Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5422k&link_type=abstract
HST Proposal ID #5422
Computer Science
Hst Proposal Id #5422 Galaxies &Amp, Clusters Gas &Amp, Dust
Scientific paper
Using GHRS we have recently obtained the striking evidence that the neutral HI gas in the very metal-poor dwarf galaxy IZw 18 contains oxygen but with very low abundance (roughly 10(-3) times the solar value). Moreover this result shows that the HI is more metal deficient than the nebular gas by a factor of a least 20. If this oxygen had been formed by past star formation episodes, only one of such bursts would be required to form all the metals which would have been subsequently dispersed in the HI gas. Alternatively there is the possibility that metals observed in the HI gas were produced in a pre-galactic era via a population III generation. We propose to test this idea by observing a set of 3 blue compact galaxies with different metallicities (obtained from the HII regions) using the GHRS and the LSA around the Lyman-ALPHA and the OI lambda 1302 regions. We wish to investigate whether the metallicity of the neutral gas is correlated with that of the HII regions, hence giving constraints on the star formation history in these galaxies. The absence of correlation would favor the population III hypothesis. We also expect to catch Galactic high velocity clouds along the line of sight of one of our targets and thus constrain their origin from the derivation of their metal abundances.
No associations
LandOfFree
Neutral Gas in Blue Compact Galaxies: Population III or Recent Pollution? 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 Neutral Gas in Blue Compact Galaxies: Population III or Recent Pollution?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutral Gas in Blue Compact Galaxies: Population III or Recent Pollution? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1255763