Using the HST Archive to Study the Optical Counterparts of Chandra X-ray Point Sources

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Hst Proposal Id #9210 Galaxies

Scientific paper

Since it's deployment, the Chandra X-ray Observatory has been returning X-ray images of unparalleled resolution. Chandra observations of nearby galaxies show large numbers of point- like X-ray sources. Most likely, these are X-ray binary stars. However, the true nature of these objects is unknown because there are no optical identifications. We will use the HST archive to retrieve, process and analyze all images in the fields of several Chandra X-ray images of nearby galaxies. There are over 300 images which may be of use. We have retrieved the data from one position in NGC 1399 to use as a test case. These data show that we will be able to find and study the optical counterparts of many of the hundreds of X- ray point sources in our images. We are also submitting companion snapshot proposals to cover X-ray objects not included in the archival data.

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