Speaker
Mr
Wenda Zhang
(Shanghai Astronomical Observatory)
Description
We report the discovery of a 4.1-sigma significance 9.5 mHz QPO in
Swift/XRT observation of the black hole candidate 4U 1630-472. mHz QPO
with period longer than 100 seconds has never been discovered in this
source. Phase-resolved spectroscopy revealed an accretion disk inner
radius without significant change with phase. Phase dependent iron
absorption feature has been discovered for the first time in this
source. Under typical systematical parameters for a Galactic black hole
binary system, the inner radius lies in the very vicinity of the black
hole. We assumed that the accretion disk existed down to the ISCO. This
allows us to measure the spin of 4U 1630$-$472 for possible binary
system systematical parameters.
Primary author
Mr
Wenda Zhang
(Shanghai Astronomical Observatory)
Co-authors
Prof.
Michal Dovčiak
(Astronomical Institute of Academy of Sciences of the Czech Republic)
Prof.
Vladimír Karas
(Astronomical Institute of Academy of Sciences of the Czech Republic)
Prof.
Wenfei Yu
(Shanghai Astronomical Observatory)
