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    [C II] emission in z ~ 6 strongly lensed, star-forming galaxies

    Access Status
    Fulltext not available
    Authors
    Knudsen, K.
    Richard, J.
    Kneib, J.
    Jauzac, M.
    Clement, B.
    Drouart, Guillaume
    Egami, E.
    Lindroos, L.
    Date
    2016
    Collection
    • Curtin Research Publications
    Type
    Journal Article
    Metadata
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    Abstract

    The far-infrared fine-structure line [C ii] at 1900.5 GHz is known to be one of the brightest cooling lines in local galaxies, and therefore it has been suggested to be an efficient tracer for star formation in very high redshift galaxies. However, recent results for galaxies at z > 6 have yielded numerous non-detections in star-forming galaxies, except for quasars and submillimetre galaxies. We report the results of ALMA observations of two lensed, star-forming galaxies at z = 6.029 and z = 6.703. The galaxy A383-5.1 (star formation rate [SFR] of 3.2 M☉ yr−1 and magnification of μ = 11.4 ± 1.9) shows a line detection with L[CII]=8.9×106 L L☉, making it the lowest L[CII] detection at z > 6. For MS0451-H (SFR = 0.4 M☉ yr−1 and μ = 100 ± 20) we provide an upper limit of L[CII]<3×105 L☉, which is 1 dex below the local SFR–L[CII] relations. The results are consistent with predictions for low-metallicity galaxies at z > 6; however, other effects could also play a role in terms of decreasing L[CII]. The detection of A383-5.1 is encouraging and suggests that detections are possible, but much fainter than initially predicted.

    Citation
    Knudsen, K. and Richard, J. and Kneib, J. and Jauzac, M. and Clement, B. and Drouart, G. and Egami, E. et al. 2016. [C II] emission in z ~ 6 strongly lensed, star-forming galaxies. Monthly Notices of the Royal Astronomical Society: Letters. 462 (1): pp. L6-L10.
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    URI
    http://hdl.handle.net/20.500.11937/23388
    DOI
    10.1093/mnrasl/slw114
    Department
    Curtin Institute of Radio Astronomy (Physics)

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