Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9166z&link_type=abstract
HST Proposal ID #9166
Computer Science
Hst Proposal Id #9166 Agn/Quasars
Scientific paper
Host galaxies of high-redshift, powerful radio sources are likely the progenitors of present-day gE and cD galaxies, and therefore provide important laboratories in which to investigate the formation of massive galaxies in the early Universe. At z gt 2, many high-redshift radio galaxies {HzRGs} exhibit giant, { 100 kpc-size} Ly-alpha halos; similar nebulae without associated radio sources have recently been discovered in a galaxy overdensity at z = 3.09 {Steidel et al. 1999}. The LyAlpha luminosity of these halos { 10^44 erg s^-1} is comparable to the total X-ray luminosities of low-z X-ray clusters, and may reflect the hot, cooling gas reservoir from which the galaxy/cluster is forming. Although these halos are easily observable in z gt 2 HzRGs {LyAlpha is redshifted into the optical window}, their redshift evolution has not yet been studied, primarily because the LyAlpha emission in the z<1.8 galaxies lies at UV wavelengths inaccessible to ground-based telescopes. We propose to use STIS on HST to search for Ly-alpha halos around giant radio galaxies and in rich cluster environments at z 1. This will test both their redshift evolution {are they unique to the youngest phases of galaxy formation?} and their association with dense cluster environments.
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