University of Hertfordshire Research Archive

        JavaScript is disabled for your browser. Some features of this site may not work without it.

        Browse

        All of UHRABy Issue DateAuthorsTitlesThis CollectionBy Issue DateAuthorsTitles

        Arkivum Files

        My Downloads
        View Item 
        • UHRA Home
        • University of Hertfordshire
        • Research publications
        • View Item
        • UHRA Home
        • University of Hertfordshire
        • Research publications
        • View Item

        The dust and [CII] morphologies of redshift ~4.5 sub-millimeter galaxies at ~200pc resolution : The Absence of Large Clumps in the Interstellar Medium at High-redshift

        View/Open
        Gullberg_et_al_morphologies_of_redshift_Accepted_Manuscript.pdf (PDF, 2Mb)
        Author
        Gullberg, B.
        Swinbank, A. M.
        Smail, I.
        Biggs, A. D.
        Bertoldi, F.
        Breuck, C. De
        Chapman, S. C.
        Chen, C. -C.
        Cooke, E. A.
        Coppin, K. E. K.
        Cox, P.
        Dannerbauer, H.
        Dunlop, J. S.
        Edge, A. C.
        Farrah, D.
        Geach, J. E.
        Greve, T. R.
        Hodge, J.
        Ibar, E.
        Ivison, R. J.
        Karim, A.
        Schinnerer, E.
        Scott, D.
        Simpson, J. M.
        Stach, S. M.
        Thomson, A. P.
        Werf, P. van der
        Walter, F.
        Wardlow, J. L.
        Weiss, A.
        Attention
        2299/20220
        Abstract
        We present deep, high-resolution (0.″03, 200 pc) ALMA Band 7 observations covering the dust continuum and [C ii] λ157.7 μm emission in four z ∼4.4-4.8 sub-millimeter galaxies (SMGs) selected from the ALESS and AS2UDS surveys. The data show that the rest-frame 160 μm (observed 345 GHz) dust emission is consistent with smooth morphologies on kpc scales for three of the sources. One source, UDS 47.0, displays apparent substructure, but this is also consistent with a smooth morphology - as indicated by simulations showing that smooth exponential disks can appear clumpy when observed at the high angular resolution (0.″03) and depth of these observations ( μJy beam -1). The four SMGs are bright [C ii] emitters. We extract [C ii] spectra from the high-resolution data, and recover ∼20%-100% of the [C ii] flux and ∼40%-80% of the dust continuum emission, compared to the previous lower-resolution observations. When tapered to 0.″2 resolution, our maps recover ∼80%-100% of the continuum emission, indicating that ∼60% of the emission is resolved out on ∼200 pc scales. We find that the [C ii] emission in high-redshift galaxies is more spatially extended than the rest-frame 160 μm dust continuum by a factor of 1.6 ±0.4. By considering the / ratio as a function of the star formation rate surface density (), we revisit the [C ii] deficit and suggest that the decline in the / ratio as a function of is consistent with local processes. We also explore the physical drivers that may be responsible for these trends and can give rise to the properties found in the densest regions of SMGs.
        Publication date
        2018-05-17
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/aabe8c
        Other links
        http://hdl.handle.net/2299/20220
        Metadata
        Show full item record
        Keep in touch

        © 2019 University of Hertfordshire

        I want to...

        • Apply for a course
        • Download a Prospectus
        • Find a job at the University
        • Make a complaint
        • Contact the Press Office

        Go to...

        • Accommodation booking
        • Your student record
        • Bayfordbury
        • KASPAR
        • UH Arts

        The small print

        • Terms of use
        • Privacy and cookies
        • Criminal Finances Act 2017
        • Modern Slavery Act 2015
        • Sitemap

        Find/Contact us

        • T: +44 (0)1707 284000
        • E: ask@herts.ac.uk
        • Where to find us
        • Parking
        • hr
        • qaa
        • stonewall
        • AMBA
        • ECU Race Charter
        • disability confident
        • AthenaSwan