University of Hertfordshire

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Colour matters : the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS. / Bourne, N.; Maddox, S.J.; Dunne, L.; Dye, S.; Eales, S.; Hoyos, C.; González-Nuevo, J.; Smith, Daniel; Valiante, E.; de Zotti, G.; Ivison, Rob J.; Rowlands, K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 444, No. 2, 21.10.2014, p. 1884-1892.

Research output: Contribution to journalArticlepeer-review

Harvard

Bourne, N, Maddox, SJ, Dunne, L, Dye, S, Eales, S, Hoyos, C, González-Nuevo, J, Smith, D, Valiante, E, de Zotti, G, Ivison, RJ & Rowlands, K 2014, 'Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS', Monthly Notices of the Royal Astronomical Society, vol. 444, no. 2, pp. 1884-1892. https://doi.org/10.1093/mnras/stu1582

APA

Bourne, N., Maddox, S. J., Dunne, L., Dye, S., Eales, S., Hoyos, C., González-Nuevo, J., Smith, D., Valiante, E., de Zotti, G., Ivison, R. J., & Rowlands, K. (2014). Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS. Monthly Notices of the Royal Astronomical Society, 444(2), 1884-1892. https://doi.org/10.1093/mnras/stu1582

Vancouver

Author

Bourne, N. ; Maddox, S.J. ; Dunne, L. ; Dye, S. ; Eales, S. ; Hoyos, C. ; González-Nuevo, J. ; Smith, Daniel ; Valiante, E. ; de Zotti, G. ; Ivison, Rob J. ; Rowlands, K. / Colour matters : the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 444, No. 2. pp. 1884-1892.

Bibtex

@article{4116fbf76d484c518522d104f5cae6a7,
title = "Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS",
abstract = "We report an unexpected variation in the positional offset distributions between Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources and their optical associations, depending on both 250-μm signal-to-noise ratio and 250/350-μm colour. We show that redder and brighter submm sources have optical associations with a broader distribution of positional offsets than would be expected if these offsets were due to random positional errors in the source extraction. The observation can be explained by two possible effects: either red submm sources trace a more clustered population than blue ones, and their positional errors are increased by confusion, or red submm sources are generally at high redshifts and are frequently associated with low-redshift lensing structures which are identified as false counterparts. We perform various analyses of the data, including the multiplicity of optical associations, the redshift and magnitude distributions in H-ATLAS in comparison to HerMES, and simulations of weak lensing, and we conclude that the effects are most likely to be explained by widespread weak lensing of Herschel-SPIRE sources by foreground structures. This has important consequences for counterpart identification and derived redshift distributions and luminosity functions of submm surveys",
keywords = "gravitational lensing: weak, galaxies: statistics, submillimetre: galaxies",
author = "N. Bourne and S.J. Maddox and L. Dunne and S. Dye and S. Eales and C. Hoyos and J. Gonz{\'a}lez-Nuevo and Daniel Smith and E. Valiante and {de Zotti}, G. and Ivison, {Rob J.} and K. Rowlands",
note = "Date of Acceptance: 04/08/2014",
year = "2014",
month = oct,
day = "21",
doi = "10.1093/mnras/stu1582",
language = "English",
volume = "444",
pages = "1884--1892",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",

}

RIS

TY - JOUR

T1 - Colour matters

T2 - the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS

AU - Bourne, N.

AU - Maddox, S.J.

AU - Dunne, L.

AU - Dye, S.

AU - Eales, S.

AU - Hoyos, C.

AU - González-Nuevo, J.

AU - Smith, Daniel

AU - Valiante, E.

AU - de Zotti, G.

AU - Ivison, Rob J.

AU - Rowlands, K.

N1 - Date of Acceptance: 04/08/2014

PY - 2014/10/21

Y1 - 2014/10/21

N2 - We report an unexpected variation in the positional offset distributions between Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources and their optical associations, depending on both 250-μm signal-to-noise ratio and 250/350-μm colour. We show that redder and brighter submm sources have optical associations with a broader distribution of positional offsets than would be expected if these offsets were due to random positional errors in the source extraction. The observation can be explained by two possible effects: either red submm sources trace a more clustered population than blue ones, and their positional errors are increased by confusion, or red submm sources are generally at high redshifts and are frequently associated with low-redshift lensing structures which are identified as false counterparts. We perform various analyses of the data, including the multiplicity of optical associations, the redshift and magnitude distributions in H-ATLAS in comparison to HerMES, and simulations of weak lensing, and we conclude that the effects are most likely to be explained by widespread weak lensing of Herschel-SPIRE sources by foreground structures. This has important consequences for counterpart identification and derived redshift distributions and luminosity functions of submm surveys

AB - We report an unexpected variation in the positional offset distributions between Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources and their optical associations, depending on both 250-μm signal-to-noise ratio and 250/350-μm colour. We show that redder and brighter submm sources have optical associations with a broader distribution of positional offsets than would be expected if these offsets were due to random positional errors in the source extraction. The observation can be explained by two possible effects: either red submm sources trace a more clustered population than blue ones, and their positional errors are increased by confusion, or red submm sources are generally at high redshifts and are frequently associated with low-redshift lensing structures which are identified as false counterparts. We perform various analyses of the data, including the multiplicity of optical associations, the redshift and magnitude distributions in H-ATLAS in comparison to HerMES, and simulations of weak lensing, and we conclude that the effects are most likely to be explained by widespread weak lensing of Herschel-SPIRE sources by foreground structures. This has important consequences for counterpart identification and derived redshift distributions and luminosity functions of submm surveys

KW - gravitational lensing: weak, galaxies: statistics, submillimetre: galaxies

U2 - 10.1093/mnras/stu1582

DO - 10.1093/mnras/stu1582

M3 - Article

VL - 444

SP - 1884

EP - 1892

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -