PREDICTIONS FOR THE REVERBERATING SPECTRAL LINE FROM A NEWLY FORMED BLACK HOLE ACCRETION DISK: CASE OF TIDAL DISRUPTION FLARES

	PREDICTIONS FOR THE REVERBERATING SPECTRAL LINE FROM A NEWLY FORMED BLACK HOLE ACCRETION DISK: CASE OF TIDAL DISRUPTION FLARES
	Zhang, Wenda 1,2; Yu, Wenfei1,2 ; Karas, Vladimir 3; Dovciak, Michal 3
刊名	ASTROPHYSICAL JOURNAL
	2015-07-01
卷号	807 期号:1 页码:1
关键词	accretion black hole physics galaxies: nuclei accretion disks
英文摘要	Tidal disruption events (TDEs) can be perfect probes of dormant supermassive black holes in normal galaxies. During the rising phase, the accretion luminosity can increase by orders of magnitude in several weeks, and the emergent ionizing radiation illuminates the fresh accretion flow. In this paper, we simulated the evolution of the expected spectral line profile of iron due to such a flare by using a ray-tracing code with effects of general relativity taken into account. We found that the time-dependent profile changes significantly with black hole spin, inclination angle with respect to the black hole equatorial plane, and the expansion velocity of the ionization front. At low values of spin, a "loop" feature appears in the line profile versus time plot when the inclination is no less than 30 degrees and the expansion velocity v(exp) is no less than half the speed of light, owing to a shadow in the emission of the truncated disk. In the light curve two peaks occur depending on the inclination angle. At large vexp, a shallow "nose" feature may develop ahead of the loop; its duration depends on the expansion velocity and the inclination angle. We explore the entire interval of black hole spin parameter ranging from extreme prograde to extreme retrograde rotation, -1 < a < 1. In the prograde case, a low-energy tail appears to be more pronounced in the evolving centroid energy of the line. Our results demonstrate the importance of searching for X-ray spectral lines in the early phase of TDE flares in order to constrain black hole mass and spin, as well as properties of the innermost accretion flow.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; X-RAY REVERBERATION ; K-ALPHA LINE ; IRON LINE ; STARS ; GALAXY ; REFLECTION ; OUTBURST ; SPECTROSCOPY ; FLUORESCENCE
收录类别	SCI
语种	英语
WOS记录号	WOS:000358945200089
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/28210]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Acad Sci Czech Republic, Astron Inst, CZ-14100 Prague, Czech Republic
推荐引用方式 GB/T 7714	Zhang, Wenda,Yu, Wenfei,Karas, Vladimir,et al. PREDICTIONS FOR THE REVERBERATING SPECTRAL LINE FROM A NEWLY FORMED BLACK HOLE ACCRETION DISK: CASE OF TIDAL DISRUPTION FLARES[J]. ASTROPHYSICAL JOURNAL,2015,807(1):1.
APA	Zhang, Wenda,Yu, Wenfei,Karas, Vladimir,&Dovciak, Michal.(2015).PREDICTIONS FOR THE REVERBERATING SPECTRAL LINE FROM A NEWLY FORMED BLACK HOLE ACCRETION DISK: CASE OF TIDAL DISRUPTION FLARES.ASTROPHYSICAL JOURNAL,807(1),1.
MLA	Zhang, Wenda,et al."PREDICTIONS FOR THE REVERBERATING SPECTRAL LINE FROM A NEWLY FORMED BLACK HOLE ACCRETION DISK: CASE OF TIDAL DISRUPTION FLARES".ASTROPHYSICAL JOURNAL 807.1(2015):1.