Imperial College London
Alternate

ProfessorDanielMortlock

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics and Statistics
 
 
 
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Contact

 

+44 (0)20 7594 7878d.mortlock Website

 
 
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Location

 

1018ABlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bosman:2017:mnras/stx1305,
author = {Bosman, SEI and Becker, GD and Haehnelt, MG and Hewett, PC and McMahon, RG and Mortlock, DJ and Simpson, C and Venemans, BP},
doi = {mnras/stx1305},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {1919--1934},
title = {A deep search for metals near redshift 7: the line of sight towards ULAS J1120+0641},
url = {http://dx.doi.org/10.1093/mnras/stx1305},
volume = {470},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present a search for metal absorption line systems at the highest redshifts to date using a deep (30 h) Very Large Telescope/X-Shooter spectrum of the z = 7.084 quasi-stellar object (QSO) ULAS J1120+0641. We detect seven intervening systems at z > 5.5, with the highest redshift system being a C iv absorber at z = 6.51. We find tentative evidence that the mass density of C iv remains flat or declines with redshift at z < 6, while the number density of C ii systems remains relatively flat over 5 < z < 7. These trends are broadly consistent with models of chemical enrichment by star formation-driven winds that include a softening of the ultraviolet background towards higher redshifts. We find a larger number of weak (Wrest < 0.3 Å) Mg ii systems over 5.9 < z < 7.0 than predicted by a power-law fit to the number density of stronger systems. This is consistent with trends in the number density of weak Mg ii systems at z  2.5, and suggests that the mechanisms that create these absorbers are already in place at z ∼ 7. Finally, we investigate the associated narrow Si iv, C iv and N v absorbers located near the QSO redshift, and find that at least one component shows evidence of partial covering of the continuum source.
AU  - Bosman,SEI
AU  - Becker,GD
AU  - Haehnelt,MG
AU  - Hewett,PC
AU  - McMahon,RG
AU  - Mortlock,DJ
AU  - Simpson,C
AU  - Venemans,BP
DO  - mnras/stx1305
EP  - 1934
PY  - 2017///
SN  - 0035-8711
SP  - 1919
TI  - A deep search for metals near redshift 7: the line of sight towards ULAS J1120+0641
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stx1305
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000406839900047&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/57878
VL  - 470
ER  -
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