Broad Band X-ray Spectra of Atoll Source 4U 1636-536: NuSTAR and Swift Results
- Creators
- Agrawal, Vivek Kumar
- Hasan, Mohammad
Abstract
In this work we investigate broad band (1-79 keV) spectral nature of the atoll source 4U 1636-536 using the combined Nu-STAR and SWIFT-XRT data. The spectra are complex and have emission components from the disc, boundary-layer and corona. In addition to that a broad iron line is also observed. A relativistic line model assuming Schwarzchild metric fits this feature. The total flux varies from 1.4 × 10^(−9) to 4.36× 10^(−9)ergs/s/cm^2. At the highest flux level the source was found in the soft state. In this state the Comptonized component has temperature kT_e ∼ 3 keV and optical depth τ ∼ 16. We also detect a non-thermal tail with index ∼ 2.4, contributing ∼ 10 % of the total flux in the soft state. We also find that the inner disc radius, electron temperature and optical depth vary with the total 0.1-100 keV unabsorbed flux. We discuss the implication of the results in this paper.
Additional Information
This research has made use of data and/or software provided by High Energy Astrophysics Science Archive Research Center (HEASARC). We thank Dr. Anil Agarwal, GD, SAG, Mr. Subramanya Udupa. DD, CDA and Dr. M. Annadurai, Director, ISAC for encouragement and continuous support to carry out this research.Attached Files
Submitted - 1611.09004v1.pdf
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Additional details
- Eprint ID
- 72370
- Resolver ID
- CaltechAUTHORS:20161129-092739528
- Created
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2016-11-29Created from EPrint's datestamp field
- Updated
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2023-06-02Created from EPrint's last_modified field
- Caltech groups
- NuSTAR