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  • 1601.03400v1

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  • MNRAS-2016-Stott-1888-904

    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies

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

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The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies. / Stott, John; Swinbank, A. M.; Johnson, Helen L. et al.
In: Monthly Notices of the Royal Astronomical Society, Vol. 457, No. 2, 01.04.2016, p. 1888-1904.

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

Harvard

Stott, J, Swinbank, AM, Johnson, HL, Tiley, A, Magdis, G, Bower, R, Bunker, AJ, Bureau, M, Harrison, CM, Jarvis, MJ, Sharples, R, Smail, I, Sobral, D, Best, P & Cirasuolo, M 2016, 'The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies', Monthly Notices of the Royal Astronomical Society, vol. 457, no. 2, pp. 1888-1904. https://doi.org/10.1093/mnras/stw129

APA

Stott, J., Swinbank, A. M., Johnson, H. L., Tiley, A., Magdis, G., Bower, R., Bunker, A. J., Bureau, M., Harrison, C. M., Jarvis, M. J., Sharples, R., Smail, I., Sobral, D., Best, P., & Cirasuolo, M. (2016). The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 457(2), 1888-1904. https://doi.org/10.1093/mnras/stw129

Vancouver

Stott J, Swinbank AM, Johnson HL, Tiley A, Magdis G, Bower R et al. The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies. Monthly Notices of the Royal Astronomical Society. 2016 Apr 1;457(2):1888-1904. Epub 2016 Feb 4. doi: 10.1093/mnras/stw129

Author

Stott, John ; Swinbank, A. M. ; Johnson, Helen L. et al. / The KMOS Redshift One Spectroscopic Survey (KROSS) : dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 457, No. 2. pp. 1888-1904.

Bibtex

@article{29c97b3b243b4639bc59186b392e3cc9,
title = "The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies",
abstract = "The KMOS Redshift One Spectroscopic Survey (KROSS) is an ESO guaranteed time survey of 795 typical star-forming galaxies in the redshift range z=0.8-1.0 with the KMOS instrument on the VLT. In this paper we present resolved kinematics and star formation rates for 584 z~1 galaxies. This constitutes the largest near-infrared Integral Field Unit survey of galaxies at z~1 to date. We demonstrate the success of our selection criteria with 90% of our targets found to be Halpha emitters, of which 81% are spatially resolved. The fraction of the resolved KROSS sample with dynamics dominated by ordered rotation is found to be 83$\pm$5%. However, when compared with local samples these are turbulent discs with high gas to baryonic mass fractions, ~35%, and the majority are consistent with being marginally unstable (Toomre Q~1). There is no strong correlation between galaxy averaged velocity dispersion and the total star formation rate, suggesting that feedback from star formation is not the origin of the elevated turbulence. We postulate that it is the ubiquity of high (likely molecular) gas fractions and the associated gravitational instabilities that drive the elevated star-formation rates in these typical z~1 galaxies, leading to the ten-fold enhanced star-formation rate density. Finally, by comparing the gas masses obtained from inverting the star-formation law with the dynamical and stellar masses, we infer an average dark matter to total mass fraction within 2.2$r_e$ (9.5kpc) of 65$\pm$12%, in agreement with the results from hydrodynamic simulations of galaxy formation.",
keywords = "astro-ph.GA",
author = "John Stott and Swinbank, {A. M.} and Johnson, {Helen L.} and Alfie Tiley and Georgios Magdis and Richard Bower and Bunker, {Andrew J.} and Martin Bureau and Harrison, {Chris M.} and Jarvis, {Matt J.} and Ray Sharples and Ian Smail and David Sobral and Philip Best and Michele Cirasuolo",
note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society {\textcopyright}: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",
year = "2016",
month = apr,
day = "1",
doi = "10.1093/mnras/stw129",
language = "English",
volume = "457",
pages = "1888--1904",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "2",

}

RIS

TY - JOUR

T1 - The KMOS Redshift One Spectroscopic Survey (KROSS)

T2 - dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies

AU - Stott, John

AU - Swinbank, A. M.

AU - Johnson, Helen L.

AU - Tiley, Alfie

AU - Magdis, Georgios

AU - Bower, Richard

AU - Bunker, Andrew J.

AU - Bureau, Martin

AU - Harrison, Chris M.

AU - Jarvis, Matt J.

AU - Sharples, Ray

AU - Smail, Ian

AU - Sobral, David

AU - Best, Philip

AU - Cirasuolo, Michele

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - The KMOS Redshift One Spectroscopic Survey (KROSS) is an ESO guaranteed time survey of 795 typical star-forming galaxies in the redshift range z=0.8-1.0 with the KMOS instrument on the VLT. In this paper we present resolved kinematics and star formation rates for 584 z~1 galaxies. This constitutes the largest near-infrared Integral Field Unit survey of galaxies at z~1 to date. We demonstrate the success of our selection criteria with 90% of our targets found to be Halpha emitters, of which 81% are spatially resolved. The fraction of the resolved KROSS sample with dynamics dominated by ordered rotation is found to be 83$\pm$5%. However, when compared with local samples these are turbulent discs with high gas to baryonic mass fractions, ~35%, and the majority are consistent with being marginally unstable (Toomre Q~1). There is no strong correlation between galaxy averaged velocity dispersion and the total star formation rate, suggesting that feedback from star formation is not the origin of the elevated turbulence. We postulate that it is the ubiquity of high (likely molecular) gas fractions and the associated gravitational instabilities that drive the elevated star-formation rates in these typical z~1 galaxies, leading to the ten-fold enhanced star-formation rate density. Finally, by comparing the gas masses obtained from inverting the star-formation law with the dynamical and stellar masses, we infer an average dark matter to total mass fraction within 2.2$r_e$ (9.5kpc) of 65$\pm$12%, in agreement with the results from hydrodynamic simulations of galaxy formation.

AB - The KMOS Redshift One Spectroscopic Survey (KROSS) is an ESO guaranteed time survey of 795 typical star-forming galaxies in the redshift range z=0.8-1.0 with the KMOS instrument on the VLT. In this paper we present resolved kinematics and star formation rates for 584 z~1 galaxies. This constitutes the largest near-infrared Integral Field Unit survey of galaxies at z~1 to date. We demonstrate the success of our selection criteria with 90% of our targets found to be Halpha emitters, of which 81% are spatially resolved. The fraction of the resolved KROSS sample with dynamics dominated by ordered rotation is found to be 83$\pm$5%. However, when compared with local samples these are turbulent discs with high gas to baryonic mass fractions, ~35%, and the majority are consistent with being marginally unstable (Toomre Q~1). There is no strong correlation between galaxy averaged velocity dispersion and the total star formation rate, suggesting that feedback from star formation is not the origin of the elevated turbulence. We postulate that it is the ubiquity of high (likely molecular) gas fractions and the associated gravitational instabilities that drive the elevated star-formation rates in these typical z~1 galaxies, leading to the ten-fold enhanced star-formation rate density. Finally, by comparing the gas masses obtained from inverting the star-formation law with the dynamical and stellar masses, we infer an average dark matter to total mass fraction within 2.2$r_e$ (9.5kpc) of 65$\pm$12%, in agreement with the results from hydrodynamic simulations of galaxy formation.

KW - astro-ph.GA

U2 - 10.1093/mnras/stw129

DO - 10.1093/mnras/stw129

M3 - Journal article

VL - 457

SP - 1888

EP - 1904

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -