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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
journal contribution
posted on 2023-06-08, 20:46 authored by Michael Rowan-Robinson, Lingyu Wang, Julie Wardlow, Duncan Farrah, Seb OliverSeb Oliver, Jamie Bock, Charlotte Clarke, David Clements, Edo Ibar, Eduardo Gonzales-Solares, Lucia Marchetti, Douglas Scott, Anthony Smith, Mattia Vaccari, Ivan ValtchanovWe have studied in detail a sample of 967 SPIRE sources with 5s detections at 350 and 500 µm and associations with Spitzer-SWIRE 24 µm galaxies in the HerMES-Lockman survey area, fitting theirmid- 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 havemodelled 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.
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Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
4Volume
445Page range
3848-3861Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2015-05-15First Open Access (FOA) Date
2015-05-15First Compliant Deposit (FCD) Date
2015-05-14Usage metrics
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