Strong OVI Absorbers At z<0.5: Galactic, Intragroup, Or Intergalactic Gas?

Details Strong OVI Absorbers At z<0.5: Galactic, Intragroup, Or Intergalactic Gas? Strong OVI Absorbers At z<0.5: Galactic, Intragroup, Or Intergalactic Gas?

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348208l&link_type=abstract

American Astronomical Society, AAS Meeting #213, #482.08; Bulletin of the American Astronomical Society, Vol. 41, p.451

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Scientific paper

Recent cosmological simulations of the low redshift Universe suggest that strong OVI absorbers (log N(OVI)>14.5) are more likely to be collisionally ionized near galactic halos rather than the warm-hot intergalactic medium (WHIM). To test this, we combine FUSE and STIS observations of strong OVI absorbers at z<0.5. For some we have information about the galaxy environments, allowing us to directly study the galaxy-absorber relationship. It appears that strong OVI absorbers associated with Lyman thick absorbers (log N(HI)>16.5) indeed generally trace galactic not intergalactic structures, but strong OVI absorbers with no Lyman thick absorbers are more ambiguous, possibly tracing the WHIM or the cooler photoionized IGM or the extended galactic halos.

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