Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105

	Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105
	Stiele, H.1; Yu, W.
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-06-01
卷号	441 期号:2 页码:1177-1185
关键词	black hole physics binaries: close X-rays: binaries X-rays: individual: GRS 1915+105
英文摘要	The well-known black hole X-ray binary GRS 1915+105 is a unique source in the sense that it cannot be classified within the standard picture of black hole binary states. In this work, we study archival XMM-Newton observations taken between 2003 and 2004 of the chi variability class of GRS 1915+105, which corresponds to the hard state in the standard black hole X-ray binary state classification. The crucial point of our study is that by using XMM-Newton data, we can access the variability below 3 keV, an energy range that is not covered with RXTE. We focus on the study of the power spectral shape in the soft and hard X-ray band, in light of our work done with Swift on MAXI J1659-152. In the hard band (above 2.5 keV), power density spectra consist of band-limited noise and quasi-periodic oscillations, corresponding to the power spectral shape seen in the hard or intermediate state, while in the soft band the averaged power density spectrum is consistent with a power-law noise, corresponding to the power spectral shape usually seen in the soft state. The coexisting of two different power spectral shapes in the soft and hard band, where the soft-band power spectrum is dominated by a power-law noise, is consistent with MAXI J1659-152, and confirms the energy dependence of power spectral states. Our additional spectral analysis shows that the disc component does contribute to the soft-band flux. These findings support that the observed black hole power spectral state depends on which spectral component we are looking at, which implies that power spectral analysis is probably a more sensitive method than spectral modelling to trace the emergence of the disc component in the hard or intermediate state.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	BLACK-HOLE CANDIDATE ; QUASI-PERIODIC OSCILLATIONS ; XMM-NEWTON VIEW ; IGR J17091-3624 ; DOMINATED ACCRETION ; PLATEAU STATE ; 2011 OUTBURST ; CYGNUS X-1 ; FREQUENCY ; BINARIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000336494800020
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18171]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Ctr Galaxy & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Stiele, H.,Yu, W.. Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,441(2):1177-1185.
APA	Stiele, H.,&Yu, W..(2014).Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,441(2),1177-1185.
MLA	Stiele, H.,et al."Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 441.2(2014):1177-1185.