Suzaku observations of the 2013 outburst of KS 1947+300

Ballhausen R, Kühnel M, Pottschmidt K, Furst F, Hemphill PB, Falkner S, Gottlieb AM, Grinberg V, Kretschmar P, Kreykenbohm I, Rothschild RE, Wilms J (2016)


Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Publisher: EDP Sciences

Book Volume: 591

Article Number: A65

DOI: 10.1051/0004-6361/201527193

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, N, over pulse phase. Spectra taken during the pulse profile minima are intrinsically softer compared to the pulse phase-averaged spectrum.

Authors with CRIS profile

Involved external institutions

How to cite

APA:

Ballhausen, R., Kühnel, M., Pottschmidt, K., Furst, F., Hemphill, P.B., Falkner, S.,... Wilms, J. (2016). Suzaku observations of the 2013 outburst of KS 1947+300. Astronomy & Astrophysics, 591. https://doi.org/10.1051/0004-6361/201527193

MLA:

Ballhausen, Ralf, et al. "Suzaku observations of the 2013 outburst of KS 1947+300." Astronomy & Astrophysics 591 (2016).

BibTeX: Download