Molecular hydrogen absorption systems in sloan digital sky survey
Monthly Notices of the Royal Astronomical Society, ISSN: 1365-2966, Vol: 440, Issue: 1, Page: 225-239
2014
- 39Citations
- 8Captures
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Article Description
We present a systematic search for molecular hydrogen absorption systems at high redshift in quasar spectra from the Sloan Digital Sky Survey (SDSS)-II Data Release 7 and SDSS-III Data Release 9. We have selected candidates using a modified profile fitting technique taking into account that the Lyα forest can effectively mimic H absorption systems at the resolution of SDSS data. To estimate the confidence level of the detections, we use two methods: a Monte Carlo sampling and an analysis of control samples. The analysis of control samples allows us to define regions of the spectral quality parameter space where H absorption systems can be confidently identified.We find that H absorption systems with column densities logNH > 19 can be detected in only less than 3 per cent of SDSS quasar spectra.We estimate the upper limit on the detection rate of saturated H absorption systems (logNH > 19) in damped Lya (DLA) systems to be about 7 per cent. We provide a sample of 23 confident H absorption system candidates that would be interesting to follow up with high-resolution spectrographs. There is a 1σ r - i colour excess and non-significant A extinction excess in quasar spectra with an H candidate compared to standard DLA-bearing quasar spectra. The equivalent widths of C II, Si II and Al III (but not Fe II) absorptions associated with H candidate DLAs are larger compared to standard DLAs. This is probably related to a larger spread in velocity of the absorption lines in the H-bearing sample. © 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=84897480380&origin=inward; http://dx.doi.org/10.1093/mnras/stu275; http://academic.oup.com/mnras/article/440/1/225/1747400/Molecular-hydrogen-absorption-systems-in-Sloan; http://academic.oup.com/mnras/article-pdf/440/1/225/9383418/stu275.pdf; https://dx.doi.org/10.1093/mnras/stu275; https://academic.oup.com/mnras/article/440/1/225/1747400
Oxford University Press (OUP)
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