2012ApJ...751..159A

Query : 2012ApJ...751..159A

2012ApJ...751..159A - Astrophys. J., 751, 159 (2012/June-1)

Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state.

ACKERMANN M., AJELLO M., BALLET J., BARBIELLINI G., BASTIERI D., BELLAZZINI R., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BOTTACINI E., BREGEON J., BRIGIDA M., BRUEL P., BUEHLER R., BUSON S., CALIANDRO G.A., CAMERON R.A., CARAVEO P.A., CASANDJIAN J.M., CAVAZZUTI E., CECCHI C., CHARLES E., CHEKHTMAN A., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., CUTINI S., D'AMMANDO F., DE PALMA F., DERMER C.D., DO COUTO E SILVA E., DRELL P.S., DRLICA-WAGNER A., DUBOIS R., FAVUZZI C., FEGAN S.J., FERRARA E.C., FOCKE W.B., FORTIN P., FUHRMANN L., FUKAZAWA Y., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GERMANI S., GIGLIETTO N., GIOMMI P., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GRENIER I.A., GUIRIEC S., HADASCH D., HAYASHIDA M., HUGHES R.E., ITOH R., JOHANNESSON G., JOHNSON A.S., KATAGIRI H., KATAOKA J., KNODLSEDER J., KUSS M., LANDE J., LARSSON S., LEE S.-H., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAZZIOTTA M.N., McENERY J.E., MEHAULT J., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NAUMANN-GODO M., NISHINO S., NORRIS J.P., NUSS E., OHSUGI T., OKUMURA A., OMODEI N., ORLANDO E., OZAKI M., PANEQUE D., PANETTA J.H., PELASSA V., PESCE-ROLLINS M., PIERBATTISTA M., PIRON F., PIVATO G., PORTER T.A., RAINO S., RANDO R., RASTAWICKI D., RAZZANO M., READHEAD A., REIMER A., REIMER O., REYES L.C., RICHARDS J.L., SBARRA C., SGRO C., SISKIND E.J., SPANDRE G., SPINELLI P., SZOSTEK A., TAKAHASHI H., TANAKA T., THAYER J.G., THAYER J.B., THOMPSON D.J., TINIVELLA M., TORRES D.F., TOSTI G., TROJA E., USHER T.L., VANDENBROUCKE J., VASILEIOU V., VIANELLO G., VITALE V., WAITE A.P., WINER B.L., WOOD K.S., YANG Z., ZIMMER S. (The Fermi-LAT Collaboration), MODERSKI R., NALEWAJKO K., SIKORA M., VILLATA M., RAITERI C.M., ALLER H.D., ALLER M.F., ARKHAROV A.A., BENITEZ E., BERDYUGIN A., BLINOV D.A., BOETTCHER M., BRAVO CALLE O.J.A., BUEMI C.S., CAROSATI D., CHEN W.P., DILTZ C., DI PAOLA A., DOLCI M., EFIMOVA N.V., FORNE E., GURWELL M.A., HEIDT J., HIRIART D., JORDAN B., KIMERIDZE G., KONSTANTINOVA T.S., KOPATSKAYA E.N., KOPTELOVA E., KURTANIDZE O.M., LAHTEENMAKI A., LARIONOVA E.G., LARIONOVA L.V., LARIONOV V.M., LETO P., LINDFORS E., LIN H.C., MOROZOVA D.A., NIKOLASHVILI M.G., NILSSON K., OKSMAN M., ROUSTAZADEH P., SIEVERS A., SIGUA L.A., SILLANPAA A., TAKAHASHI T., TAKALO L.O., TORNIKOSKI M., TRIGILIO C., TROITSKY I.S., UMANA G. (The GASP-WEBT Consortium), ANGELAKIS E., KRICHBAUM T.P., NESTORAS I., RIQUELME D. (The F-GAMMA Team), KRIPS M., TRIPPE S. (The IRAM-PDBI), ARAI A., KAWABATA K.S., SAKIMOTO K., SASADA M., SATO S., UEMURA M., YAMANAKA M., YOSHIDA M. (The Kanata Team), BELLONI T., TAGLIAFERRI G. (The RXTE Team), BONNING E.W., ISLER J., URRY C.M. (The SMARTS Team), HOVERSTEN E., FALCONE A., PAGANI C., STROH M. (The Swift-XRT Team)

Abstract (from CDS):

The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuous coverage by Fermi, contemporaneous observations were carried out from the radio to γ-ray bands between 2008 September and 2009 February. In this paper, we summarize the rich multi-wavelength data collected during the campaign (including F-GAMMA, GASP-WEBT, Kanata, OVRO, RXTE, SMARTS, Swift, and other instruments), examine the cross-correlation between the light curves measured in the different energy bands, and interpret the resulting spectral energy distributions in the context of well-known blazar emission models. We find that the γ-ray activity is well correlated with a series of near-IR/optical flares, accompanied by an increase in the optical polarization degree. On the other hand, the X-ray light curve shows a distinct 20 day high state of unusually soft spectrum, which does not match the extrapolation of the optical/UV synchrotron spectrum. We tentatively interpret this feature as the bulk Compton emission by cold electrons contained in the jet, which requires an accretion disk corona with an effective covering factor of 19% at a distance of 100 R_g. We model the broadband spectra with a leptonic model with external radiation dominated by the infrared emission from the dusty torus.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: individual: AO 0235+164 - galaxies: active - galaxies: jets - gamma rays: galaxies - radiation mechanisms: non-thermal

Simbad objects: 8

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Number of rows : 8

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	NAME W 3 OH	HII	02 27 04.1	+61 52 22					~	1064	2
2	QSO B0235+1624	BLL	02 38 38.93010450	+16 36 59.2745528		16.46	15.50	15.92	~	1614	2
3	V* CC Cas	SB*	03 14 05.3361655368	+59 33 48.485582712	7.07	7.56	7.08		O8.5III(n)((f))	308	0
4	HD 25443	*	04 06 08.0655259656	+62 06 06.607649268	6.45	6.998	6.766		B0.5III	155	0
5	3C 286	Sy1	13 31 08.2883506368	+30 30 32.960091564		17.51	17.25		~	4558	2
6	NAME K 3-50A	HII	20 01 45.6	+33 32 42					~	85	0
7	NGC 7027	PN	21 07 01.571952	+42 14 10.47120		10.358	8.831	10.157	~	2541	1
8	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792		15.66	14.72		~	2397	1

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