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

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journal contribution
posted on 2023-06-09, 22:05 authored by J Wagg, M Aravena, D Brisbin, I Valtchanov, C Carilli, E Daddi, H Dannerbauer, R Decarli, T Díaz-Santos, D Riechers, Mark Sargent, F Walter
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.

Funding

University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

2

Volume

499

Page range

1788-1794

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2020-11-09

First Open Access (FOA) Date

2020-11-09

First Compliant Deposit (FCD) Date

2020-11-06

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