The Nature of the Lyman Alpha Emission from Galaxies

Details The Nature of the Lyman Alpha Emission from Galaxies The Nature of the Lyman Alpha Emission from Galaxies

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5833l&link_type=abstract

HST Proposal ID #5833

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Hst Proposal Id #5833 Galaxies &Amp, Clusters

Scientific paper

Lyman alpha photons are produced in abundance in HII regions but their escape from galaxies is problematic. This is an important problem as the observed Lyman alpha emission is often used as a tracer of massive star formation in distant galaxies and in searches for protogalaxies. We have recently obtained a GHRS spectrum of the HII galaxy Haro 2 around Lyman alpha and OI 1302Angstrom . We found a neutral galactic wind which produces Lyman alpha and OI absorptions and expands at 150 kms. We also see Lyman alpha in emission but redshifted by 140 kms with respect to the HII region. Either this line peeps out through a hole in the neutral wind, or much more probably the high-velocity photons escape because there is little matter at this velocity, in any case after considerable scattering in the neutral hydrogen. This unique observation opens new insights into the emission of Lyman alpha by galaxies. We now propose to study the profile and measure the relative velocity of the (known) Lyman alpha emission in other HII galaxies with respect to that of the neutral gas in front of the HII region and to that of the HII region itself, using the same method as for Haro 2. Our sample contains 3 galaxies. The comparison between these results should yield a definitive understanding of how Lyman alpha radiation leaves galaxies.

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