Speaker
Description
I will present high-resolution millimeter images of dust and gas in high-redshift dusty star-forming galaxies (DSFGs). SPT0418-47 ($z \approx$ 4.22) and SPT2147-50 ($z \approx 3.76$) are two of the most well-studied gravitationally lensed, high-redshift DSFGs selected by the South Pole Telescope. Using Atacama Large Millimeter/submillimeter Array (ALMA) observations of these galaxies, I create maps of dust continuum (160 and 380 $\mu$m), [CII], CO(7-6), [CI] (2-1), and, in SPT0418-47, water emission. Taking advantage of the galaxies' lensed nature, via state-of-the-art lens modeling tools, I am able to spatially resolve the extent of both dust and gas emission on sub-kiloparsec physical scales, revealing extended [CII] halos in both sources. In the image plane, I apply a wide range of prescribed conversion factors and log-linear relations to the measured line luminosities in both sources, deriving and comparing estimates of star-formation rates (SFR) from [CII], water, and CO emission, and of molecular gas masses from [CII], [CI], and CO emission; I use these estimates to study the Kennicutt-Schmidt relation and gas depletion times in both sources. My work reveals the power of multi-band observations in the millimeter window to deeply probe the ISM properties of gravitationally lensed, high-redshift galaxies, and will be expanded to a wider range of DSFGs in the coming years.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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