Updated Position, Flux and Spectrum of XTE J1652-453
ATel #2120; C. B. Markwardt (U. Maryland & NASA/GSFC), A. P. Beardmore (U. Leicester), J. Miller (U. Michigan), J. H. Swank (NASA/GSFC)
on 9 Jul 2009; 09:55 UT
Credential Certification: Craig B. Markwardt (email@example.com)
Subjects: X-ray, Binary, Black Hole, Neutron Star, Transient
XTE J1652-453 continues to be detected in the RXTE PCA monitoring of the
galactic center region (ATEL #2107, #2108). The 2-10 keV fluxes on
2009-07-04.5 and 2009-07-08.4 were 140 mCrab and 134 mCrab respectively.
In pointed observations, the PCA spectrum is similar in shape to previous
reports (ATEL #2107).
Based on an improved analysis of the Swift XRT image, which
was significantly piled up (ATEL #2108), we find a revised
astrometrically corrected X-ray position (using the XRT-UVOT
alignment and matching UVOT field sources to the USNO-B1
catalogue) of R.A. = 16h52m20.33s, Decl. =
-45d20'39.6" (J2000) for the source,
with an estimated 90% error radius of 2.5
The Swift XRT photon counting mode spectrum of 2009-07-03 can be fit
with an absorbed disk blackbody model, with a column density of
(4.1-5.5)E+22 and a color temperature of kT = 0.5-0.7 keV. The absorbed
flux was (4-10)E-9 erg/cm2/s, and an unabsorbed flux of (2.6-3.5)E-8
erg/cm2/s in the 0.5-10.0 keV range. Because of significant pile-up,
there is considerable systematic uncertainty in these figures (a 35
arcsec exclusion radius was used to avoid the heavily piled up region).
For that reason we do not attempt to constrain the high energy
components (i.e. power law or Fe line).
The spectrum is consistent with a stellar-mass black hole in the
canonical high/soft state.
RXTE PCA scan light curve of XTE J1652-453