The 0.5-10keV spectra of broad-line quasars and the X-ray background

被引：0

作者：

Pappa, A ^{[1
]}

Stewart, GC ^{[1
]}

Georgantopoulos, I ^{[1
]}

Griffiths, RE ^{[1
]}

Boyle, BJ ^{[1
]}

Shanks, T ^{[1
]}

Almaini, O ^{[1
]}

机构：

[1] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

来源：

X-RAY ASTRONOMY: STELLAR ENDPOINTS, AGN, AND THE DIFFUSE X-RAY BACKGROUND | 2001年 / 599卷

关键词：

surveys; galaxies : active; galaxies : general; X-rays : galaxies; X-rays : general;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of the ROSAT and ASCA spectra of 21 broad line quasars detected in six ROSAT deep fields with the ASCA GIS.. The summed spectrum in the ASCA band is well described by a power-law with Gamma = 1.56 +/- 0.2, flatter that the average spectral index of bright quasars. The 0.5-8keV ASCA -ROSAT spectrum is well fit by a power-law of Gamma = 1.7 +/- 0.2 when a soft excess component is included. The analysis of the individual hardness ratios confirms the flattening of the spectral index towards fainter fluxes.

引用

页码：834 / 837

页数：2

共 50 条

[31] Individual Estimates of the Virial Factor in 10 Quasars: Implications on the Kinematics of the Broad-line Region
Mediavilla, E.
Jimenez-vicente, J.
Mejia-restrepo, J.
Motta, V
Falco, E.
Munoz, J. A.
Fian, C.
Guerras, E.
ASTROPHYSICAL JOURNAL, 2020, 895 (02):
[32] Ginga observations of the X-ray spectra of quasars
Mon Not Royal Astron Soc, 4 (920):
[33] The extragalactic X-ray background at 0.25 keV
Warwick, RS
Roberts, TP
ASTRONOMISCHE NACHRICHTEN, 1998, 319 (1-2) : 59 - 62
[34] ABRIXAS: an imaging X-ray survey in the 0.5-10 keV range
Friedrich, P
X-RAY OPTICS, INSTRUMENTS, AND MISSIONS, 1998, 3444 : 342 - 349
[35] Chandra X-ray observations of radio-loud broad absorption line quasars
Brotherton, MS
Laurent-Muehleisen, SA
Becker, RH
Gregg, MD
Telis, G
White, RL
Shang, ZH
ASTRONOMICAL JOURNAL, 2005, 130 (05): : 2006 - 2011
[36] Correlation of the 2-10 keV X-ray background with nearby galaxies
Advances in Space Research, 16 (03):
[37] X-RAY OBSERVATIONS OF IRAS SELECTED SEYFERT-GALAXIES AND OBSCURATION OF THE BROAD-LINE REGION
WARD, MJ
DONE, C
FABIAN, AC
TENNANT, AF
SHAFER, RA
ASTROPHYSICAL JOURNAL, 1988, 324 (02): : 767 - &
[38] X-Ray Structure between the Innermost Disk and Optical Broad-line Region in NGC 4151
Miller, J. M.
Cackett, E.
Zoghbi, A.
Barret, D.
Behar, E.
Brenneman, L. W.
Fabian, A. C.
Kaastra, J. S.
Lohfink, A.
Mushotzky, R. F.
Nandra, K.
Raymond, J.
ASTROPHYSICAL JOURNAL, 2018, 865 (02):
[39] Resolving the 10-40 keV Cosmic X-ray background with Constellation-X
Matt, G
Pompilio, F
La Franca, F
X-RAY ASTRONOMY: STELLAR ENDPOINTS, AGN, AND THE DIFFUSE X-RAY BACKGROUND, 2001, 599 : 762 - 765
[40] Broadband X-Ray Observation of Broad-line Radio Galaxy 3C 109
Chalise, Sulov
Lohfink, Anne M.
Kara, Erin
Fabian, Andrew C.
ASTROPHYSICAL JOURNAL, 2020, 897 (01):

← 1 2 3 4 5 →