Extreme Galaxies During Reionization: Testing ISM and Disk Models

Abstract

We test the ability of equilibrium galactic disk and one-zone interstellar medium models to describe the physical and emission properties of quasar hosts, submillimeter galaxies, and Lyman-alpha emitters at z>~6. The size, line widths, star formation rates, black hole accretion rates, gas masses and temperatures, and the relationships between these properties are all well-described by our model, and we provide approximate fitting formulae for comparison with future observations. However, comparing our carbon line predictions to observations reveals differences between the ISM at low and high redshifts. Our underestimate of the [CII] line emission indicates either higher star formation efficiencies in high-redshift molecular clouds or less depletion of metals into dust at fixed metallicity. Further, our over-prediction of the CO(6-5)/CO(1-0) ratio suggests that molecular clouds in real high-redshift galaxies have a lower turbulent Mach number and more subthermal CO(6-5) emission than expected owing either to sizes smaller than the local Jeans mass or to a pressure support mechanism other than turbulence.

Accepted in MNRAS; 19 pages; 10 figures; 4 tables

References in corpus (15)

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Cited by in corpus (10)

• The [CII] 158 micron line emission in high-redshift galaxies
• On the [CII]-SFR relation in high redshift galaxies
• An analytic solution for the minimal bathtub toy model: challenges in the star-formation history of high-z galaxies
• Zooming on the internal structure of $z\simeq 6$ galaxies
• Interpreting ALMA Observations of the ISM During the Epoch of Reionisation
• SIGAME simulations of the [CII], [OI] and [OIII] line emission from star forming galaxies at z ~ 6
• A Minimalist Feedback-Regulated Model for Galaxy Formation During the Epoch of Reionization
• First Results from COPSS: The CO Power Spectrum Survey
• The [CII] Deficit in LIRGs and ULIRGs is Due to High-Temperature Saturation
• Mapping metals at high redshift with far-infrared lines