Staring at 4U 1909+07 with Suzaku

Fürst F, Pottschmidt K, Kreykenbohm I, Müller S, Kühnel M, Wilms J, Rothschild RE (2012)

Publication Status: Published

Publication Type: Journal article

Publication year: 2012

Journal

Astronomy & Astrophysics EDP Sciences

Publisher: EDP SCIENCES S A

Book Volume: 547

Article Number: ARTN A2

DOI: 10.1051/0004-6361/201219845

Abstract

We present an analysis of the neutron star high mass X-ray binary (HMXB) 4U 1909+07 mainly based on Suzaku data. We extend the pulse period evolution, which behaves in a random-walk like manner, indicative of direct wind accretion. Studying the spectral properties of 4U 1909+07 between 0.5 to 90 keV we find that a power-law with an exponential cutoff can describe the data well, when additionally allowing for a blackbody or a partially covering absorber at low energies.We find no evidence for a cyclotron resonant scattering feature (CRSF), a feature seen in many other neutron star HMXBs sources. By performing pulse phase resolved spectroscopy we investigate the origin of the strong energy dependence of the pulse profile, which evolves from a broad two-peak profile at low energies to a profile with a single, narrow peak at energies above 20 keV. Our data show that it is very likely that a higher folding energy in the high energy peak is responsible for this behavior. This in turn leads to the assumption that we observe the two magnetic poles and their respective accretion columns at different phases, and that these accretion columns have slightly different physical conditions.

Authors with CRIS profile

Felix Fürst Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Ingo Kreykenbohm Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Sebastian Müller Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Matthias Bissinger Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Jörn Wilms Professur für Astronomie und Astrophysik

Involved external institutions

National Aeronautics and Space Administration (NASA) US United States (USA) (US) University of California, San Diego US United States (USA) (US)

How to cite

APA:

Fürst, F., Pottschmidt, K., Kreykenbohm, I., Müller, S., Kühnel, M., Wilms, J., & Rothschild, R.E. (2012). Staring at 4U 1909+07 with Suzaku. Astronomy & Astrophysics, 547. https://doi.org/10.1051/0004-6361/201219845

MLA:

Fürst, Felix, et al. "Staring at 4U 1909+07 with Suzaku." Astronomy & Astrophysics 547 (2012).

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