ASCA Observations of OAO 1657-415 and its Dust-Scattered X-Ray Halo

Details ASCA Observations of OAO 1657-415 and its Dust-Scattered X-Ray Halo ASCA Observations of OAO 1657-415 and its Dust-Scattered X-Ray Halo

2006-01-04

arxiv.org/abs/astro-ph/0601075v1

Mon.Not.Roy.Astron.Soc. 367 (2006) 1147-1154

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10003.x

We report on two ASCA observations of the high-mass X-ray binary pulsar OAO 1657-415. A short observation near mid-eclipse caught the source in a low-intensity state, with a weak continuum and iron emission dominated by the 6.4-keV fluorescent line. A later, longer observation found the source in a high-intensity state and covered the uneclipsed through mid-eclipse phases. In the high-intensity state, the non-eclipse spectrum has an absorbed continuum component due to scattering by material near the pulsar and 80 per cent of the fluorescent iron emission comes from less than 19 lt-sec away from the pulsar. We find a dust-scattered X-ray halo whose intensity decays through the eclipse. We use this halo to estimate the distance to the source as 7.1 +/- 1.3 kpc.

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