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题名: THE CONTRIBUTION OF QUASARS TO THE COSMIC X-RAY-BACKGROUND
作者: ZHOU, YY ;  HU, YD ;  YU, KN ;  YOUNG, ECM
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 1993
卷号: 267, 期号:1, 页码:11-20
关键词: MEDIUM-SENSITIVITY SURVEY ;  LUMINOSITY FUNCTION ;  EVOLUTION ;  QSOS ;  SPECTRUM ;  EMISSION ;  SAMPLE
学科分类: Physics
通讯作者: ZHOU, YY , UNIV SCI & TECHNOL CHINA, CTR ASTROPHYS, HEFEI 230026, PEOPLES R CHINA.
部门归属: CHINA CTR ADV SCI & TECHNOL, WORLD LAB, BEIJING, PEOPLES R CHINA; CHINESE ACAD SCI, INST THEORET PHYS, BEIJING 100080, PEOPLES R CHINA; CITY POLYTECH HONG KONG, DEPT APPL SCI, KOWLOON, HONG KONG
英文摘要: Adopting the Schmidt-Green (1983) function and the Heisler-Ostriker (1988) function as the optical evolution function and the Avni-Tananbaum (1986) (AT) function as the X-ray luminosity conditional probability function, we have calculated the contribution U of quasars (QSOs) to the cosmic X-ray background (CXB) and have determined its sensitivities to the values of q(o), alpha(o), alpha(x) and all parameters of the AT function, and have found that the values q(o), alpha(o), alpha(x), and the parameters A(o), A(z) and A of the AT function affect the U value significantly. Therefore the U value is a sensitive test of the optical and the X-ray evolutionary functions. We have further tested the evolutionary function of QSOs by comparing the calculated X-ray counts with observations and considering the feasibility of the alpha(ox)-alpha(ox)lim (alpha(ox) reflects the calculated ratio of the optical and X-ray luminosities while alpha(ox)lim is calculated from the observed limiting X-ray flux) distribution of undetected sources. Although the alpha(ox)*-alpha(ox)lim distribution gives only a one way limit, it is relatively sensitive to the AT function parameters. Using this distribution and using the X-ray counts we have revised the parameters of the X-ray evolution function. Finally, we have obtained the contribution of QSOs and active galactic nuclei (AGNs) with M < - 20.5m to be about 10% and 30-60% to the CXB at 2 keV respectively.
收录类别: SCI
WOS记录号: WOS:A1993KD75600013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12067
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
ZHOU, YY,HU, YD,YU, KN,et al. THE CONTRIBUTION OF QUASARS TO THE COSMIC X-RAY-BACKGROUND[J]. ASTRONOMY & ASTROPHYSICS,1993,267(1):11-20.
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