The discovery of hard X-ray emission in the persistent flux of the Rapid Burster

Abstract

We report the first detection with INTEGRAL of persistent hard X-ray emission (20 to 100 keV) from the Rapid Burster (MXB 1730-335), and describe its full spectrum from 3 to 100 keV. The source was detected on February/March 2003 during one of its recurrent outbursts. The source was clearly detected with a high signal to noise ratio during the single pointings and is well distinguished from the neighboring source GX 354-0. The 3 - 100 keV X-ray spectrum of the persistent emission is well described by a two-component model consisting of a blackbody plus a power-law with photon index ~ 2.4. The estimated luminosity was ~ 8.5x10^{36} erg/s in the 3 - 20 keV energy band and \~ 1.3x10^{36} erg/s in the 20 - 100 keV energy range, for a distance of 8 kpc.

arXiv comment5 pages, 6 figures, 1 table. Accepted for publication in A&A

References in corpus (10)

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• The INTEGRAL Science Data Centre (ISDC)
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• A strongly truncated inner accretion disk in the Rapid Burster
• The Galactic LMXB Population and the Galactic Centre Region
• Indications for a slow rotator in the Rapid Burster from its thermonuclear bursting behaviour
• Double-peaked thermonuclear bursts at the soft-hard state transition in the Rapid Burster
• Catalog of outbursts of neutron star LMXBs
• Statistical properties of type-II bursts in Rapid Burster observed with Insight-HXMT