Probing the Voids - II - Carryover

Details Probing the Voids - II - Carryover Probing the Voids - II - Carryover

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5715s&link_type=abstract

HST Proposal ID #5715

Physics

Hst Proposal Id #5715 Quasars &Amp, Agn Quasar Absorption

Scientific paper

We propose to obtain medium-resolution GHRS (G160M) exposures of 4 AGNs behind two well-studied galaxy voids (Coma and Perseus) to search for H I (Lyman-alpha) absorption systems with equivalent width greater than 50 mA. A detection of HI absorbers within galaxy voids will help resolve a basic question of whether the 3C-273 H I absorbers are survivors from the high redshift population or are recently formed (ejected?) due to starburst activity in nearby galaxies. These observations will also increase our knowledge of the clustering properties of the surprising low-z H I systems. Based on the line density seen by GHRS toward 3C-273 (one Ly-alpha system per 4000 km/s of pathlength) we expect to observe at least 4 absorbers (EW greater than 50 mA) within 16,000 km/s of pathlength through the two galaxy voids. We may actually see more absorbers if the H I clouds are more frequent within voids. Theoretical scenarios for the production and confinement of intergalactic Ly-alpha clouds predict that this might be the case. Only HST, with its UV sensitivity, can find out.

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