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

Rawle, T. D. and Zemcov, M. (2014) [C II] and ^(12)CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly Lensed Interacting System at z=5.24. Astrophysical Journal, 783 (1). Art. No. 59. ISSN 0004-637X. doi:10.1088/0004-637X/783/1/59.

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We present Submillimeter Array [C II] 158 μm and Karl G. Jansky Very Large Array ^(12)CO(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 ^(12)CO 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) × 10^(14) L_☉ μ^(–1), where the total magnification μ_(total) = 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) × 10^(13) 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.

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Zemcov, M.0000-0001-8253-1451
Additional Information:© 2014 American Astronomical Society. Received 2013 June 7; accepted 2014 January 14; published 2014 February 13. T.D.R. is supported by a European Space Agency (ESA) Research Fellowship at the European Space Astronomy Centre (ESAC), in Madrid, Spain. I.R.S. acknowledges support from STFC, a Leverhulme Fellowship, the ERC Advanced Investigator program DUSTYGAL 321334, and a Royal Society/Wolfson Merit Award. The authors acknowledge fruitful discussions within the international team lead by D. Schaerer on “Exploiting the Multi-Wavelength Lensing Survey” at ISSI (International Space Science Institute) in Bern 2010–2013. The Submillimeter Array is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica. This work also includes observations carried out with the Karl G. Jansky Very Large Array (VLA): The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Additionally, based on observations carried out with the IRAM Plateau de Bure Interferometer and the IRAM 30 m Telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). This work follows on from observations made with the Herschel Space Observatory, a European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. We would also like to thank the HSC and NHSC consortia for support with data reduction.
Funding AgencyGrant Number
European Space Astronomy Centre (ESAC) European Space Agency (ESA) Research Fellowship (Spain)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Leverhulme FellowshipUNSPECIFIED
European Research Council (ERC)321334
Royal Society/Wolfson Merit AwardUNSPECIFIED
Smithsonian InstitutionUNSPECIFIED
Academia SinicaUNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Subject Keywords:galaxies: high-redshift; galaxies: star formation; submillimeter: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20140603-082430143
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Official Citation:[C II] and 12CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly Lensed Interacting System at z = 5.24 T. D. Rawle et al. 2014 ApJ 783 59
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46039
Deposited By: Ruth Sustaita
Deposited On:03 Jun 2014 16:10
Last Modified:10 Nov 2021 17:19

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