Speaker
Mr
Junjie Mao
(NAOC)
Description
The diffuse interstellar dust will not only absorb those X-ray photons emitted by point source, but also scatter the X-ray, which may produce a diffuse halo around the point source. The angular distribution of halo intensity caused by single scattering can be determined by the spectrum of the point source, interstellar dust model and dust spatial distribution along the line of sight (LOS). Thus, X-ray dust scattering halo can be used to study the properties of interstellar dust, as well as the point sources. We studied the lightcurves of X-ray dust scattering halo of IGR J17544-2619, which is a supergiant fast X-ray transient (SFXT). During the observation given by Chandra X-ray Observatory on July 3, 2004, we found a desirable lightcurve of the outburst of the source. Analyzing the PSF subtracted lightcurve of the halo at different radii, and using the cross correlation method, we estimate the location of the dust concentration along LOS.
Primary author
Mr
Junjie Mao
(NAOC)
