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DC Field | Value | Language |
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dc.contributor.author | Yokogawa, J. | - |
dc.contributor.author | Paul, Biswajit | - |
dc.contributor.author | Ozaki, M. | - |
dc.contributor.author | Nagase, F. | - |
dc.contributor.author | Chakrabarty, D. | - |
dc.contributor.author | Takeshima, T. | - |
dc.date.accessioned | 2012-07-14T06:13:46Z | - |
dc.date.available | 2012-07-14T06:13:46Z | - |
dc.date.issued | 2000-08 | - |
dc.identifier.citation | Astrophysical Journal, 2000, Vol. 539, p191-196 | en |
dc.identifier.issn | 0004-637X | - |
dc.identifier.issn | 1538-4357 (Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/4888 | - |
dc.description | Open Access | en |
dc.description.abstract | The new transient X-ray pulsar XTE J0111.2-7317 was observed with Advanced Satellite for Cosmology and Astrophysics (ASCA) on 1998 November 18, a few days after its discovery with the proportional counter array on board the Rossi X-ray Timing Explorer. The source was detected at a flux level of 3.6×10-10 ergs cm-2 s-1 in the 0.7-10.0 keV band, which corresponds to the X-ray luminosity of 1.8×1038 ergs s-1, if a distance of 65 kpc for this pulsar in the Small Magellanic Cloud is assumed. Nearly sinusoidal pulsations with a period of 30.9497+/-0.0004 s were unambiguously detected during the ASCA observation. The pulsed fraction is low and slightly energy dependent with an average value of ~27%. The energy spectrum shows a large soft excess below ~2 keV when fitted to a simple power-law-type model. The soft excess is eliminated if the spectrum is fitted to an ``inversely broken power-law'' model, in which photon indices below and above a break energy of 1.5 keV are 2.3 and 0.8, respectively. The soft excess can also be described by a blackbody or a thermal bremsstrahlung when the spectrum above ~2 keV is modeled by a power law. In these models, however, the thermal soft component requires a very large emission zone, and hence it is difficult to explain the observed pulsations at energies below 2 keV. A bright state of the source enables us to identify a weak iron line feature at 6.4 keV with an equivalent width of 50+/-14 eV. Pulse phase-resolved spectroscopy revealed a slight hardening of the spectrum and marginal indication of an increase in the iron line strength during the pulse maximum. | en |
dc.language.iso | en | en |
dc.publisher | IOP Publishing Ltd | en |
dc.relation.uri | http://adsabs.harvard.edu/abs/2000ApJ...539..191Y | en |
dc.relation.uri | http://arxiv.org/abs/astro-ph/0003251 | en |
dc.relation.uri | http://dx.doi.org/10.1086/309202 | en |
dc.rights | 2000 The American Astronomical Society | en |
dc.subject | Stars: Binaries | en |
dc.subject | Magellanic Clouds | en |
dc.subject | X-Rays: Stars | en |
dc.title | ASCA observation of the new transient X-Ray pulsar XTE J0111.2-7317 in the small magellanic cloud | en |
dc.type | Article | en |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2000_APJ_V539_p191.pdf Restricted Access | Open Access | 207.71 kB | Adobe PDF | View/Open Request a copy |
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