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The multiplicity of 250-μm Herschel sources in the COSMOS field

Scudder, Jillian M., Oliver, Seb, Hurley, Peter D., Griffin, Matthew Joseph ORCID: https://orcid.org/0000-0002-0033-177X, Sargent, Mark T., Scott, Douglas, Wang, Lingyu and Wardlow, Julie L. 2016. The multiplicity of 250-μm Herschel sources in the COSMOS field. Monthly Notices of the Royal Astronomical Society 460 (1) , pp. 1119-1130. 10.1093/mnras/stw1044

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Abstract

We investigate the multiplicity of extragalactic sources detected by the Herschel Space Observatory in the COSMOS field. Using 3.6- and 24-μm catalogues, in conjunction with 250-μm data from Herschel, we seek to determine if a significant fraction of Herschel sources are composed of multiple components emitting at 250 μm.We use the XID+ code, using Bayesian inference methods to produce probability distributions of the possible contributions to the observed 250-μm flux for each potential component. The fraction of Herschel flux assigned to the brightest component is highest for sources with total 250-μm fluxes <45 mJy; however, the flux in the brightest component is still highest in the brightest Herschel sources. The faintest 250-μm sources (30–45 mJy) have the majority of their flux assigned to a single bright component; the second brightest component is typically significantly weaker, and contains the remainder of the 250-μm source flux. At the highest 250-μm fluxes (45–110 mJy), the brightest and second brightest components are assigned roughly equal fluxes, and together are insufficient to reach 100 per cent of the 250-μm source flux. This indicates that additional components are required, beyond the brightest two components, to reproduce the observed flux. 95 per cent of the sources in our sample have a second component that contains more than 10 per cent of the total source flux. Particularly for the brightest Herschel sources, assigning the total flux to a single source may overestimate the flux contributed by around 150 per cent.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: galaxies: high redshift – galaxies: photometry – galaxies: statistics.
Publisher: Oxford University Press
ISSN: 0035-8711
Funders: European Union FP7
Date of First Compliant Deposit: 1 November 2016
Date of Acceptance: 29 April 2016
Last Modified: 05 May 2023 11:47
URI: https://orca.cardiff.ac.uk/id/eprint/92369

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