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CALIBRATING THE CORRELATION BETWEEN BLACK HOLE MASS AND X-RAY VARIABILITY AMPLITUDE: X-RAY ONLY BLACK HOLE MASS ESTIMATES FOR ACTIVE GALACTIC NUCLEI AND ULTRA-LUMINOUS X-RAY SOURCES
Zhou, Xin-Lin1,2,3; Zhang, Shuang-Nan4,5; Wang, Ding-Xiong6; Zhu, Ling2,3
2010-02-10
Source PublicationASTROPHYSICAL JOURNAL
Volume710Issue:1Pages:16-23
AbstractA calibration is made for the correlation between the X-ray Variability Amplitude (XVA) and black hole (BH) mass. The correlation for 21 reverberation-mapped Active Galactic Nuclei (AGNs) appears very tight, with an intrinsic dispersion of 0.20 dex. The intrinsic dispersion of 0.27 dex can be obtained if BH masses are estimated from the stellar velocity dispersions. We further test the uncertainties of mass estimates from XVAs for objects that have been observed multiple times with good enough data quality. The results show that the XVAs derived from multiple observations change by a factor of 3. This means that BH mass uncertainty from a single observation is slightly worse than either reverberation-mapping or stellar velocity dispersion measurements; however, BH mass estimates with X-ray data only can be more accurate if the mean XVA value from more observations is used. With this calibrated relation, the BH mass and accretion rate may be determined for a large sample of AGNs with the planned International X-ray Observatory mission. Proper interpretation of the first AGN X-ray quasi-periodic oscillation (QPO), seen in the Seyfert galaxy REJ1034+396, depends on its BH mass, which is not currently known very well. Applying this relation, the BH mass of REJ1034+396 is found to be 4(-2)(+3) x 10(6) M(circle dot). The high end of the mass range follows the relationship between the 2f(0) frequencies of high-frequency QPO and the BH masses derived from the Galactic X-ray binaries. We also calculate the high-frequency constant C = 2.37 M(circle dot) Hz(-1) from 21 reverberation-mapped AGNs. As suggested by Gierlinski et al., M(BH) = C/C(M), where C(M) is the high-frequency variability derived from XVA. Given the similar shape of power-law dominated X-ray spectra in ultra-luminous X-ray sources (ULXs) and AGNs, this can be applied to BH mass estimates of ULXs. We discuss the observed QPO frequencies and BH mass estimates in the ULXs M82 X-1 and NGC 5408 X-1 and favor ULXs as intermediate mass BH systems.
KeywordGalaxies: Individual (Re j1034+396) Accretion X-rays: Binaries Accretion Disks X-rays: Galaxies
DOI10.1088/0004-637X/710/1/16
Indexed BySCI
Language英语
WOS IDWOS:000273850800002
Citation statistics
Cited Times:57[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7721
Collection空间科学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
3.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
5.Univ Alabama, Dept Phys, Huntsville, AL 35899 USA
6.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Xin-Lin,Zhang, Shuang-Nan,Wang, Ding-Xiong,et al. CALIBRATING THE CORRELATION BETWEEN BLACK HOLE MASS AND X-RAY VARIABILITY AMPLITUDE: X-RAY ONLY BLACK HOLE MASS ESTIMATES FOR ACTIVE GALACTIC NUCLEI AND ULTRA-LUMINOUS X-RAY SOURCES[J]. ASTROPHYSICAL JOURNAL,2010,710(1):16-23.
APA Zhou, Xin-Lin,Zhang, Shuang-Nan,Wang, Ding-Xiong,&Zhu, Ling.(2010).CALIBRATING THE CORRELATION BETWEEN BLACK HOLE MASS AND X-RAY VARIABILITY AMPLITUDE: X-RAY ONLY BLACK HOLE MASS ESTIMATES FOR ACTIVE GALACTIC NUCLEI AND ULTRA-LUMINOUS X-RAY SOURCES.ASTROPHYSICAL JOURNAL,710(1),16-23.
MLA Zhou, Xin-Lin,et al."CALIBRATING THE CORRELATION BETWEEN BLACK HOLE MASS AND X-RAY VARIABILITY AMPLITUDE: X-RAY ONLY BLACK HOLE MASS ESTIMATES FOR ACTIVE GALACTIC NUCLEI AND ULTRA-LUMINOUS X-RAY SOURCES".ASTROPHYSICAL JOURNAL 710.1(2010):16-23.
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