Absorption Systems in High Redshift QSOs

Molecules in Qsos and Qso Absorption Line Systems at High Redshift

Molecules dominate the cooling function of neutral metal-poor gas at high density. Observation of molecules at high redshift is thus an important tool toward understanding the physical conditions prevailing in collapsing gas. Up to now, detections are sparse because of small filling factor and/or sensitivity limitations. However, we are at an exciting time where new capabilities offer the prope...

Molecular Gas in High Redshift Qsos

We review cm and mm observations of thermal molecular line emission from high redshift QSOs. These observations reveal the massive gas reservoirs (1010 to 1011 M⊙) required to fuel star formation at high rates. We discuss evidence for active star formation in QSO host galaxies, and we show that these high redshift, FIR-luminous QSOs follow the non-linear trend of increasing LF IR/L (CO) with in...

Dust Emission from High-Redshift QSOs.

We present detections of emission at 250 GHz (1.2 mm) from two high-redshift QSOs from the Sloan Digital Sky Survey sample using the bolometer array at the IRAM 30 m telescope. The sources are SDSSp 015048.83+004126.2 at z=3.7 and SDSSp J033829.31+002156.3 at z=5.0; the latter is the third highest redshift QSO known and the highest redshift millimeter-emitting source yet identified. We also pre...

2 Black Hole Demographics : High Redshift QSOs

The Environments of High Redshift QSOs

We present a sample of i-dropout candidates identified in five Hubble Advanced Camera for Surveys fields centered on Sloan Digital Sky Surveys QSOs at redshift z ∼ 6. Our fields are as deep as the Great Observatory Origins Deep Survey (GOODS) ACS images which are used as a reference field sample. The galaxies are color-selected. We find them to be overdense in two fields, underdense in two fiel...