Resolving the ISM at the Peak of Cosmic Star Formation with ALMA: The Distribution of CO and Dust Continuum in z similar to 2.5 Submillimeter Galaxies
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Calistro Rivera, Gabriela; Hodge, Jacqueline; Smail, Ian; Swinbank, A M; Weiss, A; Wardlow, J L; Walter, Fabian; Rybak, M; Chen, Chian-Chou; Brandt, W N; da Cunha, Elisabete
Description
We use Atacama Large Millimeter Array (ALMA) observations of four submillimeter galaxies (SMGs) at z similar to 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 (CO)-C-12(J = 3-2) emission, are consistent with disk rotation to the first order, implying average dynamical masses of similar to 3 x 10(11) M-circle dot. within two half-light radii. Through a Bayesian approach...[Show more]
dc.contributor.author | Calistro Rivera, Gabriela | |
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dc.contributor.author | Hodge, Jacqueline | |
dc.contributor.author | Smail, Ian | |
dc.contributor.author | Swinbank, A M | |
dc.contributor.author | Weiss, A | |
dc.contributor.author | Wardlow, J L | |
dc.contributor.author | Walter, Fabian | |
dc.contributor.author | Rybak, M | |
dc.contributor.author | Chen, Chian-Chou | |
dc.contributor.author | Brandt, W N | |
dc.contributor.author | da Cunha, Elisabete | |
dc.date.accessioned | 2020-09-20T23:52:21Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/210656 | |
dc.description.abstract | We use Atacama Large Millimeter Array (ALMA) observations of four submillimeter galaxies (SMGs) at z similar to 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 (CO)-C-12(J = 3-2) emission, are consistent with disk rotation to the first order, implying average dynamical masses of similar to 3 x 10(11) M-circle dot. 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-H-2 conversion factor, alpha(CO), finding values of alpha(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 similar to 5-14 kpc) is clearly more extended than the rest-frame similar to 250 mu m 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). | |
dc.description.sponsorship | G.C.R. acknowledges support from the European Research Council under the European Unions Seventh Framework Programme (FP/2007-2013)/ERC Advanced Grant NEW-CLUSTERS321271. J.H. acknowledges support of the VIDI research programme with project number 639.042.611, which is (partly) financed by the Netherlands Organization for Scientific Research (NWO). I.R.S. acknowledges support from the ERC Advanced Grant DUSTYGAL (321334), a Royal Society/ Wolfson Merit Award and STFC (ST/P000541/1). J.L.W. acknowledges support of an STFC Ernest Rutherford Fellowship (ST/P004784/1) and additional support from STFC (ST/ P000541/1). F.W. and B.P.V. acknowledge funding through ERC grants “Cosmic Dawn” and “Cosmic Gas.” H.D. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under the 2014 Ramón y Cajal program MINECO RYC-2014-15686. This paper makes use of the following ALMA data: ADS/JAO. ALMA#2013.1.00470.S and #2016.1.00754.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. This research made use of ASTROPY, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013), and the open-source plotting packages for Python APLPY (Robitaille & Bressert 2012), and CORNER (ForemanMackey 2016). | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | IOP Publishing | |
dc.rights | © 2018. The American Astronomical Society | |
dc.source | The Astrophysical Journal | |
dc.title | Resolving the ISM at the Peak of Cosmic Star Formation with ALMA: The Distribution of CO and Dust Continuum in z similar to 2.5 Submillimeter Galaxies | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 863 | |
dc.date.issued | 2018 | |
local.identifier.absfor | 020103 - Cosmology and Extragalactic Astronomy | |
local.identifier.ariespublication | u4485658xPUB1733 | |
local.publisher.url | http://iopscience.iop.org/0004-637X | |
local.type.status | Published Version | |
local.contributor.affiliation | Calistro Rivera, Gabriela, Leiden University | |
local.contributor.affiliation | Hodge, Jacqueline, Leiden University | |
local.contributor.affiliation | Smail, Ian, Durham University | |
local.contributor.affiliation | Swinbank, A M, Durham University | |
local.contributor.affiliation | Weiss, A, Max-Planck Institut für Radioastronomie | |
local.contributor.affiliation | Wardlow, J L, Durham University | |
local.contributor.affiliation | Walter, Fabian, Max Planck Institute for Astronomy | |
local.contributor.affiliation | Rybak, M, Leiden University | |
local.contributor.affiliation | Chen, Chian-Chou, European Southern Observatory | |
local.contributor.affiliation | Brandt, W N, Pennsylvania State University | |
local.contributor.affiliation | da Cunha, Elisabete, College of Science, ANU | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 56 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 16 | |
local.identifier.doi | 10.3847/1538-4357/aacffa | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2020-06-23T00:55:54Z | |
local.identifier.scopusID | 2-s2.0-85051460801 | |
local.identifier.thomsonID | 000441290000012 | |
Collections | ANU Research Publications |
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