4U 1909+07: A HIDDEN PEARL

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https://www.aanda.org/articles/aa/full_html/2011/01/aa15636-10/aa15636-10.html

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https://doi.org/10.1051/0004-6361/201015636
 http://hdl.handle.net/11603/29877

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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UMBC Physics Department

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https://orcid.org/0000-0002-4656-6881

Date

2011-01-01

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journal articles
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Citation of Original Publication

Fürst, F., I. Kreykenbohm, S. Suchy, L. Barragán, J. Wilms, R. E. Rothschild, and K. Pottschmidt. “4U 1909+07: A Well-Hidden Pearl.” Astronomy & Astrophysics 525 (January 1, 2011): A73. https://doi.org/10.1051/0004-6361/201015636.

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Abstract

We present a detailed spectral and timing analysis of the High Mass X-ray Binary (HMXB) 4U1909+07 with INTEGRAL and RXTE. 4U1909+07 is a persistent accreting X-ray pulsar with a period of approximately 605s. The period changes erratically consistent with a random walk expected for a wind accreting system. INTEGRAL detects the source with an average of 2.4cps (corresponding to 15mCrab), but sometimes exhibits flaring activity up to 50cps (i.e. 300mCrab).The strongly energy dependent pulse profile shows a double peaked structure at low energies and only a single narrow peak at energies above 20keV. The phase averaged spectrum is well described by a power law modified at higher energies by an exponential cutoff and photoelectric absorption at low energies. In addition at 6.4keV a strong iron fluorescence line and at lower energies a blackbody component are present. We performed phase resolved spectroscopy to study the pulse phase dependence of the spectral parameters: while most spectral parameters are constant within uncertainties, the blackbody normalization and the cutoff folding energy vary strongly with phase.