Monitoring the Spectral Variability of the Ultraluminous X-Ray Source in Holmberg IX

Details Monitoring the Spectral Variability of the Ultraluminous X-Ray Source in Holmberg IX Monitoring the Spectral Variability of the Ultraluminous X-Ray Source in Holmberg IX

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1165s&link_type=abstract

Chandra Proposal ID #04400140

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Chandra Proposal Id #04400140

Scientific paper

1E0953.8+6918 is an ultraluminous X-ray source (ULX) residing in HoIX, a dwarf irregular companion to M81. It is surrounded by an emission nebula which appears to be shock heated. Recent observations indicate an association between ULXs and starburst activity, but HoIX is a gas-poor galaxy, leaving such an interpretation in doubt at least for this source. From our recent studies, we have established that 1E0953.8+6918 is a point source for which we have identified a 21st magnitude optical counterpart. Observations to date show that, like other ULXs, 1E0953.8+6918 shows considerable flux variability on timescales of weeks to months. Here we propose to study the spectral variations with flux in order to better assess the nature of this ULX, and its relation to the surrounding nebula.

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