10/23/14 SO/NOAO Joint Colloquium Series: Sangeeta Malhotra
Sangeeta Malhotra, ASU
[CII] emission line as tracer of ISM in galaxies near and far.
Are the physical conditions for high redshift star-formation different from local starbursts, or are differences observed because we can study only the most luminous galaxies at high redshifts? We address this question with a relatively unbiased survey of [CII] line emission of highly lensed galaxies at redshift z=1-3 from the Herschel Extreme Lensing Line Observations (HELLO) survey. These galaxies span a range of luminosities and star-formation rates from 7-100 solar-masses/year, but they are lensed enabling HIFI measurements of [CII] line fluxes for these galaxies. We use [CII]/FIR ratios as a diagnostic of the physical conditions in the ISM in these galaxies, and compare them to low redshift normal galaxies. Additionally, the high spectral resolution of HIFI enables us to study the kinematics of ISM in several galaxies. I will also discuss how this relates to studies of nearby galaxies and prospects for doing the most distant high redshift galaxies with ALMA.
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