Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915420t&link_type=abstract
American Astronomical Society, AAS Meeting #219, #154.20
Other
Scientific paper
We present an analysis of the Mpc-scale environments of hyperluminous QSOs (HLQSOs) at z 2.7 using data from the Keck Baryonic Structure Survey (KBSS). Our data include a large sample of spectroscopic galaxy redshifts (Ngal 1500), where each galaxy lies within 3' of one of 15 of the brightest QSOs at these redshifts. We find that the average HLQSO in our sample is associated in redshift with a significant overdensity in the galaxy distribution with a velocity scale of 300 km/s and a transverse scale of 25" ( 200 proper kpc). We estimate the galaxy-HLQSO cross-correlation function and galaxy autocorrelation function on small transverse scales to compare the halo masses of HLQSOs and star-forming galaxies at these redshifts. We find that the HLQSO host halos have masses log(M/Msun)≈12.4, which is consistent with our dynamical estimates and only 3x more massive than the galaxy host halos of mass log(M/Msun)≈11.9. We also present recent results from narrow-band survey matched to Ly-α at the redshifts of the HLQSOs. We have spectroscopically confirmed more than 200 Ly-α candidates, which may exhibit fluorescent emission due to the ionizing field of the HLQSOs. Taken together, these measurements will help answer the question of whether HLQSOs inhabit extremely unique environments or are merely observed at special times in an otherwise normal process of galaxy evolution.
Steidel Charles C.
Trainor Ryan
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