Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8571s&link_type=abstract
HST Proposal ID #8571
Mathematics
Logic
Hst Proposal Id #8571 Quasar Absorption Lines And Igm
Scientific paper
Our Cycle 7 STIS/G140M observations along the sightline toward PG 1211+143 reveal numerous LyAlpha absorption lines including 2 very strong LyAlpha absorbers {cz = 15, 300 and 19, 550 km s^- 1} with associated Si III absorption. These are the first definite detections of metals in a low-z LyAlpha forest cloud; simple photoionization models suggest metallicities in the range 1-10 sim10^17 cm^-2 in each system, we should be able to detect deuterium LyAlpha at 10-20 mAngstrom equivalent width, thereby testing models of D/H astration as a function of IGM metallicity, an issue of cosmological significance. We propose to obtain a 25-orbit {S/N 25} STIS/E140M spectrum {1150-1740 Angstrom} at 10 km s^-1 resolution to detect or limit D I {LyAlpha} and to measure metal absorption lines {C IV, Si IV, N V, C II, Si II} observable down to below 10^-2 solar abundance {4 mAngstrom EW limit}. This sightline is one of two prime FUSE targets for long-duration exposures in the extragalactic D/H program. FUSE will detect higher Ly-series lines and the Lyman break {accurate H I column density} and measure key metal lines {C III Lambda977, O VI Lambda1032, 1038}. Thus, the FUSE and STIS programs are highly interdependent.
No associations
LandOfFree
Metallicity and D/H abundance in Low-z LyAlpha Absorbers towards PG 1211+143 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 Metallicity and D/H abundance in Low-z LyAlpha Absorbers towards PG 1211+143, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metallicity and D/H abundance in Low-z LyAlpha Absorbers towards PG 1211+143 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1720221