Star Formation History in the Magellanic Clouds: X-Ray Observations of Stellar Remnants

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The Advanced Satellite for Cosmology and Astrophysics (ASCA) has observed a significant fraction of the Magellanic Clouds (MCs). We systematically analyzed all the available ASCA data on the MCs, and established a simple method of source classification according to a hardness ratio of each source. We defined, with this method, the candidates of X-ray binary pulsars (XBPs) and thermal supernova remnants (SNRs), and compared the source populations in the MCs and our Galaxy. We found that the number density of high-mass X-ray binaries (HMXBs) and candidates is extremely high in the SMC, while low-mass X-ray binaries (LMXBs) are very rare in the MCs. Based on these results, we discuss possible implicaions on the star formation history in the MCs.

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