Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8596p&link_type=abstract
HST Proposal ID #8596
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #8596 Quasar Absorption Lines And Igm
Scientific paper
Galactic-scale outflows are now known to be a common occurrence in star-forming galaxies, in the nearby universe and at high redshift. These superwinds have fundamental astrophysical implications for regulating star formation, determining the evolution of the host galaxies, disseminating the products of stellar nucleosynthesis over large volumes, and are probably responsible for many of the metal absorption lines seen in QSO spectra. In order to understand the physical process involved, we have been developing detailed chemo- spectro-dynamical models which, however, suffer from a lack of direct observational constraints. We propose to remedy this situation by detecting the hot gas from NGC3067, a galaxy with concentrated nuclear star formation giving rise to an outflow seen in X-rays, in STIS G140M spectra of the background QSO 3C232. Although this is one of the best studied QSO-galaxy pairs, there have been no high-resolution observations yet targeted at absorption lines of highly ionized species, as requested here. In addition, STIS spectroscopy of the nuclear regions of the galaxy will establish the age and properties of the stellar population, so far only known from imaging data. By bringing together X-ray, UV and optical data we will obtain the first quantitative description of a galactic outflow, its relation to the star-formation activity in the galaxy, and its effects on the interstellar and intergalactic medium.
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