Black hole candidate XTE J1752-223: Swift observations of canonical states during outburst

Abstract

We present Swift broadband 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 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. We offer a purely 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. 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 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.

8 pages, 8 figures; MNRAS in press

References in corpus (7)

• The Second-Generation Guide Star Catalog: Description and Properties
• Paper II: Calibration of the Swift ultraviolet/optical telescope
• Global optical/infrared - X-ray correlations in X-ray binaries: quantifying disc and jet contributions
• Evolution of the radio - X-ray coupling throughout an entire outburst of Aquila X-1
• Further Evidence for Variable Synchrotron Emission in XTE J1118+480 in Outburst
• Parallel tracks in infrared versus X-ray emission in black hole X-ray transient outbursts: a hysteresis effect?
• The hard state of black hole candidates: XTE J1752-223

Cited by in corpus (17)

• WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
• The X-ray Spectral Evolution of Galactic Black Hole X-ray Binaries Toward Quiescence
• Jet spectral breaks in black hole X-ray binaries
• The black hole candidate XTE J1752-223 towards and in quiescence: optical and simultaneous X-ray - radio observations
• XTE J1752-223 in outburst: a persistent radio jet, dramatic flaring, multiple ejections and linear polarisation
• An accurate position for the black hole candidate XTE J1752-223: re-interpretation of the VLBI data
• Discovery and Monitoring of a new Black Hole Candidate XTE J1752-223 with RXTE: RMS spectrum evolution, BH mass and the source distance
• A decelerating jet observed by the EVN and VLBA in the X-ray transient XTE J1752-223
• The INTEGRAL view on Black Hole X-ray Binaries
• A Spectral Study of the Black Hole Candidate XTE J1752-223 in the High/Soft State with MAXI, Suzaku and Swift
• A late jet rebrightening revealed from multi-wavelength monitoring of the black hole candidate XTE J1752-223
• Transient Relativistic Ejections and Stationary Core in XTE J1752-223
• Inference on Accretion Flow Properties of XTE J1752-223 During Its 2009-10 Outburst
• Multiwavelength observations of the black hole transient XTE J1752-223 during its 2010 outburst decay
• Swift XRT Timing Observations of the Black-Hole Binary SWIFTJ1753.5-0127: Disk-Diluted Fluctuations in the Outburst Peak
• Quiescent NIR and optical counterparts to candidate black hole X-ray binaries
• The X-ray Transient 2XMMi J003833.3+402133: A Candidate Magnetar at High Galactic Latitude