Chandra Detection of OVIII Lyman-alpha Absorption from the Intergalactic Medium

Details Chandra Detection of OVIII Lyman-alpha Absorption from the Intergalactic Medium Chandra Detection of OVIII Lyman-alpha Absorption from the Intergalactic Medium

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19916103f&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #161.03; Bulletin of the American Astronomical Society, Vol. 34, p.572

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the first detection of an O 8 Lyα absorption line associated with a possible intervening, spiral-rich galaxy group along the sightline towards PKS 2155-304 with the Chandra LETG-ACIS. We constraint the intragroup gas that gives rise to this absorption line to a baryon density in the range 1.7 x 10-5 < nb < 2x 10-4 cm-3 and a temperature of 4-5*E6 K. The estimated physical states of absorption material are in accordance with those of the warm/hot intergalactic medium (WHIM) that is predicted from hydrodynamic simulations. Extroplating from this single detection implies a large fraction of the ``missing baryons'' ( ~ 70% of the WHIM) are probed by the O 8 absorber.

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