The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies
We use the complete Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to determine the contribution of slow rotators (SRs), as well as different types of fast rotators (FRs), to the stellar mass function of galaxies in the local Universe. We use stellar kinematics not only to...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2019
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Online Access: | http://hdl.handle.net/1959.3/454139 https://doi.org/10.1093/mnras/stz3042 |
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ftswinburne:tle:d5d15727-d1f6-4308-83fc-af1095bd95b7:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-05-15T18:11:39+02:00 The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies Guo, Kexin Cortese, Luca Obreschkow, Danail Catinella, Barbara van de Sande, Jesse Croom, Scott M Brough, Sarah Sweet, Sarah Bryant, Julia J Medling, Anne Bland-Hawthorn, Joss Owers, Matt Richards, Samuel N Swinburne University of Technology 2019 http://hdl.handle.net/1959.3/454139 https://doi.org/10.1093/mnras/stz3042 unknown Oxford University Press (OUP) http://hdl.handle.net/1959.3/454139 https://doi.org/10.1093/mnras/stz3042 Copyright © 2019 Monthly Notices of the Royal Astronomical Society, Vol. 491, no. 1 (Oct 2019), pp. 773-781 Journal article 2019 ftswinburne https://doi.org/10.1093/mnras/stz3042 2020-02-24T23:25:04Z We use the complete Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to determine the contribution of slow rotators (SRs), as well as different types of fast rotators (FRs), to the stellar mass function of galaxies in the local Universe. We use stellar kinematics not only to discriminate between fast and SRs, but also to distinguish between dynamically cold systems (i.e. consistent with intrinsic axis ratios<0.3) and systems including a prominent dispersion-supported bulge. We show that FRs account for more than 80 per cent of the stellar mass budget of nearby galaxies, confirming that their number density overwhelms that of SRs at almost all masses from 10(9) to 10(11.5)M(circle dot). Most importantly, dynamically cold discs contribute to at least 25 per cent of the stellar mass budget of the local Universe, significantly higher than what is estimated from visual morphology alone. For stellar masses up to 10(10.5)M(circle dot), this class makes up >= 30 per cent of the galaxy population in each stellar mass bin. The fact that many galaxies that are visually classified as having two-components have stellar spin consistent with dynamically cold discs suggests that the inner component is either rotationally dominated (e.g. bar, pseudo-bulge) or has little effect on the global stellar kinematics of galaxies. Article in Journal/Newspaper sami Swinburne University of Technology: Swinburne Research Bank Monthly Notices of the Royal Astronomical Society |
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Swinburne University of Technology: Swinburne Research Bank |
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description |
We use the complete Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to determine the contribution of slow rotators (SRs), as well as different types of fast rotators (FRs), to the stellar mass function of galaxies in the local Universe. We use stellar kinematics not only to discriminate between fast and SRs, but also to distinguish between dynamically cold systems (i.e. consistent with intrinsic axis ratios<0.3) and systems including a prominent dispersion-supported bulge. We show that FRs account for more than 80 per cent of the stellar mass budget of nearby galaxies, confirming that their number density overwhelms that of SRs at almost all masses from 10(9) to 10(11.5)M(circle dot). Most importantly, dynamically cold discs contribute to at least 25 per cent of the stellar mass budget of the local Universe, significantly higher than what is estimated from visual morphology alone. For stellar masses up to 10(10.5)M(circle dot), this class makes up >= 30 per cent of the galaxy population in each stellar mass bin. The fact that many galaxies that are visually classified as having two-components have stellar spin consistent with dynamically cold discs suggests that the inner component is either rotationally dominated (e.g. bar, pseudo-bulge) or has little effect on the global stellar kinematics of galaxies. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Guo, Kexin Cortese, Luca Obreschkow, Danail Catinella, Barbara van de Sande, Jesse Croom, Scott M Brough, Sarah Sweet, Sarah Bryant, Julia J Medling, Anne Bland-Hawthorn, Joss Owers, Matt Richards, Samuel N |
spellingShingle |
Guo, Kexin Cortese, Luca Obreschkow, Danail Catinella, Barbara van de Sande, Jesse Croom, Scott M Brough, Sarah Sweet, Sarah Bryant, Julia J Medling, Anne Bland-Hawthorn, Joss Owers, Matt Richards, Samuel N The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies |
author_facet |
Guo, Kexin Cortese, Luca Obreschkow, Danail Catinella, Barbara van de Sande, Jesse Croom, Scott M Brough, Sarah Sweet, Sarah Bryant, Julia J Medling, Anne Bland-Hawthorn, Joss Owers, Matt Richards, Samuel N |
author_sort |
Guo, Kexin |
title |
The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies |
title_short |
The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies |
title_full |
The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies |
title_fullStr |
The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies |
title_sort |
sami galaxy survey: the contribution of different kinematic classes to the stellar mass function of nearby galaxies |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://hdl.handle.net/1959.3/454139 https://doi.org/10.1093/mnras/stz3042 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, Vol. 491, no. 1 (Oct 2019), pp. 773-781 |
op_relation |
http://hdl.handle.net/1959.3/454139 https://doi.org/10.1093/mnras/stz3042 |
op_rights |
Copyright © 2019 |
op_doi |
https://doi.org/10.1093/mnras/stz3042 |
container_title |
Monthly Notices of the Royal Astronomical Society |
_version_ |
1766184297857810432 |