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[C II] and ^12CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly Lensed Interacting System at z = 5.24

Rawle, T.D.; Egami, E.; Bussmann, R.S.; Gurwell, M.; Ivison, R.J.; Boone, F.; Combes, F.; Danielson, A.L.R.; Rex, M.; Richard, J.; Smail, I.; Swinbank, A.M.; Altieri, B.; Blain, A.W.; Clement, B.; Dessauges-Zavadsky, M.; Edge, A.C.; Fazio, G.G.; Jones, T.; Kneib, J.-P.; Omont, A.; Pérez-González, P.G.; Schaerer, D.; Valtchanov, I.; van der Werf, P.P.; Walth, G.; Zamojski, M.; Zemcov, M.

[C II] and ^12CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly Lensed Interacting System at z = 5.24 Thumbnail


T.D. Rawle

E. Egami

R.S. Bussmann

M. Gurwell

R.J. Ivison

F. Boone

F. Combes

A.L.R. Danielson

M. Rex

J. Richard

B. Altieri

A.W. Blain

B. Clement

M. Dessauges-Zavadsky

G.G. Fazio

T. Jones

J.-P. Kneib

A. Omont

P.G. Pérez-González

D. Schaerer

I. Valtchanov

P.P. van der Werf

G. Walth

M. Zamojski

M. Zemcov


We present Submillimeter Array [C II] 158 μm and Karl G. Jansky Very Large Array 12CO(1-0) line emission maps for the bright, lensed, submillimeter source at z = 5.2430 behind A 773: HLSJ091828.6+514223 (HLS0918). We combine these measurements with previously reported line profiles, including multiple 12CO rotational transitions, [C I], water, and [N II], providing some of the best constraints on the properties of the interstellar medium in a galaxy at z > 5. HLS0918 has a total far-infrared (FIR) luminosity L FIR(8–1000 μm) = (1.6 ± 0.1) × 1014 L ☉ μ–1, where the total magnification μtotal = 8.9 ± 1.9, via a new lens model from the [C II] and continuum maps. Despite a HyLIRG luminosity, the FIR continuum shape resembles that of a local LIRG. We simultaneously fit all of the observed spectral line profiles, finding four components that correspond cleanly to discrete spatial structures identified in the maps. The two most redshifted spectral components occupy the nucleus of a massive galaxy, with a source-plane separation <1 kpc. The reddest dominates the continuum map (demagnified L FIR, component = (1.1 ± 0.2) × 1013 L ☉) and excites strong water emission in both nuclear components via a powerful FIR radiation field from the intense star formation. A third star-forming component is most likely a region of a merging companion (ΔV ~ 500 km s–1) exhibiting generally similar gas properties. The bluest component originates from a spatially distinct region and photodissociation region analysis suggests that it is lower density, cooler, and forming stars less vigorously than the other components. Strikingly, it has very strong [N II] emission, which may suggest an ionized, molecular outflow. This comprehensive view of gas properties and morphology in HLS0918 previews the science possible for a large sample of high-redshift galaxies once ALMA attains full sensitivity.

Journal Article Type Article
Publication Date Mar 1, 2014
Deposit Date Apr 15, 2014
Publicly Available Date Jun 23, 2014
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 783
Issue 1
Article Number 59
Keywords Galaxies: high-redshift, Galaxies: star formation, Submillimeter: galaxies.
Public URL


Published Journal Article (1.4 Mb)

Copyright Statement
© 2014. The American Astronomical Society. All rights reserved.

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