X-ray pulsations from the region of the supergiant fast X-ray transient IGR J17544-2619
Abstract
Phase-targeted RXTE observations have allowed us to detect a transient 71.49 ± 0.02 s signal that is most likely to be originating from the supergiant fast X-ray transient IGR J17544-2619. The phase-folded light curve shows a possible double-peaked structure with a pulsed flux of ~4.8 × 10-12 erg cm-2 s-1 (3-10 keV). Assuming the signal to indicate the spin period of the neutron star in the system, the provisional location of IGR J17544-2619 on the Corbet diagram places the system within the classical wind-fed supergiant XRB region. Such a result illustrates the growing trend of supergiant fast X-ray transients to span across both of the original classes of HMXB in Porb - Pspin space.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 2012
- DOI:
- 10.1051/0004-6361/201117947
- arXiv:
- arXiv:1201.2284
- Bibcode:
- 2012A&A...539A..21D
- Keywords:
-
- X-rays: binaries;
- stars: winds;
- outflows;
- pulsars: general;
- X-rays: individuals: IGR J17544;
- 2619;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 7 pages, 6 figures, Accepted for publication in Astronomy and Astrophysics main journal