Determining the Nature of the Peculiar X-ray Transient IGR J16358-4726

Details Determining the Nature of the Peculiar X-ray Transient IGR J16358-4726 Determining the Nature of the Peculiar X-ray Transient IGR J16358-4726

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1360k&link_type=abstract

Chandra Proposal ID #04408146

Computer Science

Chandra Proposal Id #04408146

Scientific paper

IGR J16358-4726 was discovered on 03/19 2003. Our March 24 CXO observation serendipitously detected the transient at the 1.7e-10 erg/cm^2 s flux level (unabsorbed) with a very high absorption column (NH=3.3e23 cm^-2). The spectrum is a hard power law of index 0.5; we see a significant Fe line and possibly Ni line. A strong flux modulation with a period of 5860s is clearly visible in the data. The frequency of this modulation appears to change within the observation. The only neutron star systems known with similar spin periods are low luminosity persistent wind-fed pulsars; if this is a spin period, this transient is a new kind of object. If this is an orbital period, then the system could be a compact LMXB. We request follow up CXO observations to quantify short term changes in the 5860s periodicity and perform phase resolved spectroscopy.

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