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Resolving the ISM a...
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
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- Rivera, Gabriela Calistro (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Hodge, J. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Smail, I. (author)
- Durham University
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- Swinbank, A.M. (author)
- Durham University
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- Weiß, A. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Wardlow, J. L. (author)
- Durham University
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- Walter, F. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Rybak, M. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Chen, C. C. (author)
- European Southern Observatory (ESO)
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- Brandt, W. N. (author)
- Pennsylvania State University
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- Coppin, K. E. K. (author)
- University of Hertfordshire
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- Cunha, E. Da (author)
- Australian National University
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- Dannerbauer, H. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Greve, T. R. (author)
- University College London (UCL)
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- Karim, A. (author)
- Universität Bonn,University of Bonn
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- Knudsen, Kirsten Kraiberg, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Schinnerer, E. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Simpson, J. M. (author)
- Academia Sinica Taiwan
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- Venemans, B. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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(creator_code:org_t)
- 2018-08-09
- 2018
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 863:1
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Abstract
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- 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 the12CO(J =3-2) emission, are consistent with disk rotation to the first order, implying average dynamical masses of ∼3 1011within 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-H2conversion factor, αCO, finding values of 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).
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- ISM: structure
- submillimeter: galaxies
- galaxies: ISM
- galaxies: structure
- galaxies: kinematics and dynamics
- submillimeter: ISM
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Rivera, Gabriela ...
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Hodge, J.
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Smail, I.
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Swinbank, A.M.
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Weiß, A.
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Wardlow, J. L.
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show more...
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Walter, F.
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Rybak, M.
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Chen, C. C.
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Brandt, W. N.
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Coppin, K. E. K.
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Cunha, E. Da
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Dannerbauer, H.
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Greve, T. R.
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Karim, A.
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Knudsen, Kirsten ...
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Schinnerer, E.
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Simpson, J. M.
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Venemans, B.
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van der Werf, P.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
- Articles in the publication
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Astrophysical Jo ...
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Chalmers University of Technology