Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5975m&link_type=abstract
HST Proposal ID #5975
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Hst Proposal Id #5975 Quasars
Scientific paper
defzsol z_odot defzsun z_odot defL(sun) L_odot defL(sun) L_odot defM(sun) M_odot defM(sun) M_odot We propose to carry out high spatial resolution imaging of two carefully chosen quasars with redshifts greater than four. At these redshifts the angular scales are similar to those at z=0.3 (~10kpc per arcsec for H_0=50, q_0=0.5) and the host galaxies should be both resolvable and detectable in the I(F814W) band (rest frame ~1500ang). We shall be able to study the protogalactic material surrounding these quasars at a time when the Universe was less than a billion years old. This timescale is equivalent to the dynamical timescale for a typical 100kpc galactic halo (eg Rees 1988) and the observed surface brightness distribution, or limits thereon, will be an important constraint on both quasar formation and galaxy formation scenarios. Our targets are the recently discovered, z=4.30, radio loud quasar, GB1508+5714 and the z=4.69, radio quiet quasar BR1202-0725. The former quasar is the highest redshift radio source known and the host is likely to be the progenitor of a nearby giant Elliptical galaxy. The other quasar is radio quiet and moreover it has been detected in the 300--1200Mu m wavelength range (ie ~100--200Mu m in the rest frame) with JCMT and the IRAM 30m. The inferred FIR luminosity (sim10^14L(sun)) and dust mass estimates are similar to that obtained for the z=2.3 IRAS galaxy 10214+4724. The host of this quasar is highly likely to be a spiral galaxy or some sort of interacting
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