The Lyman continuum radiation from galaxies

Details The Lyman continuum radiation from galaxies The Lyman continuum radiation from galaxies

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8180d&link_type=abstract

HST Proposal ID #8180

Computer Science

Hst Proposal Id #8180 Interstellar And Intergalactic Matter

Scientific paper

The amount of ionizing radiation released into the intergalactic medium by star formation is a poorly known but crucial parameter. This parameter would tell how the galaxies can complement the contribution of quasars for ionizing the IGM, especially at the epoch of re-ionization when the number density of quasars appears to decline. Direct measurements of the Lyman continuum radiation from galaxies are difficult and scarce. Indirect evaluations using models or theoretical arguments are plagued by the uncertainties on the Lyman continuum {Lyc} escape fraction. We would like to take advantage of the ultraviolet sensitivity of the G140L grating of STIS to detect {or set significant upper limit on} the Lyc radiation of star-forming galaxies in the redshift range 0.35 - 0.6. We have selected 4 objects with an H Beta flux {or equivalent} that warrants the detection of a Lyc escape fraction as low as 5 percent. Following TAC's recommendations, we plan to observe three of these o bjects.

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