AKARI and IRAS: From beam corrections to SEDs

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Title: AKARI and IRAS: From beam corrections to SEDs
Authors: Clements, DL
Rowan-Robinson, M
Pearson, C
Afonso, J
Labouteiller, V
Farrah, D
Efstathiou, A
Greenslade, J
Wang, L
Item Type: Journal Article
Abstract: There is significant scientific value to be gained from combining AKARI fluxes with data at other far-infrared (IR) wavelengths from the Infrared Astronomical Satellite (IRAS) and Herschel missions. To be able to do this we must ensure that there are no systematic differences between the data sets that need to be corrected before the fluxes are compatible with each other. One such systematic effect identified in the Bright Source Catalog version 1 (BSCv1) data is the issue of beam corrections. We determine these for the BSC version 2 (BSCv2) data by correlating ratios of appropriate IRAS and AKARI bands with the difference in 2 Micron All Sky Survey (2MASS) J-band extended and point source magnitudes for sources cross-matched between the IRAS Faint Source Catalog (FSC), AKARI BSCv2 and 2MASS catalogs. We find significant correlations (p ≪ 10 −13) indicating that beam corrections are necessary in the 65 and 90 μm bands. We then use these corrected fluxes to supplement existing data in spectral energy distribution (SED) fits for ultraluminous infrared galaxies (ULIRGs) in the Herschel ULIRG Survey (HERUS). The addition of AKARI fluxes makes little difference to the results of simple (T, β) fits to the SEDs of these sources, though there is a general decrease in reduced χ2 values. The utility of the extra AKARI data, however, is in allowing physically more realistic SED models with more parameters to be fitted to the data. We also extend our analysis of beam correction issues in the AKARI data by examining the Herschel Reference Sample (HRS) galaxies, which have Herschel photometry from 100 to 500 μm and which are more spatially extended than the HERUS ULIRGs. 34 of the HRS sources have good Herschel SEDs and matching data from AKARI. This investigation finds that our simple 2MASS-based beam correction scheme is inadequate for these larger and more complex sources. There are also indications that additional beam corrections at 140 and 160 μm are needed for these sources, extended on scales >1′.
Issue Date: 31-Jan-2019
Date of Acceptance: 4-Aug-2018
ISSN: 2053-051X
Publisher: Oxford University Press (OUP)
Journal / Book Title: Publications of the Astronomical Society of Japan (PASJ)
Volume: 71
Issue: 1
Copyright Statement: ©The Author(s) 2018. This is a pre-copy-editing, author-produced version of an article accepted for publication in Publications of Astronomical Society of Japan following peer review. The definitive publisher-authenticated version David L Clements, Michael Rowan-Robinson, Chris Pearson, Jose Afonso, Vianney Labouteiller, Duncan Farrah, Andreas Efstathiou, Josh Greenslade, Lingyu Wang; AKARI and IRAS: From beam corrections to SEDs, Publications of the Astronomical Society of Japan, Volume 71, Issue 1, 1 January 2019, 7, is available online at:
Sponsor/Funder: Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST-N000838
Keywords: astro-ph.GA
0201 Astronomical And Space Sciences
Astronomy & Astrophysics
Publication Status: Published
Online Publication Date: 2018-10-10
Appears in Collections:Physics
Faculty of Natural Sciences

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