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

Peter A. Curran, T. J. Maccarone, P. Casella

Research output: Contribution to journalConference articlepeer-review


Here we summarise the Swift broadband observations of the recently discovered X-ray transient and black hole candidate, XTEJ1752-223, obtained over the period of outburst from October 2009 to June 2010. 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, confirming the spectral states. From Swift-UVOT data we confirm the presence of an optical counterpart which displays variability correlated, in the soft state, to the X-ray 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 rising hard state. Our XRT timing analysis shows that in the hard state there is significant variability below 10 Hz which is more pronounced at low energies, while during the soft state the level of variability is consistent with being minimal. These properties of XTE J1752-223 support its candidacy as a black hole in the Galactic centre region.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2010
Event8th INTEGRAL Workshop on the Restless Gamma-Ray Universe, INTEGRAL 2010 - Dublin Castle, Dublin, Ireland
Duration: Sep 27 2010Sep 30 2010


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