Probing the spectral-temporal states of bright ULXs at different flux levels

Details Probing the spectral-temporal states of bright ULXs at different flux levels Probing the spectral-temporal states of bright ULXs at different flux levels

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..166g&link_type=abstract

XMM-Newton Proposal ID #05043901

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White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Holmberg Ii X-1, Xmm-Newton Proposal 05043901

Scientific paper

We request three 70ks observations of the bright ULX Holmberg II X-1, separated by 2-5 months. We also request two 120ks observations, separated by 2-6 months, of another bright ULX Holmberg IX X-1, thus making a total of 450ks exposure. The primary purpose of these observations is to measure the broad band noise power density spectra (PDS) and X-ray spectral shapes at different flux levels. The existing long observations have provided PDS and X-ray spectra at single epochs and suggest that both these ULXs are likely in the strongly Comptonized very high states. The proposed observations will allow us to define spectral states of ULXs at different flux levels, and make a definitive analogy between spectral states of ULXs and the well studied Galactic black hole X-ray binaries (BHBs).

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