STIS Spectroscopy of PKS 0405-123

Details STIS Spectroscopy of PKS 0405-123 STIS Spectroscopy of PKS 0405-123

2003-10-14

arxiv.org/abs/astro-ph/0310384v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, subm Proc XVth Rencontres de Blois, Physical Cosmology

Scientific paper

We present results for QSO PKS 0405-123 (z=0.574, V=14.9), as part of a STIS Investigation Definition Team (IDT) key project to study weak Ly-alpha forest systems at low z. We detect 59 (47) Ly-alpha absorbers at 4.0 sigma significance to an 80% completeness limit of column density log N(HI)=13.3 (13.1) for Doppler parameter V_Dop=40 km/s over 0.002=14.0, but exhibits twice as many systems at 13.1=48 +- 21 km/s; line blending possibly inflates the value. We find evidence for Ly-alpha-Ly-alpha clustering in our sample on a scale of Delta v<=250 km/s, and there is evidence for a void at 0.032=13.1 and 45 galaxies taken from the literature and unpublished data at 0

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