Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9874t&link_type=abstract
HST Proposal ID #9874
Computer Science
Hst Proposal Id #9874 Quasar Absorption Lines And Igm
Scientific paper
We propose STIS G140L SNAPSHOT observations of 100 new z < 1 QSOs from the Sloan Digital Sky Survey for studies of the IGM. These targets will be chosen to simultaneously maximize IGM pathlength and to form closely spaced groups of 2-8 QSO sightlines within 1 h^-1 Mpc of a foreground galaxy. These observations will, in the long term, provide a rich database of target QSOs for detailed study by COS of the IGM phases, metallicity, and relationship to the large scale structure. In the near term, these observations will detect up to 10 Lyman alpha clouds with N_HI > 10^14 and 3 clouds with N_HI > 10^15, per target. Thus they will provide an immediate test of filamentary structure in the "cosmic web" within 1 h^-1 Mpc of galaxies. We ask for 22 minute exposures for each target with STIS/G140L to obtain S/N = 5-16 for these V = 16 - 18 QSOs. These observations will be sensitive to Lyman alpha equivalent widths ranging from 300 mA for the brighter sources to 600 mA at the fainter end. These targets represent a Deltaz pathlength of 17 {at 50% yield}, with Deltaz = 10 in the range where Lya, Lyb, and O VI lie in the HST band. These observations will also refine predictions of the FUV flux of QSOs based on the larger SDSS sample and will estimate the degree to which such factors as intrinsic and Galactic extinction, variability, and intervening absorption can be controlled. If successful, this technique could make UV-prequalification SNAPs of QSOs obsolete, at a significant savings of HST time. Our observations lie at the median duration for SNAPs, and in the range most likely to be executed. Our program accomplishes both near- and long-term goals at a relatively low investment of time, and thus is ideally suited for a SNAP proposal. To ensure maximum scientific return for our own purposes and for additional science {HVCs, Galactic halo} we waive the right to a proprietary data period.
No associations
LandOfFree
Probing IGM Phases, Metals, and the Cosmic Web with New SDSS QSOs 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 Probing IGM Phases, Metals, and the Cosmic Web with New SDSS QSOs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing IGM Phases, Metals, and the Cosmic Web with New SDSS QSOs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1133630