Primary Recipient

TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA

Amount

$210,856.00

Award Date

6/05/2009

Administering Agency

National Science Foundation

CDFA Number

47.082

CDFA Program Title

Trans-NSF Recovery Act Reasearch Support

Description

In 2003, the PI showed that the effective optical depth in the Ly alpha forest region of 1061 low resolution QSO spectra drawn from the SDSS database decreases with decreasing redshift over the range 2.5 z 4. Although the evolution is relatively smooth,