Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917205f&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #172.05; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the results of a systematic search for signatures of the Intergalactic Medium (IGM) in Quasar spectra of the Sloan Digital Sky Survey (SDSS), focusing on finding intervening absorbers via detection of their OVI doublet.
Here we present the search algorithm, and criteria for distinguishing candidates from spurious Lyman alpha forest lines. In addition, we compare our findings with simulations of the Lyman alpha forest in order to estimate the detectability of OVI doublets over various redshift intervals.
We have obtained a sample of 125 OVI doublet candidates in 112 AGN spectra (out of 3804 objects with redshifts in the accessible range for OVI detection). This sample is further subdivided into 3 groups according to the potential for follow-up of these candidates : we propose to obtain observations of 7 of the candidates with the cleanest signatures for OVI doublets with high signal-to-noise and high resolution in order to better constrain the physical state of the warm/hot component of the IGM at high redshift.
Frank Stephan
Mathur Savita
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