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Predictions for the spatial distribution of the dust continuum emission in 1 < z < 5 star-forming galaxies

Cochrane, R. K. and Hayward, C. C. and Anglés-Alcázar, D. and Lotz, J. and Parsotan, T. and Ma, X. and Kereš, D. and Feldmann, R. and Faucher-Giguère, C. A. and Hopkins, P. F. (2019) Predictions for the spatial distribution of the dust continuum emission in 1 < z < 5 star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 488 (2). pp. 1779-1789. ISSN 0035-8711. doi:10.1093/mnras/stz1736.

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We present the first detailed study of the spatially resolved dust continuum emission of simulated galaxies at 1 < z < 5. We run the radiative transfer code SKIRT on a sample of submillimetre-bright galaxies drawn from the Feedback In Realistic Environments (FIRE) project. These simulated galaxies reach Milky Way masses by z = 2. Our modelling provides predictions for the full rest-frame far-ultraviolet-to-far-infrared spectral energy distributions of these simulated galaxies, as well as 25-pc resolution maps of their emission across the wavelength spectrum. The derived morphologies are notably different in different wavebands, with the same galaxy often appearing clumpy and extended in the far-ultraviolet yet an ordered spiral at far-infrared wavelengths. The observed-frame 870-μm half-light radii of our FIRE-2 galaxies are ∼0.5−4kpc⁠, consistent with existing ALMA observations of galaxies with similarly high redshifts and stellar masses. In both simulated and observed galaxies, the dust continuum emission is generally more compact than the cold gas and the dust mass, but more extended than the stellar component. The most extreme cases of compact dust emission seem to be driven by particularly compact recent star formation, which generates steep dust temperature gradients. Our results confirm that the spatial extent of the dust continuum emission is sensitive to both the dust mass and star formation rate distributions.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Cochrane, R. K.0000-0001-8855-6107
Hayward, C. C.0000-0003-4073-3236
Anglés-Alcázar, D.0000-0001-5769-4945
Lotz, J.0000-0003-3130-5643
Ma, X.0000-0001-8091-2349
Kereš, D.0000-0002-1666-7067
Feldmann, R.0000-0002-1109-1919
Faucher-Giguère, C. A.0000-0002-4900-6628
Hopkins, P. F.0000-0003-3729-1684
Additional Information:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 May 8. Received 2019 May 3; in original form 2019 March 18. Published: 25 June 2019. This work was initiated as a project for the Kavli Summer Programme in Astrophysics held at the Center for Computational Astrophysics of the Flatiron Institute in 2018. The programme was co-funded by the Kavli Foundation and the Simons Foundation. We thank them for their generous support. RKC acknowledges funding from the Science and Technology Facilities Council (STFC) via a studentship and thanks Philip Best for helpful discussions and comments. DAA acknowledges support from a Flatiron Fellowship. The Flatiron Institute is supported by the Simons Foundation. DK was supported by NSF grant AST-1715101 and the Cottrell Scholar Award from the Research Corporation for Science Advancement. RF acknowledges financial support from the Swiss National Science Foundation (grant number 157591). CAFG was supported by NSF through grants AST-1517491, AST-1715216, and CAREER award AST-1652522; by NASA through grant 17-ATP17-0067; by CXO through grant TM7-18007; by STScI through grant HST-AR-14562.001; and by a Cottrell Scholar Award from the Research Corporation for Science Advancement. The simulations were run using XSEDE, supported by NSF grant ACI-1053575, and Northwestern University’s compute cluster ‘Quest’.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Kavli FoundationUNSPECIFIED
Simons FoundationUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Flatiron InstituteUNSPECIFIED
Cottrell Scholar of Research CorporationUNSPECIFIED
Swiss National Science Foundation (SNSF)157591
NASA Hubble FellowshipHST-AR-14562.001
Northwestern UniversityUNSPECIFIED
Subject Keywords:radiative transfer – galaxies: evolution – galaxies: star formation – galaxies: starburst – infrared: galaxies – submillimetre: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20190912-080110123
Persistent URL:
Official Citation:R K Cochrane, C C Hayward, D Anglés-Alcázar, J Lotz, T Parsotan, X Ma, D Kereš, R Feldmann, C A Faucher-Giguère, P F Hopkins, Predictions for the spatial distribution of the dust continuum emission in 1 < z < 5 star-forming galaxies, Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 2, September 2019, Pages 1779–1789,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98597
Deposited By: Tony Diaz
Deposited On:12 Sep 2019 17:20
Last Modified:16 Nov 2021 17:40

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