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Mary Putman (Columbia University)7/30/19, 9:00 AM
A galaxy needs to constantly replenish its HI reservoir in order to continue to form stars over cosmic time. The majority of the baryons in the Universe are in an ionized gas phase outside of a galaxy and therefore must somehow cool and settle on to the galaxy's star forming region. I will discuss the observational evidence for the flow of gas between these two phases.
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Snezana Stanimirovic (University of Wisconsin)7/30/19, 9:30 AM
Cold interstellar clouds are a necessary step on the way to star formation. Yet, understanding how these clouds form out of the warm diffuse medium, and what fundamental processes regulate their atomic and molecular fractions, has been largely unexplored. We have recently completed the first statistical study of the properties of neutral gas over the entire temperature range $10-10^4\,{\rm...
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Freeke van de Voort (MPA)7/30/19, 9:50 AM
Galaxies are intimately connected to the environments they live in: they grow by accreting gas from the circumgalactic medium (CGM) and they heat and enrich the CGM through galactic outflows. Most cosmological, hydrodynamical simulations focus their computational effort on the galaxies themselves and treat the CGM more coarsely, which means small-scale structure cannot be resolved. I will...
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Katharina Lutz (CDS, CNRS, Observatoire astronomique de Strasbourg)7/30/19, 10:10 AM
We present the latest results from the HIX galaxy survey, which studies a sample of the most HI-rich (for their optical luminosity) and HI-massive spiral galaxies in the local universe. Given their large and massive HI discs, their high redshift counterparts might be among the first galaxies, we will detect in HI beyond the currently observable redshift range. A detailed examination of the...
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Erwin de Blok (ASTRON)7/30/19, 11:00 AM
I give an overview of recent observational results constraining the local HI accretion rate. These are mostly based on data from the WSRT HALOGAS survey, which recently had its public data release. Using the limits derived from HALOGAS data I discuss the parameter space that future HI surveys on SKA precursors and SKA itself must cover in order to further constrain the local cold gas accretion rate.
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Michael Rauch (Carnegie Observatories)7/30/19, 11:20 AM
In principle, QSO absorption lines studies can provide the most sensitive approach to studying galactic in-and outflows of gas. In reality, it has remained difficult to distinguish between the two, and theoretical prejudices have often driven the interpretation of absorption line results.
I shall present recent observations of the intergalactic medium (IGM) and galaxies, partly combining...
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Hsiao-Wen Chen (The University of Chicago)7/30/19, 11:40 AM
Damped Lya absorbers (DLAs) probe the neutral gas in the interstellar medium, extended rotating disks, and likely dense gaseous streams in galaxy halos. The large gas surface mass densities revealed in DLAs are comparable to what is seen in 21 cm observations of nearby star-forming galaxies, making DLAs a promising signpost of distant young galaxies. In this talk, I will present new damped...
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Tayyaba Zafar (AAO)7/30/19, 12:00 PM
Damped Lyman $\alpha$ absorbers (DLAs) seen along the lines of sight of luminous quasars are a unique probe to select neutral hydrogen rich galaxies. These galaxies allow to estimate neutral gas mass over cosmological scales, which is a possible indicator of gas consumption as the star formation proceeds. The DLAs and sub-DLAs are believed to contain a large fraction of neutral gas mass in the...
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