Chandra Observations of the Extranuclear Source in UGC 4305

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Chandra Proposal Id #02600091

Scientific paper

The occurrence of luminous extranuclear X-ray sources in normal galaxies has become an established but poorly understood phenomenon. Recently Roberts & Warwick showed that some of these sources have X-ray luminosities reaching ~10E40 erg s-1, however, their nature is still unknown. We propose to use ACIS to observe the star-forming galaxy UGC4305 which has a luminous extranuclear source with an X-ray luminosity of ~10E40 erg s-1 (0.1-2.0keV). This observation will help us to pinpoint its position and see whether it is extended. This will allow us to determine whether it is associated with an X-ray binary embedded in a SNR, as suggested by radio observations. Also comparison with earlier ROSAT observations will allow us to study its long term variability.

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