Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7271b&link_type=abstract
HST Proposal ID #7271
Physics
Hst Proposal Id #7271 Quasar Absorption Lines
Scientific paper
We wish to search for the Lyman and Werner absorption lines of molecular hydrogen {rest LambdaLambda = 1104 to 911 Angstrom} associated with the well-studied damped LyAlpha and 21-cm absorber at z=1.776 in Q1331+170. The rare detection of C I absorption in this system, along with features in the IUE spectrum consistent with the expected H_2 spectrum, make this the most promising redshift system for such a search. After detecting H_2, we plan to measure the relative population in the individual rotation states. The J = 0, 1, 2, 3 states will yield the kinetic temperature of the gas, while the weak J = 4 and higher states will measure {or limit} the local UV radiation field and hydrogen density. The recent detection of C I^* has been used to measure the cosmic microwave background temperature at z=1.776, and test the validity of the Big Bang model. The observed population of the fine structure levels of C I can be explained entirely by the expected CMB radiation, with surprisingly strong limits on local sources of excitation. The H_2 spectrum will enable us to check this result, by allowing us to make an independent estimate of the rate of UV and collisional pumping of the C I^* levels.
No associations
LandOfFree
Molecular Hydrogen in the Damped LyAlpha Absorber of Q1331+170 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Molecular Hydrogen in the Damped LyAlpha Absorber of Q1331+170, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Hydrogen in the Damped LyAlpha Absorber of Q1331+170 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-895331