2011A&A...530A...4A

Query : 2011A&A...530A...4A

2011A&A...530A...4A - Astronomy and Astrophysics, volume 530A, 4-4 (2011/6-1)

MAGIC observations and multiwavelength properties of the quasar 3C 279 in 2007 and 2009.

ALEKSIC J., ANTONELLI L.A., ANTORANZ P., BACKES M., BARRIO J.A., BASTIERI D., BECERRA GONZALEZ J., BEDNAREK W., BERDYUGIN A., BERGER K., BERNARDINI E., BILAND A., BLANCH O., BOCK R.K., BOLLER A., BONNOLI G., BORLA TRIDON D., BRAUN I., BRETZ T., CANELLAS A., CARMONA E., CAROSI A., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COSSIO L., COVINO S., DAZZI F., DE ANGELIS A., 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., ELSAESSER D., FERENC D., FONSECA M.V., FONT L., FRUCK C., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO D., GIAVITTO G., GODINOVIC N., HADASCH D., HAFNER D., HERRERO A., HILDEBRAND D., HOSE J., HRUPEC D., HUBER B., JOGLER T., KLEPSER S., KRAEHENBUEHL T., KRAUSE J., LA BARBERA A., LELAS D., LEONARDO E., LINDFORS E., LOMBARDI S., LOPEZ M., LORENZ E., MAJUMDAR P., MAKARIEV M., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MAZIN D., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MIYAMOTO H., MOLDON J., MORALEJO A., NIETO D., NILSSON K., ORITO R., OYA I., PAOLETTI R., PARDO S., PAREDES J.M., PARTINI S., PASANEN M., PAUSS F., PEREZ-TORRES M.A., PERSIC M., PERUZZO L., PILIA M., POCHON J., PRADA F., PRADA MORONI P.G., PRANDINI E., PULJAK I., REICHARDT I., REINTHAL R., RHODE W., RIBO M., RICO J., RUEGAMER S., RUEGER M., SAGGION A., SAITO K., SAITO T.Y., SALVATI M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHAYDUK M., SHORE S.N., SILLANPAEAE A., SITAREK J., SOBCZYNSKA D., SPANIER F., SPIRO S., STAMERRA A., STEINKE B., STORZ J., STRAH N., SURIC T., TAKALO L., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., THOM M., TIBOLLA O., TORRES D.F., TREVES A., VANKOV H., VOGLER P., WAGNER R.M., WEITZEL Q., ZABALZA V., ZANDANEL F. and ZANIN R.

Abstract (from CDS):

3C 279, the first quasar discovered to emit VHE γ-rays by the MAGIC telescope in 2006, was reobserved by MAGIC in January 2007 during a major optical flare and from December 2008 to April 2009 following an alert from the Fermi space telescope on an exceptionally high γ-ray state. The January 2007 observations resulted in a detection on January 16 with significance 5.4σ, corresponding to a F(>150GeV)(3.8±0.8)x10^–11ph/cm²/s while the overall data sample does not show significant signal. The December 2008-April 2009 observations did not detect the source. We study the multiwavelength behaviour of the source at the epochs of MAGIC observations, collecting quasi-simultaneous data at optical and X-ray frequencies and for 2009 also γ-ray data from Fermi. We study the light curves and spectral energy distribution of the source. The spectral energy distributions of three observing epochs (including the February 2006, which has been previously published) are modelled with one-zone inverse Compton models and the emission on January 16, 2007 also with two zone model and with a lepto-hadronic model. We find that the VHE γ-ray emission detected in 2006 and 2007 challenges standard one-zone model, based on relativistic electrons in a jet scattering broad line region photons, while the other studied models fit the observed spectral energy distribution more satisfactorily.

Abstract Copyright: ∼

Journal keyword(s): quasars: individual: 3C 279 - gamma rays: galaxies

Simbad objects: 3

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Number of rows : 3

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	4C 21.35	Bla	12 24 54.4583146056	+21 22 46.385507388	17.56	17.50	18.2	~	651	2
2	3C 279	Bla	12 56 11.16657958	-05 47 21.5251510	18.01	17.75	15.87	~	2933	2
3	QSO J1512-0906	Bla	15 12 50.53293048	-09 05 59.8297908	16.74	16.54		~	1263	1

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