Molecular Absorption Lines in Galaxies
نویسندگان
چکیده
منابع مشابه
The Connection between Galaxies and Intergalactic Absorption Lines at Redshift
Absorption-line spectroscopy of 23 background QSOs and numerous background galaxies has let us measure the spatial distribution of metals and neutral hydrogen around 1044 UV-selected galaxies at redshifts 1.8 < ∼ z < ∼ 3.3. The typical galaxy is surrounded to radii r ∼ 40 proper kpc by gas that has a large velocity spread (∆v > 260 km s) and produces very strong absorption lines (NCIV ≫ 10 14 c...
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The galaxy-IGM part of the Lyman-break survey currently consists of measured redshifts for more than 1000 galaxies with redshift 1.5 < ∼ z < ∼ 3.5 along the sightlines to 25 background QSOs. One of the goals of the survey was to measure the influence on the intergalactic medium of energetic feedback from star and black-hole formation. This talk begins with a description of the observed correlat...
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In the local universe, most QSO absorption-lines seem to arise from gas in extended 100 kpc halos around spiral galaxies. We present evidence that at high redshift, at least some absorption lines come from diierent sources: the gas is associated not with spiral galaxy halos but with the intra-cluster medium of proto-galaxy clusters. This gas, which is neutral and lumpy, may form a true intra-cl...
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The four known molecular absorption line systems at redshifts z=0.25–0.89 are discussed. Two of the systems originate in the galaxy hosting the ‘background’ AGN, while in two cases the absorption occurs in truely intervening galaxies. Indirect evidence for the existence of very small scale structure in the molecular ISM is presented. A new absorption line at z=0.89 towards PKS1830–211 opens up ...
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Twenty-two powerful radio galaxies have been searched for HI absorption. We find the highest probability of detecting HI in absorption among narrow-line compact (or small) galaxies or galaxies with indication of richer interstellar medium (i.e. with ongoing or recent starformation). We discuss the difficulty in the interpretation of the origin of the HI absorption due to the uncertainty in the ...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 2005
ISSN: 1539-2996
DOI: 10.1017/s1539299600017287