Issue |
A&A
Volume 420, Number 2, June III 2004
|
|
---|---|---|
Page(s) | 589 - 594 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20035940 | |
Published online | 28 May 2004 |
XMM-Newton observations of the INTEGRAL X-ray transient IGR J17544-2619
1
XMM-Newton Science Operation Centre, ESA, VILSPA, PO Box 50727, 28080 Madrid, Spain
2
INTEGRAL Science Operations Centre, Science Operations and Data Systems Division, Research and Scientific Support Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
3
Astrophysics Missions Division, Research and Scientific Support Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
Corresponding author: R. González-Riestra, rgonzale@xmm.vilspa.esa.es
Received:
17
November
2003
Accepted:
12
February
2004
On September 17, 2003 INTEGRAL discovered a bright
transient source 3° from the Galactic Center, IGR J17544-2619. The
field containing the transient was observed by XMM-Newton on March 17
and September 11 and 17, 2003. A bright source, at a position
consistent with the INTEGRAL location, was detected by the European
Photon Imaging Camera (EPIC) during both September observations with
mean 0.5-10 keV unabsorbed luminosities of and
erg s-1 for an (assumed) distance of 8 kpc. The source was not detected in March 2003, with a 0.5-10 keV
luminosity of <
erg s-1. The September 11 and 17 EPIC spectra can be represented by a power-law model with
photon indices of
and
, respectively. Thus,
the 0.5-10 keV spectrum hardens with increasing intensity. The
low-energy absorption during both September observations is comparable
to the interstellar value. The X-ray lightcurves for both September
observations show energy dependent flaring which may be modeled by
changes in either low-energy absorption or power-law index.
Key words: accretion, accretion disks / X-rays: individuals: IGR J17544-2619 / stars: neutron / X-rays: binaries
© ESO, 2004
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