Jillian M. Scudder
The multiplicity of 250-μm Herschel sources in the COSMOS field
Scudder, Jillian M.; Oliver, Seb; Hurley, Peter D.; Griffin, Matt; Sargent, Mark T.; Scott, Douglas; Wang, Lingyu; Wardlow, Julie L.
Authors
Seb Oliver
Peter D. Hurley
Matt Griffin
Mark T. Sargent
Douglas Scott
Lingyu Wang
Julie L. Wardlow
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.
Citation
Scudder, J. M., Oliver, S., Hurley, P. D., Griffin, M., Sargent, M. T., Scott, D., …Wardlow, J. L. (2016). The multiplicity of 250-μm Herschel sources in the COSMOS field. Monthly Notices of the Royal Astronomical Society, 460(1), 1119-1130. https://doi.org/10.1093/mnras/stw1044
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 29, 2016 |
Online Publication Date | May 3, 2016 |
Publication Date | Jul 21, 2016 |
Deposit Date | May 3, 2017 |
Publicly Available Date | May 3, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 460 |
Issue | 1 |
Pages | 1119-1130 |
DOI | https://doi.org/10.1093/mnras/stw1044 |
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Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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