The Synergy of Ultraviolet QSO Absorption Spectroscopy and 21 cm Emission Studies

Details The Synergy of Ultraviolet QSO Absorption Spectroscopy and 21 cm Emission Studies The Synergy of Ultraviolet QSO Absorption Spectroscopy and 21 cm Emission Studies

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1035...63t&link_type=abstract

THE EVOLUTION OF GALAXIES THROUGH THE NEUTRAL HYDROGEN WINDOW. AIP Conference Proceedings, Volume 1035, pp. 63-67 (2008).

Computer Science

Origin And Formation Of The Universe, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Galaxy Clusters, Spectroscopy And Spectrophotometry, Ultraviolet

Scientific paper

The H I 21 cm transition provides a valuable and unique probe of the roles that gas plays in galaxy evolution and cosmology, and our understanding of these roles is far from complete. This talk discussed the synergy obtained by combining 21 cm observations with ultraviolet measurements of QSO absorption lines. In some respects, QSO absorption spectroscopy provides a much more sensitive tool for the study of intergalactic and interstellar gases-QSO absorption is six orders of magnitude more sensitive to NHI than 21 cm emission, and absorption spectroscopy reveals a rich array of metals including low-, intermediate-, and high-ionization stages and even various molecules-but the UV absorption data only probes the pencil beam to the background QSO. This brief contribution provides an example of how the combination of UV absorption spectroscopy and 21 cm emission provides a more complete picture of the nature of the gas.

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