Volume 621, January 2019
|Number of page(s)||11|
|Section||Letters to the Editor|
|Published online||08 January 2019|
Letter to the Editor
The angular momentum of disc galaxies at z = 1
Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
2 ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands
3 Research School of Astronomy and Astrophysics – The Australian National University, Canberra, ACT 2611, Australia
Accepted: 20 December 2018
We investigate the relation between stellar mass (M⋆) and specific stellar angular momentum (j⋆), or “Fall relation”, for a sample of 17 isolated, regularly rotating disc galaxies at z ∼ 1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determinations of their stellar masses. We use HST images in f814w and f160w filters, roughly corresponding to rest-frames B and I bands, to extract surface-brightness profiles for our systems. We robustly bracket j⋆ by assuming that rotation curves beyond the outermost Hα rotation point stay either flat or follow a Keplerian fall-off. By comparing our measurements with those determined for disc galaxies in the local universe, we find no evolution in the Fall relation in the redshift range 0 < z < 1, regardless of the band used and despite the uncertainties in the stellar rotation curves at large radii. This result holds unless stellar masses at z = 1 are systematically underestimated by ≳50%. Our findings are compatible with expectations based on a ΛCDM cosmological framework and support a scenario where both the stellar Tully–Fisher and mass-size relations for spirals do not evolve significantly in this redshift range.
Key words: galaxies: kinematics and dynamics / galaxies: evolution / galaxies: high-redshift / galaxies: photometry
© ESO 2019
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