Lyman α emission from galaxies at low and high redshift

Details Lyman α emission from galaxies at low and high redshift Lyman α emission from galaxies at low and high redshift

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..408..413k&link_type=abstract

The ultraviolet universe at low and high redshift. AIP Conference Proceedings, Volume 408, pp. 413-417 (1997).

Computer Science

Characteristics And Properties Of External Galaxies And Extragalactic Objects, Atomic, Molecular, Chemical, And Grain Processes, Ultraviolet

Scientific paper

We compare Lyman α emission from star-forming galaxies in the local Universe and at z=2.4, using Voyager 2 UVS data for M33 and HST observations in the 53W002 cluster at z=2.4. Hα comparison data at high redshift are presented from the IRTF with tunable narrow-band filter. M33 shows Lyman α emission with global equivalent width 60 Å, and a Lyα/Hα ratio near 1.5. The one-dimensional spatial profile shows that the Lyman emission does not come from the giant HII region NGC 604, from which we suggest that the diffuse interstellar medium may be the immediate source of most of the Lyman α emission in such galaxies. Our current limits at high redshift show Lyα/Hα>3 for star-forming objects. We briefly consider what kinds of local objects we should compare to the compact, blue emission-line objects found at high redshift.

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