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HERUS: The Far-IR/Submm Spectral Energy Distributions of Local ULIRGs & Photometric Atlas

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Title: HERUS: The Far-IR/Submm Spectral Energy Distributions of Local ULIRGs & Photometric Atlas
Authors: Clements, DL
Pearson, C
Farrah, D
Greenslade, J
Bernard-Salas, J
Gonzalez-Alfonso, E
Afonso, J
Efstathiou, A
Rigopoulou, D
Lebouteiller, V
Hurley, PD
Spoon, H
Item Type: Journal Article
Abstract: We present the Herschel-SPIRE photometric atlas for a complete flux limited sample of 43 local Ultraluminous Infrared Galaxies (ULIRGs), selected at 60${\mu}$m by IRAS, as part of the HERschel ULIRG Survey (HERUS). Photometry observations were obtained using the SPIRE instrument at 250, 350 and 500${\mu}$m. We describe these observations, present the results, and combine the new observations with data from IRAS to examine the far-IR spectral energy distributions (SEDs) of these sources. We fit the observed SEDs of HERUS objects with a simple parameterised modified black body model where temperature and emissivity $\beta$ are free parameters. We compare the fitted values to those of non-ULIRG local galaxies, and find, in agreement with earlier results, that HERUS ULIRGs have warmer dust (median temperature T = 37.9+/-4.7 K compared to 21.3+/-3.4 K) but a similar $\beta$ distribution (median $\beta$ = 1.7 compared to 1.8) to the Herschel reference sample (HRS, Cortese et al., 2014) galaxies. Dust masses are found to be in the range of 10^7.5 to 10^9 Msun significantly higher than that of Herschel Reference Sample (HRS) sources. We compare our results for local ULIRGs with higher redshift samples selected at 250 and 850${\mu}$m. These latter sources generally have cooler dust and/or redder 100-to-250 ${\mu}$m colours than our 60${\mu}$m-selected ULIRGs. We show that this difference may in part be the result of the sources being selected at different wavelengths rather than being a simple indication of rapid evolution in the properties of the population.
Issue Date: 14-Dec-2017
Date of Acceptance: 11-Dec-2017
URI: http://hdl.handle.net/10044/1/57015
DOI: https://dx.doi.org/10.1093/mnras/stx3227
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 2097
End Page: 2121
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 475
Issue: 2
Copyright Statement: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Imperial College Trust
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/F012373/1
ST/G001901/1
ST/G003874/1
ST/J004812/1
ST/J001368/1
N/A
ST/K006401/1
ST/M003558/1
ST/P000568/1
ST-N000838
ST/N000838/1
Keywords: astro-ph.GA
0201 Astronomical And Space Sciences
Astronomy & Astrophysics
Notes: Accepted for publication in MNRAS
Publication Status: Published
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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