Suzaku observations of the 2013 outburst of KS 1947+300

Journal article
(Original article)

Publication Details

Author(s): Ballhausen R, Kühnel M, Pottschmidt K, Furst F, Hemphill PB, Falkner S, Gottlieb AM, Grinberg V, Kretschmar P, Kreykenbohm I, Rothschild RE, Wilms J
Journal: Astronomy & Astrophysics
Publisher: EDP Sciences
Publication year: 2016
Volume: 591
ISSN: 1432-0746


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.

FAU Authors / FAU Editors

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

External institutions with authors

California Institute of Technology (Caltech)
European Space Astronomy Centre (ESAC)
Massachusetts Institute of Technology (MIT)
University of California, San Diego
University of Maryland, Baltimore County

How to cite

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.

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


Last updated on 2019-27-04 at 08:08