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The molecular-gas properties in the gravitationally lensed merger HATLAS J142935.3-002836

Messias, Hugo; Nagar, Neil; Zhang, Zhi-Yu; Oteo, Iv�n; Dye, Simon; Ibar, Eduardo; Timmons, Nicholas; Van Der Werf, Paul; Riechers, Dominik; Eales, Stephen; Ivison, Rob; Maresca, Jacob; Michalowski, J.; Yang, Chentao


Hugo Messias

Neil Nagar

Zhi-Yu Zhang

Iv�n Oteo

Associate Professor

Eduardo Ibar

Nicholas Timmons

Paul Van Der Werf

Dominik Riechers

Stephen Eales

Rob Ivison

Jacob Maresca

J. Michalowski

Chentao Yang


Follow-up observations of (sub-)mm-selected gravitationally-lensed systems have allowed a more detailed study of the dust-enshrouded phase of star-formation up to very early cosmic times. Here, the case of the gravitationally lensed merger in HATLAS J142935.3-002836 (also known as H1429-0028; z_lens=0.218, z_bkg=1.027) is revisited following recent developments in the literature and new APEX observations targeting two carbon monoxide (CO) rotational transitions J_up=3 and 6. We show that the line-profiles comprise three distinct velocity components, where the fainter high-velocity one is less magnified and more compact. The modelling of the observed spectral line energy distribution of CO J_up=2 to 6 and [CI]3P_1-3P_0 assumes a large velocity gradient scenario, where the analysis is based on four statistical approaches. Since the detected gas and dust emission comes exclusively from only one of the two merging components (the one oriented North-South, NS), we are only able to determine upper-limits for the companion. The molecular gas in the NS component in H1429-0028 is found to have a temperature of ~70K, a volume density of log(n[/cm3])~3.7, to be expanding at ~10km/s/pc, and amounts to M_H2=4(-2,+3)*1e9 Msun. The CO to H2 conversion factor is estimated to be alpha_CO=0.4(-0.2,+0.3) Msun/( The NS galaxy is expected to have a factor of >10x more gas than its companion (M_H2


Messias, H., Nagar, N., Zhang, Z., Oteo, I., Dye, S., Ibar, E., …Yang, C. (2019). The molecular-gas properties in the gravitationally lensed merger HATLAS J142935.3-002836. Monthly Notices of the Royal Astronomical Society, 486(2), 2366-2378.

Journal Article Type Article
Acceptance Date Mar 28, 2019
Online Publication Date Apr 18, 2019
Publication Date 2019-06
Deposit Date Apr 18, 2019
Publicly Available Date Apr 25, 2019
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 486
Issue 2
Pages 2366-2378
Keywords Gravitational lensing: strong; Galaxies: interactions; Submillimeter: galaxies; Submillimeter: ISM; Abundances
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Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved


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