Discovery of a magnetic neutron star in X-ray transient IGR J01583+6713
Abstract
Aims: IGR J01583+6713 is a new transient source discovered by the INTEGRAL/IBIS hard X-ray surveys. Optical observations have provided evidence that it is a high mass X-ray binary, but its nature remains unclear.
Methods: We used the INTEGRAL/IBIS data to study IGR J01583+6713 during its outburst.
Results: We present the temporal profiles and spectral properties of IGR J01583+6713 around its outburst on 2005 Dec. 6. During the outburst, the mean X-ray luminosity reached around 4 × 1035 erg s-1 in the energy range of 20-100 keV. The continuum spectrum can be fitted by a bremsstrahlung model of kT ~ 35 keV or a power-law model of Γ ~ 2.1. In addition, the electron resonant cyclotron absorption lines were detected at ∼ 35 keV and possible at ∼ 67 keV, implying that a magnetic neutron star of B ~ 4 × 1012 G is located in IGR J01583+6713. We class IGR J01583+6713 as a transient X-ray sources with a magnetic neutron star. After the outburst, the flux of IGR J01583+6713 decreased and could not be detected by IBIS after 2005 Dec. 10. During the outburst, we cannot confirm the possible pulse period at 469 s previously reported and did not detect the modulation signals in the range of 200-2000 s with the IBIS observations.
Conclusions: The transient hard X-ray source IGR J01583+6713 contains a magnetic neutron star, which would help to understand its transient nature.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2010
- DOI:
- 10.1051/0004-6361/200913196
- arXiv:
- arXiv:0912.0337
- Bibcode:
- 2010A&A...516A..15W
- Keywords:
-
- stars: individual: IGR J01583+6713;
- stars: neutron;
- binaries: general;
- X-rays: binaries;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 6 pages, 8 figures, 2 tables, to be published in Astron. Astrophys.