期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 460, 期 1, 页码 1119-1130出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1044
关键词
galaxies: high redshift; galaxies: photometry; galaxies: statistics
资金
- Science and Technology Facilities Council [ST/L000652/1]
- European Union COFUND/Durham Junior Research Fellowship under EU grant [267209]
- STFC [ST/L00075X/1]
- European Union [607254]
- CSA (Canada)
- NAOC (China)
- CEA (France)
- CNES (France)
- CNRS (France)
- ASI (Italy)
- MCINN (Spain)
- SNSB (Sweden)
- STFC (UK)
- UKSA (UK)
- NASA (USA)
- NASA
- Science and Technology Facilities Council [ST/L000652/1, ST/L00075X/1] Funding Source: researchfish
- STFC [ST/L00075X/1, ST/L000652/1, ST/K000926/1, ST/N000706/1] Funding Source: UKRI
We investigate the multiplicity of extragalactic sources detected by the Herschel Space Observatory in the COSMOS field. Using 3.6- and 24-mu m catalogues, in conjunction with 250-mu m data from Herschel, we seek to determine if a significant fraction of Herschel sources are composed of multiple components emitting at 250 mu m. We use the xid+ code, using Bayesian inference methods to produce probability distributions of the possible contributions to the observed 250-mu m flux for each potential component. The fraction of Herschel flux assigned to the brightest component is highest for sources with total 250-mu m fluxes < 45 mJy; however, the flux in the brightest component is still highest in the brightest Herschel sources. The faintest 250-mu m 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-mu m source flux. At the highest 250-mu m 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-mu m 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.
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