NGC 628: Could it BE a Prototype QSO Absorption-Line System - Cycle 3 Supplemental

Details NGC 628: Could it BE a Prototype QSO Absorption-Line System - Cycle 3 Supplemental NGC 628: Could it BE a Prototype QSO Absorption-Line System - Cycle 3 Supplemental

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4512b&link_type=abstract

HST Proposal ID #4512

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Hst Proposal Id #4512

Scientific paper

The ScI galaxy NGC 628 is embedded in a giant, warped disk of neutral gas whose size nearly matches the cross-section inferred for the intervening absorbers identified in the spectra of high redshift QSOs. The galaxy may resemble the narrow, low-ionization systems identified by the MgII doublet 2796,2802 and the other common ISM lines of FeII, SiII, CII, OI, etc. Fortuitously, a background QSO lies behind the the most extended part of the gas distribution, and the QSO continuum can be used to probe the gas for the presence of metals by searching for the MgII doublet in absorption at the known redshift of this fore-ground galaxy. The observation will place strict constraints on the history of stellar populations and metal enrichment of these galactic outskirts that are not detectable in optical emission but comprise one tenth of the galaxy's neutral gas content.

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