2015ApJ...799..143A

Query : 2015ApJ...799..143A

2015ApJ...799..143A - Astrophys. J., 799, 143 (2015/February-1)

Gamma-ray flaring activity from the gravitationally lensed blazar PKS 1830-211 observed by Fermi LAT.

ABDO A.A., ACKERMANN M., AJELLO M., ALLAFORT A., AMIN M.A., BALDINI L., BARBIELLINI G., BASTIERI D., BECHTOL K., BELLAZZINI R., BLANDFORD R.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BRIGIDA M., BUEHLER R., BULMASH D., BUSON S., CALIANDRO G.A., CAMERON R.A., CARAVEO P.A., CAVAZZUTI E., CECCHI C., CHARLES E., CHEUNG C.C., CHIANG J., CHIARO G., CIPRINI S., CLAUS R., COHEN-TANUGI J., CONRAD J., CORBET R.H.D., CUTINI S., D'AMMANDO F., DE ANGELIS A., DE PALMA F., DERMER C.D., DRELL P.S., DRLICA-WAGNER A., FAVUZZI C., FINKE J., FOCKE W.B., FUKAZAWA Y., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GIGLIETTO N., GIORDANO F., GIROLETTI M., GLANZMAN T., GRENIER I.A., GROVE J.E., GUIRIEC S., HADASCH D., HAYASHIDA M., HAYS E., HUGHES R.E., INOUE Y., JACKSON M.S., JOGLER T., JOHANNESSON G., JOHNSON A.S., KAMAE T., KNODLSEDER J., KUSS M., LANDE J., LARSSON S., LATRONICO L., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAZZIOTTA M.N., MEHAULT J., MICHELSON P.F., MIZUNO T., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NEMMEN R., NUSS E., OHNO M., OHSUGI T., PANEQUE D., PERKINS J.S., PESCE-ROLLINS M., PIRON F., PIVATO G., PORTER T.A., RAINO S., RANDO R., RAZZANO M., REIMER A., REIMER O., REYES L.C., RITZ S., ROMOLI C., ROTH M., SAZ PARKINSON P.M., SGRO C., SISKIND E.J., SPANDRE G., SPINELLI P., TAKAHASHI H., TAKEUCHI Y., TANAKA T., THAYER J.G., THAYER J.B., THOMPSON D.J., TIBALDO L., TINIVELLA M., TORRES D.F., TOSTI G., TROJA E., TRONCONI V., USHER T.L., VANDENBROUCKE J., VASILEIOU V., VIANELLO G., VITALE V., WAITE A.P., WERNER M., WINER B.L. and WOOD K.S.

Abstract (from CDS):

The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope routinely detects the MeV-peaked flat-spectrum radio quasar PKS 1830-211 (z = 2.507). Its apparent isotropic γ-ray luminosity (E > 100 MeV), averaged over ∼3 years of observations and peaking on 2010 October 14/15 at 2.9x10⁵⁰ erg/s, makes it among the brightest high-redshift Fermi blazars. No published model with a single lens can account for all of the observed characteristics of this complex system. Based on radio observations, one expects time-delayed variability to follow about 25 days after a primary flare, with flux about a factor of 1.5 less. Two large γ-ray flares of PKS 1830-211 have been detected by the LAT in the considered period, and no substantial evidence for such a delayed activity was found. This allows us to place a lower limit of about 6 on the γ-ray flux ratio between the two lensed images. Swift XRT observations from a dedicated Target of Opportunity program indicate a hard spectrum with no significant correlation of X-ray flux with the γ-ray variability. The spectral energy distribution can be modeled with inverse Compton scattering of thermal photons from the dusty torus. The implications of the LAT data in terms of variability, the lack of evident delayed flare events, and different radio and γ-ray flux ratios are discussed. Microlensing effects, absorption, size and location of the emitting regions, the complex mass distribution of the system, an energy-dependent inner structure of the source, and flux suppression by the lens galaxy for one image path may be considered as hypotheses for understanding our results.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: galaxies - gamma rays: general - gravitational lensing: strong - quasars: individual: PKS 1830-211 - radiation mechanisms: non-thermal - X-rays: individual: PKS 1830-211

Simbad objects: 9

Full paper

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Number of rows : 9

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	6C 021803+354230	BLL	02 21 05.4920852208	+35 56 13.848581904	20.0	20.0	19.60		~	603	3
2	NVSS J053942+143345	Bla	05 39 42.36599322	+14 33 45.5616887					~	104	1
3	7C 134328.69+450758.00	Bla	13 45 33.17247907	+44 52 59.5725560			19.6		~	138	1
4	QSO J1626-2951	Bla	16 26 06.02084013	-29 51 26.9712990	18.41	20.5	17.6		~	452	1
5	PSR J1809-2332	Psr	18 09 50.250	-23 32 22.68		21.47	19.61	17.48	M5	103	0
6	QSO B1830-211	Bla	18 33 39.9399138048	-21 03 39.368838780		18.70	21		~	724	1
7	QSO J2240+0321	QSO	22 40 30.234	+03 21 30.63					~	705	1
8	Z 378-15	AGN	22 40 30.23447	+03 21 30.6290					~	636	0
9	3C 454.3	Bla	22 53 57.7480438728	+16 08 53.561508864	16.57	16.10	15.22		~	3004	2

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