Spectral and temporal properties of the supergiant fast X-ray transient IGR J18483-0311 observed by INTEGRAL
Ducci L, Doroshenko V, Sasaki M, Santangelo A, Esposito P, Romano P, Vercellone S (2013)
Publication Status: Published
Publication Type: Journal article
Publication year: 2013
Journal
Publisher: EDP SCIENCES S A
Book Volume: 559
DOI: 10.1051/0004-6361/201322299
Abstract
Context. IGR J18483-0311 is a supergiant fast X-ray transient whose
compact object is located in a wide (18.5 d) and eccentric (e ~ 0.4)
orbit, which shows sporadic outbursts that reach X-ray luminosities of
~1036 erg s-1.
Aims: We investigated the
timing properties of IGR J18483-0311 and studied the spectra during
bright outbursts by fitting physical models based on thermal and bulk
Comptonization processes for accreting compact objects.
Methods: We
analysed archival INTEGRAL data collected in the period 2003-2010,
focusing on the observations with IGR J18483-0311 in outburst. We
searched for pulsations in the INTEGRAL light curves of each outburst.
We took advantage of the broadband observing capability of INTEGRAL for
the spectral analysis.
Results: We observed 15 outbursts, seven of
which we report here for the first time. This data analysis almost
doubles the statistics of flares of this binary system detected by
INTEGRAL. A refined timing analysis did not reveal a significant
periodicity in the INTEGRAL observation where a ~21 s pulsation was
previously detected. Neither did we find evidence for pulsations in the
X-ray light curve of an archival XMM-Newton observation of IGR
J18483-0311. In the light of these results the nature of the compact
object in IGR J18483-0311 is unclear. The broadband X-ray spectrum of
IGR J18483-0311 in outburst is well fitted by a thermal and bulk
Comptonization model of blackbody seed photons by the infalling material
in the accretion column of a neutron star. We also obtained a new
measurement of the orbital period using the Swift/BAT light curve.
Authors with CRIS profile
Involved external institutions
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
Italy (IT)
Eberhard Karls Universität Tübingen
Germany (DE)
Italy (IT)
Eberhard Karls Universität Tübingen
Germany (DE)
How to cite
APA:
Ducci, L., Doroshenko, V., Sasaki, M., Santangelo, A., Esposito, P., Romano, P., & Vercellone, S. (2013). Spectral and temporal properties of the supergiant fast X-ray transient IGR J18483-0311 observed by INTEGRAL. Astronomy & Astrophysics, 559. https://doi.org/10.1051/0004-6361/201322299
MLA:
Ducci, L., et al. "Spectral and temporal properties of the supergiant fast X-ray transient IGR J18483-0311 observed by INTEGRAL." Astronomy & Astrophysics 559 (2013).
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