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  Resolving the ISM at the Peak of Cosmic Star Formation with ALMA: The Distribution of CO and Dust Continuum in z ̃ 2.5 Submillimeter Galaxies

Calistro Rivera, G., Hodge, J. A., Smail, I., Swinbank, A. M., Weiss, A., Wardlow, J. L., et al. (2018). Resolving the ISM at the Peak of Cosmic Star Formation with ALMA: The Distribution of CO and Dust Continuum in z ̃ 2.5 Submillimeter Galaxies. The Astrophysical Journal, 863.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CE94-C Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CE95-B
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...863...56C (Any fulltext)
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 Creators:
Calistro Rivera, Gabriela1, Author
Hodge, J. A.1, Author
Smail, Ian1, Author
Swinbank, A. M.1, Author
Weiss, A.1, Author
Wardlow, J. L.1, Author
Walter, F.1, Author
Rybak, M.1, Author
Chen, Chian-Chou1, Author
Brandt, W. N.1, Author
Coppin, K.1, Author
da Cunha, E.1, Author
Dannerbauer, H.1, Author
Greve, T. R.1, Author
Karim, A.1, Author
Knudsen, K. K.1, Author
Schinnerer, E.1, Author
Simpson, J. M.1, Author
Venemans, B.1, Author
van der Werf, P. P.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: ISM galaxies: kinematics and dynamics galaxies: structure ISM: structure submillimeter: galaxies submillimeter: ISM Astrophysics - Astrophysics of Galaxies
 Abstract: We use Atacama Large Millimeter Array (ALMA) observations of four submillimeter galaxies (SMGs) at z ̃ 2-3 to investigate the spatially resolved properties of the interstellar medium (ISM) at scales of 1-5 kpc (0.″1-0.″6). The velocity fields of our sources, traced by the 12CO(J = 3-2) emission, are consistent with disk rotation to the first order, implying average dynamical masses of ̃3 × 1011 {M}☉ within two half-light radii. Through a Bayesian approach we investigate the uncertainties inherent to dynamically constraining total gas masses. We explore the covariance between the stellar mass-to-light ratio and CO-to-H2 conversion factor, α CO, finding values of {α }CO}={1.1}-0.7+0.8 for dark matter fractions of 15%. We show that the resolved spatial distribution of the gas and dust continuum can be uncorrelated to the stellar emission, challenging energy balance assumptions in global SED fitting. Through a stacking analysis of the resolved radial profiles of the CO(3-2), stellar, and dust continuum emission in SMG samples, we find that the cool molecular gas emission in these sources (radii ̃5-14 kpc) is clearly more extended than the rest-frame ̃250 μm dust continuum by a factor >2. We propose that assuming a constant dust-to-gas ratio, this apparent difference in sizes can be explained by temperature and optical depth gradients alone. Our results suggest that caution must be exercised when extrapolating morphological properties of dust continuum observations to conclusions about the molecular gas phase of the interstellar medium (ISM).

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 Dates: 2018
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 863 Sequence Number: - Start / End Page: - Identifier: -