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 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: https://academic.oup.com/mnras/article/2972999/The
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - The KMOS Redshift One Spectroscopic Survey (KROSS)
T2 - rotational velocities and angular momentum of z~0.9 galaxies
AU - Harrison, C. M.
AU - Johnson, H. L.
AU - Swinbank, A. M.
AU - Stott, J. P.
AU - Bower, R. G.
AU - Smail, Ian
AU - Tiley, A. L.
AU - Bunker, A. J.
AU - Cirasuolo, M.
AU - Sobral, D.
AU - Sharples, R. M.
AU - Best, P.
AU - Bureau, M.
AU - Jarvis, M. J.
AU - Magdis, G.
N1 - 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: https://academic.oup.com/mnras/article/2972999/The Re-submitted to MNRAS after addressing referee's comments. Table of values and extended figures available at: http://astro.dur.ac.uk/KROSS/
PY - 2017/5/1
Y1 - 2017/5/1
N2 - 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.
AB - 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.
KW - astro-ph.GA
KW - astro-ph.CO
KW - galaxies: evolution
KW - galaxies: kinematics and dynamics
U2 - 10.1093/mnras/stx217
DO - 10.1093/mnras/stx217
M3 - Journal article
VL - 467
SP - 1965
EP - 1983
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -