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Sreevani Jarugula Defense - "Molecules in the Early Universe"
Event Type
Other
Sponsor
Department of Astronomy
Location
Kaler Classroon, Astronomy Building
Virtual
Date
Jul 8, 2022 12:00 pm
Speaker
Sreevani Jarugula
Contact
Rebecca Bare
E-Mail
rsbare@illinois.edu
Phone
217-265-8226
Views
19
Originating Calendar
Astronomy Department Events Calendar
Dusty star-forming galaxies (DSFGs) at high redshift play an important role in the stellar assembly of the early universe. These intensely star-forming galaxies with star formation rates (SFR) ranging from tens to thousands of solar masses per year are enshrouded in dust and bright in the far-infrared and sub-millimeter wavelengths. The physics of the interstellar medium can be studied through molecular observations. Molecular hydrogen (H
2
) is the fuel for star formation and can be traced by carbon monoxide (CO). Water (H
2
O), which is one of the most abundant molecules in the universe, is a good tracer of the infrared radiation. In my thesis talk, I will present a detailed analysis of molecular observations in the high redshift sub-millimeter galaxies (SMGs) discovered in the South Pole Telescope (SPT) survey. From the resolved H
2
O observations with ALMA, we find that the lower energy transitions of H
2
O are correlated with far-infrared luminosity on both global and kiloparsec scales within both starburst galaxies and an active galactic nuclei. This result suggests that H
2
O can be used as a resolved SFR indicator. I will also present a detailed molecular characterization of SPT0311-58 at z=6.9, which is just ~800 Myr after the Big Bang. It is the most massive infrared luminous galaxy pair discovered in the Epoch of Reionization (EoR) and the earliest detections of H
2
O in a starburst galaxy. I will present the results from the radiative transfer modeling of CO transitions, [CI], and dust in this early pair of galaxies. From our analysis, we find that SPT0311-58, in the EoR, is similar to other high-redshift SMGs.
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