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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. and Egami, E. and Bussmann, R.S. and Gurwell, M. and Ivison, R.J. and Boone, F. and Combes, F. and Danielson, A.L.R. and Rex, M. and Richard, J. and Smail, I. and Swinbank, A.M. and Altieri, B. and Blain, A.W. and Clement, B. and Dessauges-Zavadsky, M. and Edge, A.C. and Fazio, G.G. and Jones, T. and Kneib, J.-P. and Omont, A. and Pérez-González, P.G. and Schaerer, D. and Valtchanov, I. and van der Werf, P.P. and Walth, G. and Zamojski, M. and Zemcov, M. (2014) '[C II] and 12CO(1-0) emission maps in HLSJ091828.6+514223 : a strongly lensed interacting system at z = 5.24.', Astrophysical journal., 783 (1). p. 59.


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.

Item Type:Article
Keywords:Galaxies: high-redshift, Galaxies: star formation, Submillimeter: galaxies.
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Publisher statement:© 2014. The American Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:23 June 2014
Date of first online publication:March 2014
Date first made open access:No date available

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