X-ray Properties of Black Hole Candidate XTE J1752-223 during its 2009-10 Outburst

Galactic black hole candidate XTE J1752-223 was discovered on 2009 Oct. 21 by the Rossi X-ray Timing Explorer (RXTE). This source belongs to a class of short orbital period objects, which generally do not show soft state during their outburst. We studied both the temporal and spectral properties of the source under two component advective flow (TCAF) paradigm. Properties of X-ray intensity variation, hardness-ratio, low-frequency quasi-periodic oscillations (QPOs) are studied. The spectral analysis is made using the phenomenological disk black body plus power-law (DBB+PL) and with the physical TCAF models. TCAF model fitting gives us the estimate of physical flow parameters such as two types of accretion (Keplerian and sub-Keplerian) rates, shock location, compression ratio, the mass of the BH. Based on the variation of the spectral and temporal features, we have designated the entire outburst of the source into four spectral states: hard (HS), hard-intermediate (HIMS), soft-intermediate (SIMS), soft (SS). Although there is an indication of the soft spectral states from the observation of high disk rate during the middle phase of the outburst, we have not been able to pin-point transition dates from SIMS to SS or vice-verse in both the rising and declining periods. Also, there is some contradiction, such as low PL index (<2.3), observation of radio flux (during entire outburst), etc. for defining the middle phase of the outburst as SS. We check the percentage of fraction of the disk (soft) flux with respect to the total flux in 2.5-20 keV energy band by using the DBB+PL model. We also estimate the integrated power continuum (r) in 0.1-10 Hz from the power density spectra (PDS). Based on these results, we designate that phase of the outburst as a mixed state of 'SIMS or SS'. We also estimate the probable mass of the black hole to be in the range of 8.1 - 11.9 Solar mass, and more precisely, the mass appears to be is 10 ± 1.9 Solar mass. Since the source was active in jets during the entire outburst phase, we estimated X-ray contribution of jets or outflow from TCAF model fitted spectra and studied its properties via the correlation between radio and different component (total, accretion disk and jet) of X-ray fluxes. We found that radio and jet X-ray correlation index in the range of standard correlation indices (0.6-0.7).