Towards a Direct Detection of Warm Gas in Galactic Haloes at Cosmological Distances

Details Towards a Direct Detection of Warm Gas in Galactic Haloes at Cosmological Distances Towards a Direct Detection of Warm Gas in Galactic Haloes at Cosmological Distances

1999-03-22

arxiv.org/abs/astro-ph/9903325v1

Astronomy and Astrophysics

Astrophysics

5 pages, 1 ps figure, TeX, uses mn.tex, accepted for publication in MNRAS Letters

Scientific paper

10.1046/j.1365-8711.1999.02645.x

Recent highly sensitive detections of line emission from extended gas in the local universe demonstrate the feasibility of detecting H$\alpha$ emitting galactic halos out to $z\sim1$. We determine the form of the surface brightness vs. redshift dependence which takes into account UV background evolution. Successful detections will have a major impact on a wide range of fields, in particular, the source of ionization in QSO absorption systems.

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