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        [NII] fine-structure emission at 122 and 205um in a galaxy at z=2.6: a globally dense star-forming interstellar medium

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        2010.15128v1.pdf (PDF, 1Mb)
        Author
        Doherty, M. J.
        Geach, J. E.
        Ivison, R. J.
        Dye, S.
        Attention
        2299/23781
        Abstract
        We present new observations with the Atacama Large Millimeter/sub-millimeter Array of the 122um and 205um fine-structure line emission of singly-ionised nitrogen in a strongly lensed starburst galaxy at z=2.6. The 122/205um [NII] line ratio is sensitive to electron density, n_e, in the ionised interstellar medium, and we use this to measure n_e~300cm^-3 averaged across the galaxy. This is over an order of magnitude higher than the Milky Way average, but comparable to localised Galactic star-forming regions. Combined with observations of the atomic carbon (CI(1-0)) and carbon monoxide (CO(4-3)) in the same system, we reveal the conditions in this intensely star-forming system. The majority of the molecular interstellar medium has been driven to high density, and the resultant conflagration of star formation produces a correspondingly dense ionised phase, presumably co-located with myriad HII regions that litter the gas-rich disk.
        Publication date
        2020-12-23
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/abc5b9
        Other links
        http://hdl.handle.net/2299/23781
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