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23 April 2024 |
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A Direct Detection of Gas Accretion: The Lyman Limit System in 3C 232 | | John T. Stocke
; Brian A. Keeney
; Charles W. Danforth
; | | Date: |
26 Feb 2010 | | Abstract: | The gas added and removed from galaxies over cosmic time greatly affects
their stellar populations and star formation rates. QSO absorption studies in
close QSO/galaxy pairs create a unique opportunity to study the physical
conditions and kinematics of this gas. Here we present new Hubble Space
Telescope (HST) images of the QSO/galaxy pair 3C 232/NGC 3067. The quasar
spectrum contains a Lyman-limit absorption system (LLS) due to NGC 3067 at cz =
1421 km/s. Previous work identifies this absorber as a high-velocity cloud
(HVC) in NGC 3067 but the kinematics of the absorbing gas, infalling or
outflowing, were uncertain. The HST images presented here establish the
orientation of NGC 3067 and so establish that the LLS/HVC is infalling. Using
this system as a prototype, we extend these results to higher-z Mg II/LLS to
suggest that Mg II/LLSs are a sight line sampling of the so-called "cold mode
accretion" (CMA) infalling onto luminous galaxies. But to match the observed Mg
II absorber statistics, the CMA must be more highly ionized at higher
redshifts. The key observations needed to further the study of low-z LLSs is
HST/UV spectroscopy, for which a new instrument, the Cosmic Origins
Spectrograph, has just been installed greatly enhancing our observational
capabilities. | | Source: | arXiv, 1002.5033 | | Services: | Forum | Review | PDF | Favorites | |
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