Probing the enigmatic nature of ULXs in NGC1313 with XMM-Newton

Details Probing the enigmatic nature of ULXs in NGC1313 with XMM-Newton Probing the enigmatic nature of ULXs in NGC1313 with XMM-Newton

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..190d&link_type=abstract

XMM-Newton Proposal ID #04050901

Computer Science

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Ngc1313, Xmm-Newton Proposal 04050901

Scientific paper

We propose a 120ks observation of NGC1313 to investigate the nature of the two ULXs in this galaxy. NGC1313 X-1 and X-2 are amongst only a handful of the brightest and well separated ULXs that show unusual X-ray spectral behavior and provide the best candidates to probe the slim disk regime. For NGC1313 X-1, our present analysis of the existing, short XMM-Newton observations reveal a cool (blackbody kT~0.2keV) soft excess component and a high energy curvature or a cutoff at 7keV; for X-2, these data reveal an unusual spectral transition, possibly from a high/soft or very high state to a higher flux, slim disk (kT~2keV) regime. The observation will not only determine the accurate shape of the energy and power spectra, but also help to probe the soft excess component through rapid spectral variability.

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