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IRAM 30m-EMIR redshift search of z = 3-4 lensed dusty starbursts selected from the HerBS sample

Bakx, T. J. L. C., Dannerbauer, H., Frayer, D., Eales, S. A. ORCID:, Pérez-Fournon, I., Cai, Z. -Y., Clements, D. L., De Zotti, G., González-Nuevo, J., Ivison, R. J., Lapi, A., Michałowski, M .J., Negrello, M. ORCID:, Serjeant, S., Smith, M. W. L. ORCID:, Temi, P., Urquhart, S. and van der Werf, P. 2020. IRAM 30m-EMIR redshift search of z = 3-4 lensed dusty starbursts selected from the HerBS sample. Monthly Notices of the Royal Astronomical Society 496 (2) , pp. 2372-2390. 10.1093/mnras/staa1664

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Using the EMIR instrument on the IRAM 30 m telescope, we conducted a spectroscopic redshift search of seven zphot ∼4 sub-millimetre bright galaxies selected from the Herschel Bright Sources (HerBS) sample with fluxes at 500 µm greater than 80 mJy. For four sources, we obtained spectroscopic redshifts between 3.4 < z < 4.1 through the detection of multiple CO-spectral lines with J ≥3. Later, we detected low-J transitions for two of these sources with the GBT including the CO(1-0) transition. For the remaining three sources, more data are needed to determine the spectroscopic redshift unambiguously. The measured CO luminosities and line widths suggest that all these sources are gravitationally lensed. These observations demonstrate that the 2 mm window is indispensable to confirm robust spectroscopic redshifts for z < 4 sources. Finally, we present an efficient graphical method to correctly identify spectroscopic redshifts.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 11 June 2020
Date of Acceptance: 8 June 2020
Last Modified: 24 Feb 2024 10:34

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