Imperial College London
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Dr Clements

Faculty of Natural Sciences, Department of Physics

Reader in Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7693d.clements

 
 
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Location

 

1011Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Negrello:2017:mnras/stx1367,
author = {Negrello, M and Gonzalez-Nuevo, J and De, Zotti G and Bonato, M and Cai, ZY and Clements, D and Danese, L and Dole, H and Greenslade, J and Lapi, A and Montier, L},
doi = {mnras/stx1367},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {2253--2261},
title = {On the statistics of proto-cluster candidates detected in the Planck all-sky survey},
url = {http://dx.doi.org/10.1093/mnras/stx1367},
volume = {470},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Observational investigations of the abundance of massive precursors of local galaxy clusters ('proto-clusters') allow us to test the growth of density perturbations, to constrain cosmological parameters that control it, to test the theory of non-linear collapse and how the galaxy formation takes place in dense environments. The Planck collaboration has recently published a catalogue of 2000 cold extragalactic sub-millimeter sources, i.e. with colours indicative of z  2, almost all of which appear to be overdensities of star-forming galaxies. They are thus considered as proto-cluster candidates. Their number densities (or their flux densities) are far in excess of expectations from the standard scenario for the evolution of large-scale structure. Simulations based on a physically motivated galaxy evolution model show that essentially all cold peaks brighter than S545GHz= 500 mJy found in Planck maps after having removed the Galactic dust emission can be interpreted as positive Poisson fluctuations of the number of high-z dusty proto-clusters within the same Planck beam, rather then being individual clumps of physically bound galaxies. This conclusion does not change if an empirical fit to the luminosity function of dusty galaxies is used instead of the physical model. The simulations accurately reproduce the statistic of the Planck detections and yield distributions of sizes and ellipticities in qualitative agreement with observations. The redshift distribution of the brightest proto-clusters contributing to the cold peaks has a broad maximum at 1.5 ≤ z ≤ 3. Therefore follow-up of Planck proto-cluster candidates will provide key information on the high-z evolution of large scale structure.
AU  - Negrello,M
AU  - Gonzalez-Nuevo,J
AU  - De,Zotti G
AU  - Bonato,M
AU  - Cai,ZY
AU  - Clements,D
AU  - Danese,L
AU  - Dole,H
AU  - Greenslade,J
AU  - Lapi,A
AU  - Montier,L
DO  - mnras/stx1367
EP  - 2261
PY  - 2017///
SN  - 0035-8711
SP  - 2253
TI  - On the statistics of proto-cluster candidates detected in the Planck all-sky survey
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stx1367
UR  - http://hdl.handle.net/10044/1/60567
VL  - 470
ER  -
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