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{Marques-Chaves:2019:0004-6361/201936013,
author = {Marques-Chaves, R and Perez-Fournon, I and Villar-Martin, M and Gavazzi, R and Riechers, D and Rigopoulou, D and Wardlow, J and Cabrera-Lavers, A and Clements, DL and Colina, L and Cooray, A and Farrah, D and Ivison, RJ and Jimenez-Angel, C and Martinez-Navajas, P and Nayyeri, H and Oliver, S and Omont, A and Scott, D and Shu, Y},
doi = {0004-6361/201936013},
journal = {Astronomy and Astrophysics: a European journal},
pages = {1--12},
title = {Discovery of a giant and luminous Ly alpha plus C IV plus He II nebula at z=3.326 with extreme emission line ratios},
url = {http://dx.doi.org/10.1051/0004-6361/201936013},
volume = {629},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present the discovery of HLock01-LAB, a luminous and large Lyα nebula at z=3.326. Medium-band imaging and long-slit spectroscopic observations with the Gran Telescopio Canarias reveal extended emission in the Lyα 1215 Å, CIV 1550 Å, and HeII 1640 Å lines over ∼100 kpc, and a total luminosity LLyα=(6.4±0.1)×1044 erg s−1. HLock01-LAB presents an elongated morphology aligned with two faint radio sources contained within the central ∼8 kpc of the nebula. The radio structures are consistent with faint radio jets or lobes of a central galaxy, whose spectrum shows nebular emission characteristic of a type-II active galactic nucleus (AGN). The continuum emission of the AGN at short wavelengths is however likely dominated by stellar emission of the host galaxy, for which we derive a stellar mass M2.3×1011M. Our kinematic analysis shows that the ionized gas is perturbed almost exclusively in the inner region between the radio structures, probably as a consequence of jet–gas interactions, whereas in the outer regions the ionized gas appears more quiescent. The detection of extended emission in CIV and C III] indicates that the gas within the nebula is not primordial. Feedback may have enriched the halo at at least 50 kpc from the nuclear region. Using rest-frame UV emission-line diagnostics, we find that the gas in the nebula is likely heated by the AGN. Nevertheless, at the center of the nebula we find extreme emission line ratios of Lyα/CIV ∼60 and Lyα/HeII ∼80, one of the highest values measured to date, and well above the standard values of photoionization models (Lyα/HeII ∼30 for case B photoionization). Our data suggest that jet-induced shocks are likely responsible for the increase of the electron temperature and, thus, the observed Lyα enhancement in the center of the nebula. This scenario is further supported by the presence of radio st
AU  - Marques-Chaves,R
AU  - Perez-Fournon,I
AU  - Villar-Martin,M
AU  - Gavazzi,R
AU  - Riechers,D
AU  - Rigopoulou,D
AU  - Wardlow,J
AU  - Cabrera-Lavers,A
AU  - Clements,DL
AU  - Colina,L
AU  - Cooray,A
AU  - Farrah,D
AU  - Ivison,RJ
AU  - Jimenez-Angel,C
AU  - Martinez-Navajas,P
AU  - Nayyeri,H
AU  - Oliver,S
AU  - Omont,A
AU  - Scott,D
AU  - Shu,Y
DO  - 0004-6361/201936013
EP  - 12
PY  - 2019///
SN  - 0004-6361
SP  - 1
TI  - Discovery of a giant and luminous Ly alpha plus C IV plus He II nebula at z=3.326 with extreme emission line ratios
T2  - Astronomy and Astrophysics: a European journal
UR  - http://dx.doi.org/10.1051/0004-6361/201936013
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000482760200003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.aanda.org/articles/aa/abs/2019/09/aa36013-19/aa36013-19.html
UR  - http://hdl.handle.net/10044/1/80473
VL  - 629
ER  -
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