Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..794n&link_type=abstract
X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G
Astronomy and Astrophysics
Astronomy
2
Eclipsing Binaries, X-Ray Binaries, X-Ray Sources, X-Ray Bursts, Radiative Transfer, Scattering, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus
Scientific paper
The eclipsing X-ray binary pulsar 4U 1538-522 was observed with ASCA in March 1994 throughout the eclipse transition. Evidence of extended X-ray halo due to scattering by interstellar dust grains was seen in both the X-ray image and spectrum obtained during the eclipse phase. The radial profiles obtained in 1-2 keV and 2-5 keV bands from 4U1538-52 are consistent with the previous results obtained with ROSAT and ASCA from other Galactic sources. The 1-10 keV spectrum during out-of-eclipse phase can be fitted by a simple power law model of photon index Γ=1.2 with relatively large interstellar absorption column density. On the contrary, a steep continuum spectrum with a photon index of Γ=2.6 was observed during the eclipse. Comparing the two spectra, we can estimate the column density of the dust grains toward the source, which is substantially less than the density of the astronomical interstellar grains. This support the idea that interstellar grains are ``fluffy'' aggregates of smaller solid particles. .
Dotani Tadayasu
Endo Tomoki
Kotani Takao
Mihara Tatehiro
Nagase Fumiaki
No associations
LandOfFree
Dust scattered X-ray halo of 4U 1538-52 observed with ASCA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dust scattered X-ray halo of 4U 1538-52 observed with ASCA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dust scattered X-ray halo of 4U 1538-52 observed with ASCA will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1386893