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

Astronomy & Astrophysics EDP Sciences

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

Ralf Ballhausen Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Matthias Bissinger Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Sebastian Falkner Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Ingo Kreykenbohm Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Jörn Wilms Professur für Astronomie und Astrophysik

Involved external institutions

University of California, San Diego US United States (USA) (US) European Space Astronomy Centre (ESAC) ES Spain (ES) Massachusetts Institute of Technology (MIT) US United States (USA) (US) University of Maryland, Baltimore County US United States (USA) (US) California Institute of Technology (Caltech) US United States (USA) (US)

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://dx.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).

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