ACS/HRC imaging of two very bright ultra-luminous X-ray sources {ULXs}

Details ACS/HRC imaging of two very bright ultra-luminous X-ray sources {ULXs} ACS/HRC imaging of two very bright ultra-luminous X-ray sources {ULXs}

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10214s&link_type=abstract

HST Proposal ID #10214

Computer Science

Hst Proposal Id #10214 Hot Stars

Scientific paper

We propose broad- and narrow-band ACS/HRC imaging of two very bright ultraluminous X-ray sources {ULXs} in NGC 4559. Our main objectives are: to identify the optical counterparts; to determine their masses and evolutionary stages; to determine the nature of mass transfer in the ULX systems; to determine the properties of the stellar population in the ULX fields {eg, metal abundance, age}. With these observations, integrated with our Chandra, XMM-Newton, HST/WFPC2 and CHFT data, we will test the models for the nature and mechanisms of formation of the accreting black holes in ULXs. Moreover, one of the two ULXs is in a peculiar star-forming complex: we have suggested that it is an expanding wave of star-formation triggered by a dwarf galaxy plunging through the outer disk of NGC 4559. The ACS observation will also allow us to test this hypothesis.

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