Effective absorbing column density in the gamma-ray burst afterglow X-ray spectra
Monthly Notices of the Royal Astronomical Society, ISSN: 1365-2966, Vol: 441, Issue: 4, Page: 3634-3639
2014
- 9Citations
- 12Captures
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Article Description
We investigate the scaling relation between the observed amount of absorption in the X-ray spectra of gamma-ray burst afterglows and the absorber redshift. Through dedicated numerical simulations of an ideal instrument, we establish that this dependence has a power-law shape with index 2.4. However, for real instruments, this value depends on their low-energy cut-off, spectral resolution and on the detector spectral response in general.We thus provide appropriate scaling laws for specific instruments. Finally,we discuss the possibility to measure the absorber redshift from X-ray data alone.We find that 10-10 counts in the 0.3-10 keVband are needed to constrain the redshift with 10 per cent accuracy. As a test case, we discuss the XMM-Newton observation of GRB 090618 at z = 0.54. We are able to recover the correct redshift of this burst with the expected accuracy. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84903167892&origin=inward; http://dx.doi.org/10.1093/mnras/stu831; http://academic.oup.com/mnras/article/441/4/3634/1229551/Effective-absorbing-column-density-in-the-gammaray; http://academic.oup.com/mnras/article-pdf/441/4/3634/4059110/stu831.pdf; https://dx.doi.org/10.1093/mnras/stu831; https://academic.oup.com/mnras/article/441/4/3634/1229551
Oxford University Press (OUP)
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