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Star Formation in Quasar Host Galaxies at Redshift 6: Millimeter Surveys and New Insights from ALMA
Ran Wang, Jeff Wagg, Chris L. Carilli +9
We have been carrying out a systematic survey of the star formation and ISM properties in the host galaxies of z~6 quasars. Our 250 GHz observations, together with available data f…
Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution, and implications for the IMF
Christopher C. Hayward, Desika Narayanan, Dušan Kereš +4
High-redshift submillimetre galaxies (SMGs) are some of the most rapidly star-forming galaxies in the Universe. Historically, galaxy formation models have had difficulty explaining…
The Cosmic Evolution of the IMF Under the Jeans Conjecture with Implications for Bottom-Heavy Ellipticals
Desika Narayanan, Romeel Davé
We examine the cosmic evolution of a stellar initial mass function (IMF) in galaxies that varies with the Jeans mass in the interstellar medium, paying particular attention to the…
Why is the Milky Way X-factor Constant?
Desika Narayanan, Philip Hopkins
The CO-H2 conversion factor (Xco; otherwise known as the X-factor) is observed to be remarkably constant in the Milky Way and in the Local Group (aside from the SMC). To date, our…
Galaxy Gas Fractions at High-Redshift: The Tension between Observations and Cosmological Simulations
Desika Narayanan, Matt Bothwell, Romeel Dave
CO measurements of z~1-4 galaxies have found that their baryonic gas fractions are significantly higher than galaxies at z=0, with values ranging from 20-80 %. Here, we suggest tha…
Dense Molecular Gas: A Sensitive Probe of Stellar Feedback Models
Philip F. Hopkins, Desika Narayanan, Norman Murray +1
We show that the mass fraction of GMC gas (n>100 cm^-3) in dense (n>>10^4 cm^-3) star-forming clumps, observable in dense molecular tracers (L_HCN/L_CO(1-0)), is a sensitive probe…