High resolution UV imaging of M33-X8, the nuclear X-ray source in M33

Details High resolution UV imaging of M33-X8, the nuclear X-ray source in M33 High resolution UV imaging of M33-X8, the nuclear X-ray source in M33

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6694c&link_type=abstract

HST Proposal ID #6694

Physics

Hst Proposal Id #6694 Galaxies &Amp, Clusters

Scientific paper

The nucleus of M33 is known to contain the most luminous steady X-ray source in the Local Group {Long et al.,1981}. Our recent ROSAT observations, however, indicate that the X-ray emission shows peculiar variability at short, less than an hour, timescales. The identification and study of the X-ray source at optical wavelengths is impossible using ground based techniques, as the {almost} stellar nucleus {V 14.9} dominates the flux. However, the nuclear X-ray source has L_X 10^39 erg s^-1, which means that, if it has a typical L_X/L_opt of 500 {a conservative assumption}, the expected V magnitude {at the distance of M33} would be 22. However, most of the optical light comes from late type stars, in a slightly extended core, which means that high resolution far UV imaging with HST provides the only means for identifying M33-X8. This source could be the crucial link between luminous X-ray binaries and ``micro-''AGN, and is by far the closest of its type.

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