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ALMA observations of lensed Herschel sources: testing the dark matter halo paradigm

Amvrosiadis, A.; Eales, S.A.; Negrello, M.; Marchetti, L.; Smith, M.W.L.; Bourne, N.; Clements, D.L.; De Zotti, G.; Dunne, L.; Dye, S.; Furlanetto, C.; Ivison, R.J.; Maddox, S.J.; Valiante, E.; Baes, M.; Baker, A.J.; Cooray, A.; Crawford, S.M.; Frayer, D.; Harris, A.; Micha?owski, M.J.; Nayyeri, H.; Oliver, S.; Riechers, D.A.; Serjeant, S.; Vaccari, M.

ALMA observations of lensed Herschel sources: testing the dark matter halo paradigm Thumbnail


Authors

A. Amvrosiadis

S.A. Eales

M. Negrello

L. Marchetti

M.W.L. Smith

N. Bourne

D.L. Clements

G. De Zotti

L. Dunne

SIMON DYE Simon.Dye@nottingham.ac.uk
Associate Professor

C. Furlanetto

R.J. Ivison

S.J. Maddox

E. Valiante

M. Baes

A.J. Baker

A. Cooray

S.M. Crawford

D. Frayer

A. Harris

M.J. Micha?owski

H. Nayyeri

S. Oliver

D.A. Riechers

S. Serjeant

M. Vaccari



Abstract

With the advent of wide-area submillimetre surveys, a large number of high-redshift gravitationally lensed dusty star-forming galaxies have been revealed. Because of the simplicity of the selection criteria for candidate lensed sources in such surveys, identified as those with S500 μm > 100 mJy, uncertainties associated with the modelling of the selection function are expunged. The combination of these attributes makes submillimetre surveys ideal for the study of strong lens statistics. We carried out a pilot study of the lensing statistics of submillimetre-selected sources by making observations with the Atacama Large Millimeter Array (ALMA) of a sample of strongly lensed sources selected from surveys carried out with the Herschel Space Observatory. We attempted to reproduce the distribution of image separations for the lensed sources using a halo mass function taken from a numerical simulation that contains both dark matter and baryons. We used three different density distributions, one based on analytical fits to the haloes formed in the EAGLE simulation and two density distributions [Singular Isothermal Sphere (SIS) and SISSA] that have been used before in lensing studies. We found that we could reproduce the observed distribution with all three density distributions, as long as we imposed an upper mass transition of ∼1013 M⊙ for the SIS and SISSA models, above which we assumed that the density distribution could be represented by a Navarro–Frenk–White profile. We show that we would need a sample of ∼500 lensed sources to distinguish between the density distributions, which is practical given the predicted number of lensed sources in the Herschel surveys.

Citation

Amvrosiadis, A., Eales, S., Negrello, M., Marchetti, L., Smith, M., Bourne, N., …Vaccari, M. (2018). ALMA observations of lensed Herschel sources: testing the dark matter halo paradigm. Monthly Notices of the Royal Astronomical Society, 475(4), 4939-4952. https://doi.org/10.1093/mnras/sty138

Journal Article Type Article
Acceptance Date Jan 13, 2018
Publication Date Jan 22, 2018
Deposit Date Mar 7, 2018
Publicly Available Date Mar 7, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 475
Issue 4
Pages 4939-4952
DOI https://doi.org/10.1093/mnras/sty138
Keywords gravitational lensing: strong, galaxies: high-redshift, submillimetre: galaxies
Public URL https://nottingham-repository.worktribe.com/output/906304
Publisher URL https://academic.oup.com/mnras/article/475/4/4939/4819290
Additional Information 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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