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Far-reaching dust distribution in galaxy discs

Smith, Matthew W. L. and Lu, Nanyao (2016) Far-reaching dust distribution in galaxy discs. Monthly Notices of the Royal Astronomical Society, 462 (1). pp. 331-344. ISSN 0035-8711. doi:10.1093/mnras/stw1611.

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In most studies of dust in galaxies, dust is only detected from its emission to approximately the optical radius of the galaxy. By combining the signal of 110 spiral galaxies observed as part of the Herschel Reference Survey, we are able to improve our sensitivity by an order of magnitude over that for a single object. Here we report the direct detection of dust from its emission that extends out to at least twice the optical radius. We find that the distribution of dust is consistent with an exponential at all radii with a gradient of ∼−1.7 dex R^(−1)_(25). Our dust temperature declines linearly from ∼25 K in the centre to 15 K at R_(25) from where it remains constant out to ∼2.0 R_(25). The surface density of dust declines with radius at a similar rate to the surface density of stars but more slowly than the surface density of the star-formation rate. Studies based on dust extinction and reddening of high-redshift quasars have concluded that there are substantial amounts of dust in intergalactic space. By combining our results with the number counts and angular correlation function from the SDSS, we show that with Milky Way-type dust we can explain the reddening of the quasars by the dust within galactic discs alone. Given the uncertainties in the properties of any intergalactic dust, we cannot rule out its existence, but our results show that statistical investigations of the dust in galactic haloes that use the reddening of high-redshift objects must take account of the dust in galactic discs.

Item Type:Article
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URLURL TypeDescription
http://dx/doi/org/10.1093/mnras/stw1611DOIArticle Paper
Smith, Matthew W. L.0000-0002-3532-6970
Lu, Nanyao0000-0002-8948-1044
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 July 4. Received 2016 July 4. In original form 2015 December 6. First published online July 6, 2016. We thank everyone involved with the Herschel Space Observatory. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including: University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, University of Sussex (UK); and Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). HIPE is a joint development by the Herschel Science Ground Segment Consortium, consisting of ESA, the NASA Herschel Science Center and the HIFI, PACS, and SPIRE consortia. This research made use of Astropy, a community-developed core python package for Astronomy (Astropy Collaboration, 2013). HLG acknowledges support from the European Research Council (ERC) in the form of Consolidator Grant CosmicDust (ERC-2014-CoG-647939).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories of ChinaUNSPECIFIED
Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)UNSPECIFIED
Centre National d'Etudes Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
European Research Council (ERC)ERC-2014-CoG-647939
Subject Keywords:galaxies: ISM galaxies: spiral submillimetre: ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20161017-115729190
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Official Citation:Matthew W. L. Smith, Stephen A. Eales, Ilse De Looze, Maarten Baes, George J. Bendo, Simone Bianchi, Médéric Boquien, Alessandro Boselli, Veronique Buat, Laure Ciesla, Marcel Clemens, David L. Clements, Asantha R. Cooray, Luca Cortese, Jonathan I. Davies, Jacopo Fritz, Haley L. Gomez, Thomas M. Hughes, Oskar Ł. Karczewski, Nanyao Lu, Seb J. Oliver, Aurélie Remy-Ruyer, Luigi Spinoglio, and Sebastien Viaene Far-reaching dust distribution in galaxy discs MNRAS (October 11, 2016) Vol. 462 331-344 doi:10.1093/mnras/stw1611 first published online July 6, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71178
Deposited By: Ruth Sustaita
Deposited On:17 Oct 2016 20:13
Last Modified:11 Nov 2021 04:40

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