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RXTE Observations of the 1A 1118-61 in an Outburst, and the Discovery of a Cyclotron LineWe present the analysis of RXTE monitoring data obtained during the January 2009 outburst of the hard X-ray transient IA 1118-61. Using these observations the broadband (3.5-120 keV) spectrum of the source was measured for the first time ever. We have found that the broadband continuum spectrum of the source is similar to other accreting pulsars and is well described by several conventionally used phenomenological models. We have discovered that regardless of the applied continuum model, a prominent broad absorption feature at approx. 55 keV is observed. We interpret this feature as a Cyclotron Resonance Scattering Feature (CRSF). The observed CRSF energy is one of the highest known and corresponds to a magnetic field of B approx. 4.8 x 10(exp 12) G in the scattering region. Furthermore, our data suggests an iron emission line presence, which was not reported previously for lA 1118-61 as well. Timing properties of the source, including a strong spin-up, were found to be similar to those observed by CGRO/BATSE during the previous outburst, however the broadband capabilities of RXTE reveal a more complicated energy dependency of the pulse-profile.
Document ID
20100024532
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Doroshenko, V.
(Institute for Astronomy and Astrophysics Tubingen,, Germany)
Suchy, S.
(California Univ. San Diego, CA, United States)
Santangelo, A
(Institute for Astronomy and Astrophysics Tubingen,, Germany)
Staubert, R.
(Institute for Astronomy and Astrophysics Tubingen,, Germany)
Kreykenbohm, I.
(Remeis Sternwarte Bamberg, Germany)
Rothschild, R.
(California Univ. San Diego, CA, United States)
Pottschmidt, K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wilms, J.
(Remeis Sternwarte Bamberg, Germany)
Date Acquired
August 24, 2013
Publication Date
May 10, 2010
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other

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