The X-ray Spectrum of the Rapid Burster using the Chandra HETGS

Details The X-ray Spectrum of the Rapid Burster using the Chandra HETGS The X-ray Spectrum of the Rapid Burster using the Chandra HETGS

2001-03-14

arxiv.org/abs/astro-ph/0103203v4

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, accepted for publication in AJ (with minor changes and enhanced discussion of the instrument configuratio

Scientific paper

10.1086/321142

We present observations of the Rapid Burster (RB, also known as MXB 1730-335) using the Chandra High Energy Transmission Grating Spectrometer. The average interval between type II (accretion) bursts was about 40 s. There was one type I (thermonuclear flash) burst and about 20 "mini-bursts" which are probably type II bursts whose peak flux is 10-40% of the average peak flux of the other type II bursts. The time averaged spectra of the type II bursts are well fit by a blackbody with a temperature of kT = 1.6 keV, a radius of 8.9 km for a distance of 8.6 kpc, and an interstellar column density of 1.7e22 per sq. cm. No narrow emission or absorption lines were clearly detected. The 3 sigma upper limits to the equivalent widths of any features are < 10 eV in the 1.1-7.0 keV band and as small as 1.5 eV near 1.7 keV. We suggest that Comptonization destroys absorption features such as the resonance line of Fe XXVI.

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