Observations of [OI]63-=μm line emission in main-sequence galaxies at z ∼ 1.5

Wagg, J, Aravena, M, Brisbin, D, Valtchanov, I, Carilli, C, Daddi, E, Dannerbauer, H, Decarli, R, Díaz-Santos, T, Riechers, D, Sargent, M and Walter, F (2020) Observations of [OI]63-=μm line emission in main-sequence galaxies at z ∼ 1.5. Monthly Notices of the Royal Astronomical Society, 499 (2). pp. 1788-1794. ISSN 0035-8711

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We present Herschel-PACS spectroscopy of four main-sequence star-forming galaxies at z ∼ 1.5. We detect [OI]63-=μm line emission in BzK-21000 at z = 1.5213, and measure a line luminosity, L[OI]63μm=(3.9±0.7)×109 -=L☉. Our PDR modelling of the interstellar medium in BzK-21000 suggests a UV radiation field strength, G ∼ 320G0, and gas density, n ∼ 1800-=cm-3, consistent with previous LVG modelling of the molecular CO line excitation. The other three targets in our sample are individually undetected in these data, and we perform a spectral stacking analysis which yields a detection of their average emission and an [O-=I]63-=μm line luminosity, L[OI]63μm=(1.1±0.2)×109 -=L☉. We find that the implied luminosity ratio, L[OI]63μm/LIR , of the undetected BzK-selected star-forming galaxies broadly agrees with that of low-redshift star-forming galaxies, while BzK-21000 has a similar ratio to that of a dusty star-forming galaxy at z ∼ 6. The high [O-=I]63-=μm line luminosities observed in BzK-21000 and the z ∼ 1-3 dusty and sub-mm luminous star-forming galaxies may be associated with extended reservoirs of low density, cool neutral gas.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 09 Nov 2020 08:23
Last Modified: 25 Feb 2022 13:03
URI: http://sro.sussex.ac.uk/id/eprint/94860

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Project NameSussex Project NumberFunderFunder Ref
University of Sussex Astronomy Consolidated Grant 2017-2020G2050STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000525/1