|The X-ray view of black-hole candidate Swift J1842.5-1124 during its 2008 outburst|
|Zhao, HH; Weng SS(翁山杉); Qu JL(屈进禄); Weng, SS; Qu, JL; Cai, JP; Yuan, QR
|发表期刊||ASTRONOMY & ASTROPHYSICS
|摘要||Context. The spectral and temporal evolution during X-ray outbursts give important clues on the accretion process and radiation mechanism in black-hole X-ray binaries (BH XRBs). Aims. A set of Swift and RXTE observations were executed to monitor the 2008 outburst of the black-hole candidate Swift J1842.5-1124. We investigate these data to explore the accretion physics in BH XRBs. Methods. We carry out a comprehensive spectral and timing analysis on all the available pointing observations, including fitting both X-ray spectra and power density spectra, measuring the optical and near-ultraviolet flux density. We also search for correlations among the spectral and timing parameters. Results. The observed properties of Swift J1842.5-1124 are similar to other BH XRBs in many respects, for example the hardness-intensity diagram and hardness-rms diagram. The type-C quasi-periodic oscillations (QPOs) were observed as the source started to transit from the low-hard state to the high-soft state. The frequency of QPOs correlate with intensity and the hard component index, and anti-correlate with the hardness and the total fractional rms. These relations are consistent with the Lense-Thirring precession model. The estimated U-band flux changed with the X-ray flux, while the flux density at the V-band remained 0.26 mJy. These results imply that the X-ray reprocessing or the tail of thermal emission from the outer disk contributes a significant fraction of the U-band radiation; alternatively, the companion star or the jet dominates the flux at longer wavelengths.|
|关键词||accretion, accretion disks
black hole physics
X-rays: individuals: Swift J1842.5-1124
; LENS-THIRRING PRECESSION
; DISC INSTABILITY MODEL
; GX 339-4
; CENTROID FREQUENCY
; BINARY TRANSIENTS
; GRS 1915+105
Zhao, HH,Weng SS,Qu JL,et al. The X-ray view of black-hole candidate Swift J1842.5-1124 during its 2008 outburst[J]. ASTRONOMY & ASTROPHYSICS,2016,593.
Zhao, HH.,翁山杉.,屈进禄.,Weng, SS.,Qu, JL.,...&Yuan, QR.(2016).The X-ray view of black-hole candidate Swift J1842.5-1124 during its 2008 outburst.ASTRONOMY & ASTROPHYSICS,593.
Zhao, HH,et al."The X-ray view of black-hole candidate Swift J1842.5-1124 during its 2008 outburst".ASTRONOMY & ASTROPHYSICS 593(2016).