Swift observations of black hole candidate, XTE J1752-223, during outburst

Details Swift observations of black hole candidate, XTE J1752-223, during outburst Swift observations of black hole candidate, XTE J1752-223, during outburst

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confe...3c&link_type=abstract

"The First Year of MAXI: Monitoring Variable X-ray Sources", 4th International MAXI Workshop held November 30 - December 2, 2010

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We present broadband (0.002-1150keV) Swift observations of the recently discovered black hole candidate, X-ray transient, XTE J1752-223, obtained over the period of outburst from October 2009 to June 2010. From Swift-UVOT data we confirm the presence of an optical counterpart which displays variability correlated, in the soft state, to the Xray emission observed by Swift-XRT. The optical counterpart also displays hysteretical behaviour between the states not normally observed in the optical bands, suggesting a possible contribution from a synchrotron emitting jet to the optical emission in the hard state. We offer a phenomenological treatment of the spectra as an indication of the canonical spectral state of the source during different periods of the outburst. We find that the high-energy hardness-intensity diagrams over two separate bands follows the canonical behavior associated with black hole binaries. Our XRT timing analysis shows that in the hard state there is significant variability below 10Hz which is more pronounced at low energies, while during the soft state the variability is at negligible levels. These properties of XTE J1752-223 support its candidacy as a black hole in the Galactic centre region.

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