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Bellm, EC, Barrière, NM, Bhalerao, V, Boggs, SE, Cenko, SB, Christensen, FE, Craig, WW, Forster, K, Fryer, CL, Hailey, CJ, Harrison, FA, Horesh, A, Kouveliotou, C, Madsen, KK, Miller, JM, Ofek, EO, Perley, DA, Rana, VR, Reynolds, SP, Stern, D , Tomsick, JA and Zhang, WW (2014) X-ray spectral components observed in the afterglow of GRB 130925A. The Astrophysical Journal Letters, 784 (2). ISSN 2041-8205
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Abstract
We have identified spectral features in the late-time X-ray afterglow of the unusually long, slow-decaying GRB 130925A using NuSTAR, Swift/X-Ray Telescope, and Chandra. A spectral component in addition to an absorbed power law is required at >4σ significance, and its spectral shape varies between two observation epochs at 2 × 105 and 106 s after the burst. Several models can fit this additional component, each with very different physical implications. A broad, resolved Gaussian absorption feature of several keV width improves the fit, but it is poorly constrained in the second epoch. An additive blackbody or second power-law component provide better fits. Both are challenging to interpret: the blackbody radius is near the scale of a compact remnant (108 cm), while the second power-law component requires an unobserved high-energy cutoff in order to be consistent with the non-detection by Fermi/Large Area Telescope. © 2014. The American Astronomical Society. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 0201 Astronomical And Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society |
| Date Deposited: | 18 May 2017 10:20 |
| Last Modified: | 17 May 2022 09:49 |
| DOI or ID number: | 10.1088/2041-8205/784/2/L19 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/6471 |
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