Mathematics – Logic
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0608n&link_type=abstract
American Astronomical Society, HEAD meeting #11, #6.08; Bulletin of the American Astronomical Society, Vol. 41, p.659
Mathematics
Logic
Scientific paper
I will review current evidence for the X-ray, hot component of the Warm-Hot intergalactic Medium (WHIM), which should contain up to 90% of the WHIM (the remaining 10% being cooler and so also detectable in the Far-UV through Li-like metals).
I will show that all evidence gathered so far are either low statistical significance, low-confidence identifications (mostly because single-line detections), and most importantly lack a secure HI counterpart, without which no metallicity correction and so cosmological mass density estimate is possible.
I will then present the first tentative identification of one such HI-plus-metal WHIM detection, along the line of sight to the Seyfert galaxy PKS 0558-504.
This possible identification allows us to measure for the first time the metallicity of a WHIM system, which turns out to be in the range 1-4% Solar, in good agreement with theoretical predictions.
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