2014A&A...567A..41A

Query : 2014A&A...567A..41A

2014A&A...567A..41A - Astronomy and Astrophysics, volume 567A41-41 (2014/7-1)

MAGIC observations and multifrequency properties of the flat spectrum radio quasar 3C 279 in 2011.

ALEKSIC J., ANSOLDI S., ANTONELLI L.A., ANTORANZ P., BABIC A., BANGALE P., BARRES DE ALMEIDA U., BARRIO J.A., BECERRA GONZALEZ J., BEDNAREK W., BERGER K., BERNARDINI E., BILAND A., BLANCH O., BOCK R.K., BONNEFOY S., BONNOLI G., BORRACCI F., BRETZ T., CARMONA E., CAROSI A., CARRETO FIDALGO D., 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., DELGADO MENDEZ C., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EINECKE S., EISENACHER D., ELSAESSER D., FARINA E., FERENC D., FONSECA M.V., FONT L., FRANTZEN K., FRUCK C., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GAUG M., GIAVITTO G., GODINOVIC N., GONZALEZ MUNOZ A., GOZZINI S.R., HADASCH D., HERRERO A., HILDEBRAND D., 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., LOPEZ M., LOPEZ-COTO R., LOPEZ-ORAMAS A., LORENZ E., LOZANO I., MAKARIEV M., MALLOT K., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARCOTE B., MARIOTTI M., MARTINEZ M., MAZIN D., MENZEL U., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MORALEJO A., MUNAR-ADROVER P., NAKAJIMA D., NIEDZWIECKI A., NILSSON K., NISHIJIMA K., NOWAK N., ORITO R., OVERKEMPING A., PAIANO S., PALATIELLO M., PANEQUE D., PAOLETTI R., PAREDES J.M., PAREDES-FORTUNY X., PARTINI S., PERSIC M., PRADA F., PRADA MORONI P.G., PRANDINI E., PREZIUSO S., PULJAK I., REINTHAL R., RHODE W., RIBO M., RICO J., RODRIGUEZ GARCIA J., RUEGAMER S., SAGGION A., SAITO T., SAITO K., SALVATI M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHORE S.N., SILLANPAEAE A., SITAREK J., SNIDARIC I., SOBCZYNSKA D., SPANIER F., STAMATESCU V., STAMERRA A., STEINBRING T., STORZ J., SUN S., SURIC T., TAKALO L., TAKAMI H., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., THAELE J., TIBOLLA O., TORRES D.F., TOYAMA T., TREVES A., VOGLER P., WAGNER R.M., ZANDANEL F., ZANIN R., BERDYUGIN A., VORNANEN T., LAEHTEENMAEKI A., TAMMI J., TORNIKOSKI M., HOVATTA T., MAX-MOERBECK W., READHEAD A., RICHARDS J., HAYASHIDA M., SANCHEZ D.A. (The Fermi-LAT Collaboration), MARSCHER A. and JORSTAD S.

Abstract (from CDS):

We study the multifrequency emission and spectral properties of the quasar 3C 279 aimed at identifying the radiation processes taking place in the source. We observed 3C 279 in very-high-energy (VHE, E>100GeV) γ-rays, with the MAGIC telescopes during 2011, for the first time in stereoscopic mode. We combined these measurements with observations at other energy bands: in high-energy (HE, E>100MeV) γ-rays from Fermi-LAT; in X-rays from RXTE; in the optical from the KVA telescope; and in the radio at 43GHz, 37GHz, and 15GHz from the VLBA, Metsaehovi, and OVRO radio telescopes - along with optical polarisation measurements from the KVA and Liverpool telescopes. We examined the corresponding light curves and broadband spectral energy distribution and we compared the multifrequency properties of 3C 279 at the epoch of the MAGIC observations with those inferred from historical observations. During the MAGIC observations (2011 February 8 to April 11) 3C 279 was in a low state in optical, X-ray, and γ-rays. The MAGIC observations did not yield a significant detection. The derived upper limits are in agreement with the extrapolation of the HE γ-ray spectrum, corrected for EBL absorption, from Fermi-LAT. The second part of the MAGIC observations in 2011 was triggered by a high-activity state in the optical and γ-ray bands. During the optical outburst the optical electric vector position angle (EVPA) showed a rotation of ∼180°. Unlike previous cases, there was no simultaneous rotation of the 43GHz radio polarisation angle. No VHE γ-rays were detected by MAGIC, and the derived upper limits suggest the presence of a spectral break or curvature between the Fermi-LAT and MAGIC bands. The combined upper limits are the strongest derived to date for the source at VHE and below the level of the previously detected flux by a factor of ∼2. Radiation models that include synchrotron and inverse Compton emissions match the optical to γ-ray data, assuming an emission component inside the broad line region with size R=1.1x10¹⁶cm and magnetic field B=1.45G responsible for the high-energy emission, and another one outside the broad line region and the infrared torus (R=1.5x10¹⁷cm and B=0.8G) causing the optical and low-energy emission. We also study the optical polarisation in detail and interpret it with a bent trajectory model.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: galaxies - galaxies: active - quasars: individual: 3C 279 - galaxies: jets - radiation mechanisms: non-thermal - relativistic processes

Simbad objects: 11

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Number of rows : 11

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	NGC 1275	Bla	03 19 48.1599902040	+41 30 42.108850836		13.10	12.48	11.09		~	4243	3
2	M 1	SNR	05 34 31.8	+22 01 03						~	6516	1
3	7C 122223.5+213929	Bla	12 24 54.4583146056	+21 22 46.385507388		17.56	17.50	18.2		~	770	2
4	M 87	AGN	12 30 49.42338414	+12 23 28.0436859	10.16	9.59	8.63		7.49	~	7815	3
5	3C 279	Bla	12 56 11.16657958	-05 47 21.5251510		18.01	17.75	15.87		~	3205	2
6	3C 286	Sy1	13 31 08.2883506368	+30 30 32.960091564		17.51	17.25			~	4558	2
7	QSO J1512-0906	Bla	15 12 50.53293048	-09 05 59.8297908		16.74	16.54			~	1409	1
8	V* V1521 Cyg	HXB	20 32 25.78	+40 57 27.9						WN4/5-6/7	2035	2
9	DR 21	SFR	20 39 01.6	+42 19 38						O4.5	1121	0
10	NGC 7027	PN	21 07 01.571952	+42 14 10.47120		10.358	8.831	10.157		~	2541	1
11	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792		15.66	14.72			~	2397	1

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