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First [NII] 122 μm line detection in a starburst pair at z = 4.7

Published online by Cambridge University Press:  10 June 2020

Minju M. Lee Open the ORCID record for Minju M. Lee [Opens in a new window] ,
Tohru Nagao  and
Carlos De Breuck
Minju M. Lee
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik (MPE), Giessenbachstr., D-85748 Garching, Germnay Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464-8602, Japan National Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo181-0015, Japan email: minju@mpe.mpg.de
Tohru Nagao
Affiliation:
Graduate School of Science and Engineering, Ehime University, 2-5 Bunkyo-cho, Matsuyama790-8577, Japan
Carlos De Breuck
Affiliation:
European Southern Observatory, Karl Schwarzschild Straß e 2, 85748Garching, Germany
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Abstract

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We report the first detection of [NII] 122 μm line toward a QSO-SMG pair, BRI 1202-0725, at z = 4.7 using ALMA. Combining with [NII] 205 μm line detection and taking the line ratio of [NII]122/[NII]205, we constrain electron densities of both galaxies. The derived electron densities are ${26_{ - 11}^{ + 12}$ and ${134_{ - 39}^{ + 50}$ cm−3 for the SMG and the QSO, respectively, which are the first measurements for galaxies at z > 4. The electron density of the SMG is comparable to the Galactic plane and the average of local spiral galaxies, while the value for the QSO is comparable to local starbursts and optical-line based measurements for star-forming galaxies at z ∼ 2–3. Considering the similar star-formation rates (SFRs) of ≍ 1000 M⊙ yr−1 for both galaxies, our results suggest a large scatter of electron densities at fixed SFR and caution against using optical lines for dusty starbursts. The details of this report are presented in Lee et al. 2019 (submitted).

Keywords

galaxies: evolutiongalaxies: high-redshiftgalaxies: ISMgalaxies: starburstsubmillimeterISM: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 283 - 284
Copyright
© International Astronomical Union 2020

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