Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20510202t&link_type=abstract
American Astronomical Society Meeting 205, #102.02; Bulletin of the American Astronomical Society, Vol. 36, p.1511
Astronomy and Astrophysics
Astronomy
Scientific paper
Using simultaneous observations from the Chandra X-Ray Observatory and the Rossi X-Ray Timing Explorer, we investigate the low-mass X-ray binary (LMXB) and "clocked burster" GS 1826--238 with the goals of studying its broadband spectral properties and using the burst-induced temporal variability in the X-ray halo to determine the distance to the source. In a 68 ks Chandra exposure, we detect 6 type I X-ray bursts, and during 30 ks of observation with RXTE, we see 4 bursts. We present 0.6--200 keV energy spectra of both the persistent and burst emission. The persistent spectrum is fit with a black body plus comptonization model with hydrogen column density NH ≈ 4.5 x 1020 cm-2. The column density that we obtain is substantially lower than what has been reported by previous authors. We attempt to observe the temporal variability of the source in the X-ray halo, however, the scattering optical depth of the source is too small to unambiguously detect halo flux over the point spread function (PSF). We derive an upper limit on the fractional halo intensity (Ihalo=1 - e-τ sca) of about 2.5% which corresponds to a scattering optical depth τ sca ˜ 0.03. Thus, the geometrical distance determination technique could not be successfully implemented. Nonetheless, we have developed a method which can be used for variable sources with more prominent halos.
Marshall Herman L.
Rothschild Richard E.
Thompson Thomas W. J.
Tomsick John A.
No associations
LandOfFree
Chandra and RXTE Studies of the Burster GS 1826--238 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 Chandra and RXTE Studies of the Burster GS 1826--238, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra and RXTE Studies of the Burster GS 1826--238 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1641958