UV Spectroscopy of M33-X8: mini-AGN or black-hole binary?

Details UV Spectroscopy of M33-X8: mini-AGN or black-hole binary? UV Spectroscopy of M33-X8: mini-AGN or black-hole binary?

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8341c&link_type=abstract

HST Proposal ID #8341

Physics

Hst Proposal Id #8341 Agn Physics

Scientific paper

The nucleus of M33 contains X-8, the most luminous steady X- ray source in the Local Group {Long et al, 1996}. Our ROSAT long-term studies {Dubus et al, 1997} have shown that it exhibits a remarkable 106d periodicity which is similar to the ``super-orbital'' modulations seen in some galactic low-mass X-ray binaries. This indicates that X-8 is a single object, and our recent WFPC2 UV images reveal a 16th magnitude UV source in the centre of the {almost} stellar M33 nucleus. However, the nature of this object cannot be gleaned from optical studies as the nucleus is dominated by a compact stellar core of F integrated spectral type. And with an L_X/L_UV ratio much too low to be typical of an X-ray binary {unless it is an accretion disc corona source}, X-8 is likely to be the nearest example of a ``mini-AGN''. We are therefore applying for STIS far-UV to optical spectroscopy to study this potentially crucial link between X-ray binary behaviour {the periodicity} and that of A GN.

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