2010ApJ...716..835A

Query : 2010ApJ...716..835A

2010ApJ...716..835A - Astrophys. J., 716, 835-849 (2010/June-2)

Suzaku observations of luminous quasars: revealing the nature of high-energy blazar emission in low-level activity states.

ABDO A.A., ACKERMANN M., AJELLO M., ANTOLINI E., BALDINI L., BALLET J., BARBIELLINI G., BARING M.G., BASTIERI D., BECHTOL K., BELLAZZINI R., BERENJI B., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BUEHLER R., BUSON S., CALIANDRO G.A., CAMERON R.A., CARRIGAN S., CASANDJIAN J.M., CAVAZZUTI E., CECCHI C., CELIK O., CHEKHTMAN A., CHEN A.W., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., COLAFRANCESCO S., CONRAD J., CUTINI S., DERMER C.D., DE PALMA F., DIGEL S.W., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., FARNIER C., FAVUZZI C., FEGAN S.J., FERRARA E.C., FOCKE W.B., FRAILIS M., FUKAZAWA Y., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GIEBELS B., GIGLIETTO N., GIOMMI P., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GRANDI P., GRENIER I.A., GUILLEMOT L., GUIRIEC S., HADASCH D., HARDING A.K., HAYASHIDA M., HORAN D., HUGHES R.E., ITOH R., JACKSON M.S., JOHANNESSON G., JOHNSON A.S., JOHNSON W.N., KAMAE T., KATAGIRI H., KATAOKA J., KAWAI N., KNODLSEDER J., KUSS M., LANDE J., LATRONICO L., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAKEEV A., MAZZIOTTA M.N., McENERY J.E., McGLYNN S., MEURER C., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NESTORAS I., NOLAN P.L., NORRIS J.P., NUSS E., OHSUGI T., OKUMURA A., ORLANDO E., ORMES J.F., OZAKI M., PANEQUE D., PANETTA J.H., PARENT D., PELASSA V., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., RAINO S., RANDO R., RAZZANO M., REIMER A., REIMER O., REYES L.C., RODRIGUEZ A.Y., ROTH M., RYDE F., SADROZINSKI H.F.-W., SAMBRUNA R., SANDER A., SATO R., SGRO C., SHAW M.S., SISKIND E.J., SMITH P.D., SPANDRE G., SPINELLI P., STAWARZ L., STECKER F.W., STRICKMAN M.S., SUSON D.J., TAKAHASHI H., TAKAHASHI T., TANAKA T., THAYER J.B., THAYER J.G., THOMPSON D.J., TIBOLLA O., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VASILEIOU V., VILCHEZ N., VILLATA M., VITALE V., VON KIENLIN A., WAITE A.P., WANG P., WINER B.L., WOOD K.S., YANG Z., YLINEN T., ZIEGLER M., TAVECCHIO F., SIKORA M., SCHADY P., ROMING P., CHESTER M.M. and MARASCHI L.

Abstract (from CDS):

We present the results from the Suzaku X-ray observations of five flat-spectrum radio quasars (FSRQs), namely PKS 0208-512, Q 0827+243, PKS 1127-145, PKS 1510-089, and 3C 454.3. All these sources were additionally monitored simultaneously or quasi-simultaneously by the Fermi satellite in gamma rays and the Swift UVOT in the UV and optical bands, respectively. We constructed their broadband spectra covering the frequency range from 1014 Hz up to 1025 Hz, and those reveal the nature of high-energy emission of luminous blazars in their low-activity states. The analyzed X-ray spectra are well fitted by a power-law model with photoelectric absorption. In the case of PKS 0208-512, PKS 1127-145, and 3C 454.3, the X-ray continuum showed indication of hardening at low energies. Moreover, when compared with the previous X-ray observations, we see a significantly increasing contribution of low-energy photons to the total X-ray fluxes when the sources are getting fainter. The same behavior can be noted in the Suzaku data alone. A likely explanation involves a variable, flat-spectrum component produced via inverse-Compton emission, plus an additional, possibly steady soft X-ray component prominent when the source gets fainter. This soft X-ray excess is represented either by a steep power-law (photon indices Γ ∼ 3-5) or a blackbody-type emission with temperatures kT ∼ 0.1-0.2 keV. We model the broadband spectra of the five observed FSRQs using synchrotron self-Compton and/or external-Compton radiation models. Our modeling suggests that the difference between the low- and high-activity states in luminous blazars is due to the different total kinetic power of the jet, most likely related to varying bulk Lorentz factor of the outflow within the blazar emission zone.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: jets - radiation mechanisms: non-thermal - X-rays: galaxies

Simbad objects: 12

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Number of rows : 12
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 QSO B0208-512 BLL 02 10 46.2004407600 -51 01 01.893013392   17.10 16.93 14.82   ~ 485 1
2 QSO J0225+1846 Bla 02 25 04.66884683 +18 46 48.7668666   20.0 20.0 19.09   ~ 122 1
3 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
4 QSO J0530+13 Bla 05 30 56.41674741 +13 31 55.1494688     20.00 19.35   ~ 1004 1
5 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
6 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
7 7C 082754.29+242103.00 Bla 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 563 1
8 QSO J1130-1449 Bla 11 30 07.0523452128 -14 49 27.388021944   17.17 16.90 16 16.97 ~ 739 1
9 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
10 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
11 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1409 1
12 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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