2009ApJ...699..976A

Query : 2009ApJ...699..976A

2009ApJ...699..976A - Astrophys. J., 699, 976-984 (2009/July-2)

Fermi/Large Area Telescope discovery of gamma-ray emission from a relativistic jet in the narrow-line quasar PMN J0948+0022.

ABDO A.A., ACKERMANN M., AJELLO M., AXELSSON M., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BATTELINO M., BAUGHMAN B.M., BECHTOL K., BELLAZZINI R., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., CALIANDRO G.A., CAMERON R.A., CARAVEO P.A., CASANDJIAN J.M., CAVAZZUTI E., CECCHI C., CHEKHTMAN A., CHEUNG C.C., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., COLLMAR W., CONRAD J., COSTAMANTE L., DERMER C.D., DE ANGELIS A., DE PALMA F., DIGEL S.W., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., FARNIER C., FAVUZZI C., FOCKE W.B., FOSCHINI L., FRAILIS M., FUHRMANN L., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GEHRELS N., GERMANI S., GIEBELS B., GIGLIETTO N., GIORDANO F., GIROLETTI M., GLANZMAN T., GRENIER I.A., GRONDIN M.-H., GROVE J.E., GUILLEMOT L., GUIRIEC S., HANABATA Y., HARDING A.K., HARTMAN R.C., HAYASHIDA M., HAYS E., HUGHES R.E., JOHANNESSON G., JOHNSON A.S., JOHNSON R.P., JOHNSON W.N., KAMAE T., KATAGIRI H., KATAOKA J., KERR M., KNODLSEDER J., KUEHN F., KUSS M., LANDE J., LATRONICO L., LEMOINE-GOUMARD M., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAKEEV A., MAX-MOERBECK W., MAZZIOTTA M.N., McCONVILLE W., McENERY J.E., MEURER C., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NOLAN P.L., NORRIS J.P., NUSS E., OHSUGI T., OMODEI N., ORLANDO E., ORMES J.F., PANEQUE D., PANETTA J.H., PARENT D., PAVLIDOU V., PEARSON T.J., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., RAINO S., RANDO R., RAZZANO M., READHEAD A., REIMER A., REIMER O., REPOSEUR T., RICHARDS J.L., RITZ S., RODRIGUEZ A.Y., ROMANI R.W., RYDE F., SADROZINSKI H.F.-W., SAMBRUNA R., SANCHEZ D., SANDER A., SAZ PARKINSON P.M., SCARGLE J.D., SCHALK T.L., SGRO C., SMITH D.A., SPANDRE G., SPINELLI P., STARCK J.-L., STEVENSON M., STRICKMAN M.S., SUSON D.J., TAGLIAFERRI G., TAKAHASHI H., TANAKA T., THAYER J.G., THOMPSON D.J., TIBALDO L., TIBOLLA O., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VILCHEZ N., VITALE V., WAITE A.P., WINER B.L., WOOD K.S., YLINEN T., ZENSUS J.A., ZIEGLER M. (The Fermi-LAT Collaboration), GHISELLINI G., MARASCHI L., TAVECCHIO F. and ANGELAKIS E.

Abstract (from CDS):

We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope of high-energy γ-ray emission from the peculiar quasar PMN J0948+0022 (z = 0.5846). The optical spectrum of this object exhibits rather narrow Hβ (FWHM(Hβ) ∼1500 km/s), weak forbidden lines, and is therefore classified as a narrow-line type I quasar. This class of objects is thought to have relatively small black hole mass and to accrete at a high Eddington ratio. The radio loudness and variability of the compact radio core indicate the presence of a relativistic jet. Quasi-simultaneous radio/optical/X-ray and γ-ray observations are presented. Both radio and γ-ray emissions (observed over five months) are strongly variable. The simultaneous optical and X-ray data from Swift show a blue continuum attributed to the accretion disk and a hard X-ray spectrum attributed to the jet. The resulting broadband spectral energy distribution (SED) and, in particular, the γ-ray spectrum measured by Fermi are similar to those of more powerful Flat-Spectrum Radio Quasars (FSRQs). A comparison of the radio and γ-ray characteristics of PMN J0948+0022 with the other blazars detected by LAT shows that this source has a relatively low radio and γ-ray power with respect to other FSRQs. The physical parameters obtained from modeling the SED also fall at the low power end of the FSRQ parameter region discussed in Celotti & Ghisellini. We suggest that the similarity of the SED of PMN J0948+0022 to that of more massive and more powerful quasars can be understood in a scenario in which the SED properties depend on the Eddington ratio rather than on the absolute power.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - gamma rays: observations - quasars: individual: PMN J0948+0022

Simbad objects: 7

Full paper

View the references in ADS

Number of rows : 7

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 Vela Pulsar	Psr	08 35 20.65525	-45 10 35.1545			15.10		~	2446	1
2	ICRF J090939.8+020005	BLL	09 09 39.8480034240	+02 00 05.263770168		20.23	19.68	18.62	~	82	1
3	QSO B0907-023	Bla	09 09 44.9240838552	-02 31 30.358736220		19.1	18.56	18.2	~	92	1
4	QSO J0948+0022	Bla	09 48 57.32005819	+00 22 25.5596984		18.85	18.61	18.17	~	350	2
5	PMN J0953-0840	BLL	09 53 02.7095643576	-08 40 18.360856776	16.99	16.73	16.69	17.4	~	82	1
6	QSO J1016+0513	Bla	10 16 03.13647602	+05 13 02.3413146		20.26	19.83	20	~	162	1
7	3C 286	Sy1	13 31 08.2883506368	+30 30 32.960091564		17.51	17.25		~	4558	2

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