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    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Cosmic happenstance: 24-μm selected, multicomponent Herschel sources are line-of-sight projections

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Cosmic happenstance: 24-μm selected, multicomponent Herschel sources are line-of-sight projections. / Scudder, Jillian M.; Oliver, Seb; Hurley, Peter D. et al.
In: Monthly Notices of the Royal Astronomical Society, Vol. 480, No. 3, 01.11.2018, p. 4124-4137.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Scudder, JM, Oliver, S, Hurley, PD, Wardlow, JL, Wang, L & Farrah, D 2018, 'Cosmic happenstance: 24-μm selected, multicomponent Herschel sources are line-of-sight projections', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 3, pp. 4124-4137. https://doi.org/10.1093/mnras/sty2009

APA

Scudder, J. M., Oliver, S., Hurley, P. D., Wardlow, J. L., Wang, L., & Farrah, D. (2018). Cosmic happenstance: 24-μm selected, multicomponent Herschel sources are line-of-sight projections. Monthly Notices of the Royal Astronomical Society, 480(3), 4124-4137. https://doi.org/10.1093/mnras/sty2009

Vancouver

Scudder JM, Oliver S, Hurley PD, Wardlow JL, Wang L, Farrah D. Cosmic happenstance: 24-μm selected, multicomponent Herschel sources are line-of-sight projections. Monthly Notices of the Royal Astronomical Society. 2018 Nov 1;480(3):4124-4137. Epub 2018 Aug 1. doi: 10.1093/mnras/sty2009

Author

Scudder, Jillian M. ; Oliver, Seb ; Hurley, Peter D. et al. / Cosmic happenstance : 24-μm selected, multicomponent Herschel sources are line-of-sight projections. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 480, No. 3. pp. 4124-4137.

Bibtex

@article{1cf3b29b77404878a942b1c35bb9bb2d,
title = "Cosmic happenstance: 24-μm selected, multicomponent Herschel sources are line-of-sight projections",
abstract = "In this paper, we investigate the physical associations between blended far-infrared (FIR)-emitting galaxies, in order to identify the level of line-of-sight projection contamination in the single-dish Herschel data. Building on previous work, and as part of the Herschel Extragalactic Legacy Project, we identify a sample of galaxies in the COSMOS field, which are found to be both FIR-bright (typically ˜15 mJy) and blended within the Herschel 250-μ m beam. We identify a spectroscopic or photometric redshift for each FIR-bright source. We conduct a joint probability distribution analysis on the redshift probability density functions to determine the fraction of the FIR sources with multiple FIR-bright counterparts that are likely to be found at consistent (Δz <0.01) redshifts. We find that only three (0.4 per cent) of the pair permutations between counterparts are >50 per cent likely to be at consistent redshifts. A majority of counterparts (72 per cent) have no overlap in their redshift probability distributions whatsoever. This is in good agreement with the results of recent simulations, which indicate that single-dish observations of the FIR sky should be strongly contaminated by line-of-sight projection effects. We conclude that for our sample of 3.6- and 24-μ m selected, FIR-bright objects in the COSMOS field, the overwhelming majority of multicomponent FIR systems are line-of-sight projections within the 18.1-arcsec Herschel beam, rather than physical associations.",
keywords = "galaxies: high redshift, galaxies: starburst, galaxies: star formation, galaxies: statistics",
author = "Scudder, {Jillian M.} and Seb Oliver and Hurley, {Peter D.} and Wardlow, {Julie L.} and Lingyu Wang and Duncan Farrah",
note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society {\textcopyright}: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",
year = "2018",
month = nov,
day = "1",
doi = "10.1093/mnras/sty2009",
language = "English",
volume = "480",
pages = "4124--4137",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "3",

}

RIS

TY - JOUR

T1 - Cosmic happenstance

T2 - 24-μm selected, multicomponent Herschel sources are line-of-sight projections

AU - Scudder, Jillian M.

AU - Oliver, Seb

AU - Hurley, Peter D.

AU - Wardlow, Julie L.

AU - Wang, Lingyu

AU - Farrah, Duncan

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - In this paper, we investigate the physical associations between blended far-infrared (FIR)-emitting galaxies, in order to identify the level of line-of-sight projection contamination in the single-dish Herschel data. Building on previous work, and as part of the Herschel Extragalactic Legacy Project, we identify a sample of galaxies in the COSMOS field, which are found to be both FIR-bright (typically ˜15 mJy) and blended within the Herschel 250-μ m beam. We identify a spectroscopic or photometric redshift for each FIR-bright source. We conduct a joint probability distribution analysis on the redshift probability density functions to determine the fraction of the FIR sources with multiple FIR-bright counterparts that are likely to be found at consistent (Δz <0.01) redshifts. We find that only three (0.4 per cent) of the pair permutations between counterparts are >50 per cent likely to be at consistent redshifts. A majority of counterparts (72 per cent) have no overlap in their redshift probability distributions whatsoever. This is in good agreement with the results of recent simulations, which indicate that single-dish observations of the FIR sky should be strongly contaminated by line-of-sight projection effects. We conclude that for our sample of 3.6- and 24-μ m selected, FIR-bright objects in the COSMOS field, the overwhelming majority of multicomponent FIR systems are line-of-sight projections within the 18.1-arcsec Herschel beam, rather than physical associations.

AB - In this paper, we investigate the physical associations between blended far-infrared (FIR)-emitting galaxies, in order to identify the level of line-of-sight projection contamination in the single-dish Herschel data. Building on previous work, and as part of the Herschel Extragalactic Legacy Project, we identify a sample of galaxies in the COSMOS field, which are found to be both FIR-bright (typically ˜15 mJy) and blended within the Herschel 250-μ m beam. We identify a spectroscopic or photometric redshift for each FIR-bright source. We conduct a joint probability distribution analysis on the redshift probability density functions to determine the fraction of the FIR sources with multiple FIR-bright counterparts that are likely to be found at consistent (Δz <0.01) redshifts. We find that only three (0.4 per cent) of the pair permutations between counterparts are >50 per cent likely to be at consistent redshifts. A majority of counterparts (72 per cent) have no overlap in their redshift probability distributions whatsoever. This is in good agreement with the results of recent simulations, which indicate that single-dish observations of the FIR sky should be strongly contaminated by line-of-sight projection effects. We conclude that for our sample of 3.6- and 24-μ m selected, FIR-bright objects in the COSMOS field, the overwhelming majority of multicomponent FIR systems are line-of-sight projections within the 18.1-arcsec Herschel beam, rather than physical associations.

KW - galaxies: high redshift

KW - galaxies: starburst

KW - galaxies: star formation

KW - galaxies: statistics

U2 - 10.1093/mnras/sty2009

DO - 10.1093/mnras/sty2009

M3 - Journal article

VL - 480

SP - 4124

EP - 4137

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -