Suzaku observations of the 2013 outburst of KS 1947+300
Abstract
We report on the timing and spectral analysis of two Suzaku observations with different flux levels of the high-mass X-ray binary KS 1947+300 during its 2013 outburst. In agreement with simultaneous NuSTAR observations, the continuum is well described by an absorbed power law with a cutoff and an additional blackbody component. In addition, we find fluorescent emission from neutral, He-like, and even H-like iron. We determine a pulse period of ~18.8 s with the source showing a spin-up between the two observations. Both Suzaku observations show very similar behavior of the pulse profile, which is strongly energy dependent. This profile has an evolution from a profile with one peak at low energies to a profile with two peaks of different widths toward higher energies seen in both the Suzaku and NuSTAR data. Such an evolution to a more complex profile at higher energies is rarely seen in X-ray pulsars, most cases show the opposite behavior. Pulse phase-resolved spectral analysis shows a variation in the absorbing column density, NH, over pulse phase. Spectra taken during the pulse profile minima are intrinsically softer compared to the pulse phase-averaged spectrum.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2016
- DOI:
- 10.1051/0004-6361/201527193
- arXiv:
- arXiv:1603.00744
- Bibcode:
- 2016A&A...591A..65B
- Keywords:
-
- pulsars: individual: KS 1947+300;
- X-rays: binaries;
- accretion;
- accretion disks;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 9 pages, 10 figures, 2 tables, accepted for publication in A&