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Seminar Title |
Dense molecular gas in local ULIRGs |
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Speaker: |
Dr.Thomas Greve |
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Affiliation: |
(UCL) |
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| When |
Friday afternoon , Sep. 18, 3:00 p.m |
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Where: |
Room 619 , Office Block, 2 West Beijing Road (PMO, CAS) |
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Welcome to Attend |
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( PMO Academic Committee & Academic Circulating committee) |
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Abstract
The population of nearby of gas-rich and highly dust-obscured Ultra Luminous Infrared Galaxies (ULIRGs) provides us with a unique opportunity to study the physical processes governing star formation in kinematically violent and radiation-harsh environments.
As part of the Herschel Comprehensive (U)LIRG Emission Survey (HerCULES) we have obtained the full CO rotational ladder for a sample of 26 (U)LIRGs. In addition, we have compiled our ground-based spectral line observations of this sample, as well as all available data from the literature, of crucial dense gas tracers such as CS, HCN, and HCO+ (and in some cases their isotopologues).
I will discuss some of the first results coming out of this unique data-set, from simple star formation relations to multi-phased Large Velocity Gradient (LVG) radiative transfer models that allow us to disentangle different molecular gas phases and possibly different molecular gas heating mechanisms in these galaxies.
