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  • 1903.05148v1

    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 versionS Gillman, A M Swinbank, A L Tiley, C M Harrison, Ian Smail, U Dudzevičiūtė, R M Sharples, P N Best, R G Bower, R Cochrane, D Fisher, J E Geach, K Glazebrook, Edo Ibar, J Molina, D Obreschkow, M Schaller, D Sobral, S Sweet, J W Trayford, T Theuns, The dynamics and distribution of angular momentum in HiZELS star-forming galaxies at z = 0.8–3.3, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, June 2019, Pages 175–194, https://doi.org/10.1093/mnras/stz765 is available online at: https://academic.oup.com/mnras/article/486/1/175/5381563

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The dynamics and distribution of angular momentum in HiZELS star-forming galaxies at z = 0.8–3.3

Research output: Contribution to journalJournal article

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  • S. Gillman
  • A. M. Swinbank
  • A. L. Tiley
  • C. M. Harrison
  • Ian Smail
  • U. Dudzevičiūtė
  • R. M. Sharples
  • P. N. Best
  • R. G. Bower
  • R. Cochrane
  • D. Fisher
  • J. E. Geach
  • K. Glazebrook
  • Edo Ibar
  • J. Molina
  • D. Obreschkow
  • M. Schaller
  • S. Sweet
  • J. W. Trayford
  • T. Theuns
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<mark>Journal publication date</mark>1/06/2019
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number1
Volume486
Number of pages20
Pages (from-to)175-194
Publication statusPublished
Early online date15/03/19
Original languageEnglish

Abstract

We present adaptive optics assisted integral field spectroscopy of 34 star-forming galaxies at $z$ = 0.8-3.3 selected from the HiZELS narrow-band survey. We measure the kinematics of the ionised interstellar medium on $\sim$1 kpc scales, and show that the galaxies are turbulent, with a median ratio of rotational to dispersion support of $v$/$\sigma$=0.82$\pm$0.13. We combine the dynamics with high-resolution rest-frame optical imaging and extract emission line rotation curves. We show that high-redshift star forming galaxies follow a similar power-law trend in specific angular momentum with stellar mass as that of local late type galaxies. We exploit the high resolution of our data and examine the radial distribution of angular momentum within each galaxy by constructing total angular momentum profiles. Although the stellar mass of a typical star-forming galaxy is expected to grow by a factor $\sim$8 in the $\sim$5 Gyrs between $z$$\sim$3.3 and $z$$\sim$0.8, we show that the internal distribution of angular momentum becomes less centrally concentrated in this period i.e the angular momentum grows outwards. To interpret our observations, we exploit the EAGLE simulation and trace the angular momentum evolution of star forming galaxies from $z$$\sim$3 to $z$$\sim$0, identifying a similar trend of decreasing angular momentum concentration. This change is attributed to a combination of gas accretion in the outer disk, and feedback that preferentially arises from the central regions of the galaxy. We discuss how the combination of the growing bulge and angular momentum stabilises the disk and gives rise to the Hubble sequence.

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 versionS Gillman, A M Swinbank, A L Tiley, C M Harrison, Ian Smail, U Dudzevičiūtė, R M Sharples, P N Best, R G Bower, R Cochrane, D Fisher, J E Geach, K Glazebrook, Edo Ibar, J Molina, D Obreschkow, M Schaller, D Sobral, S Sweet, J W Trayford, T Theuns, The dynamics and distribution of angular momentum in HiZELS star-forming galaxies at z = 0.8–3.3, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, June 2019, Pages 175–194, https://doi.org/10.1093/mnras/stz765 is available online at: https://academic.oup.com/mnras/article/486/1/175/5381563