RXTE/PCA observations of the black hole binary candidate XTE J1856+053
ATel #1038; K. Yamaoka (Aoyama Gakuin University), T. Dotani (ISAS/JAXA) and J. H. Swank (NASA/GSFC)
on 31 Mar 2007; 18:42 UT
Credential Certification: Kazutaka Yamaoka (yamaoka@phys.aoyama.ac.jp)
Subjects: X-ray, Binary, Black Hole, Transient
We performed two RXTE pointing observations of the black hole
binary candidate XTE J1856+053 (ATels #1024,#1026), on March 9 and 24.
Energy spectra of both sets of observations are quite similar.
The PCA spectra are well fit with a multi-color disk (MCD) model with
Tin = 0.72+-0.02 keV plus a power-law with a photon index gamma =
2.0+-0.5, modified with Galactic absorption (fixed at the Galactic
value NH = 3.3e22 cm^-2). The fluxes in the 2-10 keV range were
1.3e-9 erg/cm^2/s, corresponding to about 56 mCrab, for both
observations. These results are typical of black hole sources in a
high/soft state. They also indicate that the XTE J1856+053 stayed at
an approximately constant flux level for a few weeks after its rise on
March 5 (ATel #1024).
