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    Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Cheng Cheng, Edo Ibar, Ian Smail, Juan Molina, David Sobral, Andrés Escala, Philip Best, Rachel Cochrane, Steven Gillman, Mark Swinbank, R J Ivison, Jia-Sheng Huang, Thomas M Hughes, Eric Villard, Michele Cirasuolo, A kpc-scale-resolved study of unobscured and obscured star formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS, Monthly Notices of the Royal Astronomical Society, Volume 499, Issue 4, December 2020, Pages 5241–5256 is available online at: https://academic.oup.com/mnras/article-abstract/499/4/5241/5917428

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A kpc-scale resolved study of unobscured and obscured star-formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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  • Cheng Cheng
  • Edo Ibar
  • Ian Smail
  • Juan Molina
  • David Sobral
  • Andrés Escala
  • Philip Best
  • Rachel Cochrane
  • Steven Gillman
  • Mark Swinbank
  • R. J. Ivison
  • Jia-Sheng Huang
  • Thomas M. Hughes
  • Eric Villard
  • Michele Cirasuolo
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<mark>Journal publication date</mark>1/12/2020
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number4
Volume499
Number of pages16
Pages (from-to)5241–5256
Publication StatusPublished
Early online date2/10/20
<mark>Original language</mark>English

Abstract

We present Atacama Large Millimeter/Submillimeter Array (ALMA) continuum observations of a sample of nine star-forming galaxies at redshifts 1.47 and 2.23 selected from the High-z Emission Line Survey (HiZELS). Four galaxies in our sample are detected at high significance by ALMA at a resolution of 0′′.25 at rest-frame 355 μm. Together with the previously observed H α emission, from adaptive optics-assisted integral-field-unit spectroscopy (∼0′′.15 resolution), and F606W and F140W imaging from the Hubble Space Telescope (∼0′′.2 resolution), we study the star formation activity, stellar and dust mass in these high-redshift galaxies at ∼kpc-scale resolution. We find that ALMA detection rates are higher for more massive galaxies (M* > 1010.5 M⊙) and higher [N II]/H α ratios (>0.25, a proxy for gas-phase metallicity). The dust extends out to a radius of 8 kpc, with a smooth structure, even for those galaxies presenting clumpy H α morphologies. The half-light radii (Rdust) derived for the detected galaxies are of the order ∼4.5 kpc, more than twice the size of submillimetre-selected galaxies at a similar redshift. Our global star formation rate estimates – from far-infrared and extinction-corrected H α luminosities – are in good agreement. However, the different morphologies of the different phases of the interstellar medium suggest complex extinction properties of the high-redshift normal galaxies.

Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Cheng Cheng, Edo Ibar, Ian Smail, Juan Molina, David Sobral, Andrés Escala, Philip Best, Rachel Cochrane, Steven Gillman, Mark Swinbank, R J Ivison, Jia-Sheng Huang, Thomas M Hughes, Eric Villard, Michele Cirasuolo, A kpc-scale-resolved study of unobscured and obscured star formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS, Monthly Notices of the Royal Astronomical Society, Volume 499, Issue 4, December 2020, Pages 5241–5256 is available online at: https://academic.oup.com/mnras/article-abstract/499/4/5241/5917428

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