Atomic and Molecular Absorption at High Redshift

Details Atomic and Molecular Absorption at High Redshift Atomic and Molecular Absorption at High Redshift

2003-10-23

arxiv.org/abs/astro-ph/0310672v2

Astronomy and Astrophysics

Astrophysics

4 pages, to appear in The Neutral ISM in Starburst Galaxies, ASP Conference Series, 2003, edited by S. Aalto, S. Huettemeister

Scientific paper

Strong constraints on possible variations in fundamental constants can be derived from HI 21-cm and molecular rotational absorption lines observed towards quasars. With the aim of forming a statistical sample of constraints we have begun a program of systematic searches for such absorption systems. Here we describe molecular rotational searches in 25 damped Lyman-alpha systems where, in many cases, we set optical depth limits an order of magnitude better than that required to detect the 4 known redshifted millimeter-wave absorbers. We also discuss the contributory factors in the detectability of HI 21-cm absorption, focusing on possible biases (e.g.low covering factors) in the currently known sample of absorbers and non-detections.

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