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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