Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..572w&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We measure SFRs in DLAs from heating rates indicated by the strength of CII* absorption. The SFR per unit area is comparable to that in the Milky Way ISM. We find the SFR per unit comoving volume agrees with that determined for LBGs. Though the comoving density of produced stars agrees with the current density of stars the density of produced metals is 30 times that observed in DLAs. Star formation may occur in a centrally located bulge which explains the origin of an old metal-rich population and why metal enrichment of the surrounding absorbing gas is so slow. Our measurements indicate the comoving density of DLAs exceeds the current density of galaxies and that the DLAS may come from a population of z=3 galaxies fainter than R=27. We find DLAs to be two-phase media in which CNM gas is in pressure equilibrium with WNM gas. The presence of CNM gas is consistent with the measured CII/CI ratios the pressure predicted by CDM models and the absence of 21 cm absorption at z > 3. We find no evidence for feedback. Heating is likely due to the grain photoelectroc effect indicated by a correlation between heating rates and dust-to-gas ratios.
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