The KMOS Redshift One Spectroscopic Survey (KROSS):rotational velocities and angular momentum of z~0.9 galaxies

Harrison, C. M. and Johnson, H. L. and Swinbank, A. M. and Stott, J. P. and Bower, R. G. and Smail, Ian and Tiley, A. L. and Bunker, A. J. and Cirasuolo, M. and Sobral, D. and Sharples, R. M. and Best, P. and Bureau, M. and Jarvis, M. J. and Magdis, G. (2017) The KMOS Redshift One Spectroscopic Survey (KROSS):rotational velocities and angular momentum of z~0.9 galaxies. Monthly Notices of the Royal Astronomical Society, 467 (2). pp. 1965-1983. ISSN 0035-8711

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We present dynamical measurements for 586 H-alpha detected star-forming galaxies from the KMOS (K-band Multi-Object Spectrograph) Redshift One Spectroscopic Survey (KROSS). The sample represents typical star-forming galaxies at this redshift (z=0.6-1.0), with a median star formation rate of ~7 Msol/yr and a stellar mass range of log[M/Msol]~9-11. We find that the rotation velocity-stellar mass relationship (the inverse of the Tully-Fisher relationship) for our rotationally-dominated sources (v/sigma>1) has a consistent slope and normalisation as that observed for z=0 disks. In contrast, the specific angular momentum (j; angular momentum divided by stellar mass), is ~0.2-0.3 dex lower on average compared to z=0 disks. The specific angular momentum scales as M^[0.6+/-0.2], consistent with that expected for dark matter (i.e., proportional to M^[2/3]). We find that z~0.9 star-forming galaxies have decreasing specific angular momentum with increasing Sersic index. Visually, the sources with the highest specific angular momentum, for a given mass, have the most disk-dominated morphologies. This implies that an angular momentum-mass-morphology relationship, similar to that observed in local massive galaxies, is already in place by z~1.

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Journal Article
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Monthly Notices of the Royal Astronomical Society
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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 C. M. Harrison, H. L. Johnson, A. M. Swinbank, J. P. Stott, R. G. Bower, Ian Smail, A. L. Tiley, A. J. Bunker, M. Cirasuolo, D. Sobral, R. M. Sharples, P. Best, M. Bureau, M. J. Jarvis, G. Magdis; The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies. Mon Not R Astron Soc 2017; 467 (2): 1965-1983. doi: 10.1093/mnras/stx217 is available online at: Re-submitted to MNRAS after addressing referee's comments. Table of values and extended figures available at:
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23 Jan 2017 12:12
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20 Sep 2023 00:59