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Detailed modelling of a large sample of Herschel sources in the Lockman Hole: identification of cold dust and of lensing candidates through their anomalous SEDs

Rowan-Robinson, Michael and Wang, Lingyu and Wardlow, Julie and Farrah, Duncan and Oliver, Seb and Bock, Jamie and Clarke, Charlotte and Clements, David and Ibar, Edo and Gonzalez-Solares, Eduardo and Marchetti, Lucia and Scott, Douglas and Smith, Anthony J. and Vaccari, Mattia and Valtchanov, Ivan (2014) Detailed modelling of a large sample of Herschel sources in the Lockman Hole: identification of cold dust and of lensing candidates through their anomalous SEDs. Monthly Notices of the Royal Astronomical Society, 445 (4). pp. 3848-3861. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20141218-082850497

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Abstract

We have studied in detail a sample of 967 SPIRE sources with 5σ detections at 350 and 500 μm and associations with Spitzer-SWIRE 24 μm galaxies in the HerMES-Lockman survey area, fitting their mid- and far-infrared, and submillimetre, spectral energy distributions (SEDs) in an automatic search with a set of six infrared templates. For almost 300 galaxies, we have modelled their SEDs individually to ensure the physicality of the fits. We confirm the need for the new cool and cold cirrus templates, and also of the young starburst template, introduced in earlier work. We also identify 109 lensing candidates via their anomalous SEDs and provide a set of colour–redshift constraints which allow lensing candidates to be identified from combined Herschel and Spitzer data. The picture that emerges of the submillimetre galaxy population is complex, comprising ultraluminous and hyperluminous starbursts, lower luminosity galaxies dominated by interstellar dust emission, lensed galaxies and galaxies with surprisingly cold (10–13 K) dust. 11 per cent of 500 μm selected sources are lensing candidates. 70 per cent of the unlensed sources are ultraluminous infrared galaxies and 26 per cent are hyperluminous. 34 per cent are dominated by optically thin interstellar dust (‘cirrus’) emission, but most of these are due to cooler dust than is characteristic of our Galaxy. At the highest infrared luminosities we see SEDs dominated by M82, Arp 220 and young starburst types, in roughly equal proportions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/stu1959DOIArticle
http://mnras.oxfordjournals.org/content/445/4/3848.fullPublisherArticle
http://arxiv.org/abs/1409.5136arXivDiscussion Paper
http://mnras.oxfordjournals.org/content/445/4/3848/suppl/DC1PublisherSupporting Information
ORCID:
AuthorORCID
Wardlow, Julie0000-0003-2376-8971
Farrah, Duncan0000-0003-1748-2010
Clements, David0000-0002-9548-5033
Valtchanov, Ivan0000-0001-9930-7886
Additional Information:© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 September 18. Received 2014 September 17; in original form 2014 May 6. First published online October 31, 2014. SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); Caltech, JPL, NHSC, Univ. 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 (UK); and NASA (USA). The Dark Cosmology Centre (JW) is funded by the Danish National Research Foundation. The data presented in this paper are available through the Herschel Database in Marseille HeDaM.3 SJO acknowledges support from the Science and Technology Facilities Council (grant numbers ST/L000652/1) and from the European Commission Research Executive Agency REA (Grant Agreement Number 607254). EI acknowledges funding from CONICYT/FONDECYT postdoctoral project no.: 3130504.
Funders:
Funding AgencyGrant Number
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
NASAUNSPECIFIED
Danish National Research FoundationUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/L000652/1
European Commission Research Executive Agency REA607254
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3130504
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Subject Keywords:gravitational lensing: strong, galaxies: evolution, galaxies: starburst, cosmology: observations, infrared: galaxies, submillimetre: galaxies
Record Number:CaltechAUTHORS:20141218-082850497
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141218-082850497
Official Citation:Michael Rowan-Robinson, Lingyu Wang, Julie Wardlow, Duncan Farrah, Seb Oliver, Jamie Bock, Charlotte Clarke, David Clements, Edo Ibar, Eduardo Gonzalez-Solares, Lucia Marchetti, Douglas Scott, Anthony Smith, Mattia Vaccari, and Ivan Valtchanov Detailed modelling of a large sample of Herschel sources in the Lockman Hole: identification of cold dust and of lensing candidates through their anomalous SEDs MNRAS (December 21, 2014) Vol. 445 3848-3861 doi:10.1093/mnras/stu1959 First published online October 31, 2014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53001
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Dec 2014 23:05
Last Modified:21 Oct 2017 00:03

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