BECKER J., BERNLOEHR K., BIRSIN E., BITEAU J., BOCHOW A., BOISSON C., BOLMONT J., BORDAS P., BRUCKER J., BRUN F., BRUN P., BULIK T., BUESCHING I., CARRIGAN S., CASANOVA S., CERRUTI M., CHADWICK P.M., CHARBONNIER A., CHAVES R.C.G., CHEESEBROUGH A., COLOGNA G., CONRAD J., DALTON M., DANIEL M.K., DAVIDS I.D., DEGRANGE B., DEIL C., DICKINSON H.J., DJANNATI-ATAIE A., DOMAINKO W., DRURY L.O'C., DUBUS G., DUTSON K., DYKS J., DYRDA M., EGBERTS K., EGER P., ESPIGAT P., FALLON L., FEGAN S., FEINSTEIN F., FERNANDES M.V., FIASSON A., FONTAINE G., FOERSTER A., FUESSLING M., GALLANT Y.A., GAST H., GERARD L., GERBIG D., GIEBELS B., GLICENSTEIN J.F., GLUECK B., GOERING D., HAEFFNER S., HAGUE J.D., HAHN J., HAMPF D., HARRIS J., HAUSER M., HEINZ S., HEINZELMANN G., HENRI G., HERMANN G., HILLERT A., HINTON J.A., HOFMANN W., HOFVERBERG P., HOLLER M., HORNS D., JACHOLKOWSKA A., DE JAGER O.C., JAHN C., JAMROZY M., JUNG I., KASTENDIECK M.A., KATARZYNSKI K., KATZ U., KAUFMANN S., KEOGH D., KHELIFI B., KLOCHKOV D., KLUZNIAK W., KNEISKE T., KOMIN NU., KOSACK K., KOSSAKOWSKI R., KRAYZEL F., LAFFON H., LAMANNA G., LENAIN J.-P., LENNARZ D., LOHSE T., LOPATIN A., LU C.-C., MARANDON V., MARCOWITH A., MASBOU J., MAXTED N., MAYER M., McCOMB T.J.L., MEDINA M.C., MEHAULT J., MODERSKI R., MOHAMED M., MOULIN E., NAUMANN C.L., NAUMANN-GODO M., DE NAUROIS M., NEDBAL D., NEKRASSOV D., NGUYEN N., NICHOLAS B., NIEMIEC J., NOLAN S.J., OHM S., DE ONA WILHELMI E., OPITZ B., OSTROWSKI M., OYA I., PANTER M., PAZ ARRIBAS M., PEKEUR N.W., PELLETIER G., PEREZ J., PETRUCCI P.-O., PEYAUD B., PITA S., PUEHLHOFER G., PUNCH M., QUIRRENBACH A., RAUE M., RAYNER S.M., REIMER A., REIMER O., RENAUD M., DE LOS REYES R., RIEGER F., RIPKEN J., ROB L., ROSIER-LEES S., ROWELL G., RUDAK B., RULTEN C.B., SAHAKIAN V., SANCHEZ D.A., SANTANGELO A., SCHLICKEISER R., SCHULZ A., SCHWANKE U., SCHWARZBURG S., SCHWEMMER S., SHEIDAEI F., SKILTON J.L., SOL H., SPENGLER G., STAWARZ L., STEENKAMP R., STEGMANN C., STINZING F., STYCZ K., SUSHCH I., SZOSTEK A., TAVERNET J.-P., TERRIER R., TLUCZYKONT M., VALERIUS K., VAN ELDIK C., VASILEIADIS G., VENTER C., VIANA A., VINCENT P., VOELK H.J., VOLPE F., VOROBIOV S., VORSTER M., WAGNER S.J., WARD M., WHITE R., WIERZCHOLSKA A., ZACHARIAS M., ZAJCZYK A., ZDZIARSKI A.A., ZECH A. and ZECHLIN H.-S.

Abstract (from CDS):

1RXSJ101015.9-311909 is a galaxy located at a redshift of z=0.14 hosting an active nucleus (called AGN) belonging to the class of bright BL Lac objects. Observations at high (HE, E>100MeV) and very high (VHE, E>100GeV) energies provide insights into the origin of very energetic particles present in such sources and the radiation processes at work. We report on results from VHE observations performed between 2006 and 2010 with the H.E.S.S. instrument, an array of four imaging atmospheric Cherenkov telescopes. H.E.S.S. data have been analysed with enhanced analysis methods, making the detection of faint sources more significant. VHE emission at a position coincident with 1RXSJ101015.9-311909 is detected with H.E.S.S. for the first time. In a total good-quality livetime of about 49h, we measure 263 excess counts, corresponding to a significance of 7.1 standard deviations. The photon spectrum above 0.2TeV can be described by a power-law with a photon index of Γ=3.08±0.42_stat±0.20_sys. The integral flux above 0.2 TeV is about 0.8% of the flux of the Crab nebula and shows no significant variability over the time reported. In addition, public Fermi/LAT data are analysed to search for high energy emission from the source. The Fermi/LAT HE emission in the 100 MeV to 200GeV energy range is significant at 8.3 standard deviations in the chosen 25-month dataset. UV and X-ray contemporaneous observations with the Swift satellite in May 2007 are also reported, together with optical observations performed with the atom telescope located at the H.E.S.S. site. Swift observations reveal an absorbed X-ray flux of F_(0.3–7)keV=1.04^+0.04_–0.05x10^–11erg/cm2/s in the 0.3-7keV range. Finally, all the available data are used to study the multi-wavelength properties of the source. The spectral energy distribution (SED) can be reproduced using a simple one-zone Synchrotron Self Compton (SSC) model with emission from a region with a Doppler factor of 30 and a magnetic field between 0.025 and 0.16G. These parameters are similar to those obtained for other sources of this type.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: galaxies - galaxies: active - BL Lacertae objects: individual: 1RXS J101015.9-311909

VizieR on-line data: <Available at CDS (J/A+A/542/A94): hesssp.dat fermisp.dat swiftca.dat swiftcb.dat hesslc.dat fermilc1.dat fermilc2.dat atomlc1.dat atomlc2.dat>

Simbad objects: 2

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Number of rows : 2

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						~	6120	1
2	6dFGS gJ101016.0-311909	BLL	10 10 15.9790879224	-31 19 08.411407176		17.61		16.09		~	78	0

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