Computer Science
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11640w&link_type=abstract
HST Proposal ID #11640. Cycle 17
Computer Science
Scientific paper
We propose to image the Lyman Alpha emission line in two of the highest redshift quasar host galaxies {redshifts z=6.31 and 6.42} to map the amount and extent of star formation in the hosts and in their immediate environment. These observations are now possible for the first time, as UVIS on WFC3 {coincidentally} provides narrow-band filters at the right wavelengths. Circumstantial evidence {based on NIR, radio/millimeter and molecular gas measurements} suggests that these quasar hosts are undergoing intense 1000 Msun/yr bursts of star formation over scales of 5kpc {0.6"}. Our program will provide {continuum-subtracted} images of the Lyman Alpha emission in the host which will in turn directly constrain the extent and magnitude of star formation in the host. In the case of the host galaxy of J1148+5251 {z=6.42} the Lyman Alpha emission will be compared to resolved imaging of the molecular gas phase {CO and [CII]} which in turn will yield critical constraints on the structure of the host galaxy and the conditions of the interstellar medium. The observations should also be sensitive enough to reveal potential companion galaxies {if the quasars are residing in major overdensities at these redshifts} and infall signatures in the immediate vicinity of the quasar. The narrow-band filters of UVIS/WFC3 provide the unique opportunity to study host/bulge formation at the end of cosmic reionization {less than 1Gyr after the Big Bang}.;
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