The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★
We present dynamical measurements for 586 Hα-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 M ⊙ yr...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal article |
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Oxford University Press
2017
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| _version_ | 1826276642703540224 |
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| author | Harrison, C Johnson, H Swinbank, A Stott, J Bower, R Smail, I Tiley, A Bunker, A Cirasuolo, M Sobral, D Sharples, R Best, P Bureau, M Jarvis, M Magdis, G |
| author_facet | Harrison, C Johnson, H Swinbank, A Stott, J Bower, R Smail, I Tiley, A Bunker, A Cirasuolo, M Sobral, D Sharples, R Best, P Bureau, M Jarvis, M Magdis, G |
| author_sort | Harrison, C |
| collection | OXFORD |
| description | We present dynamical measurements for 586 Hα-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 M ⊙ yr -1 and a stellar mass range of log (M * [M ⊙ ]) ≈ 9-11. We find that the rotation velocity-stellar mass relationship (the inverse of the Tully- Fisher relationship) for our rotationally dominated sources (v C /σ 0 > 1) has a consistent slope and normalization as that observed for z = 0 discs. 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 discs. The specific angular momentum scales as j s ∝ M * 0.6±0.2 , consistent with that expected for dark matter (i.e. j DM ∝ M DM 2/3 ). We find that z≈ 0.9 star-forming galaxies have decreasing specific angular momentum with increasing Sérsic index. Visually, the sources with the highest specific angular momentum, for a given mass, have the most disc-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. |
| first_indexed | 2024-03-06T23:17:01Z |
| format | Journal article |
| id | oxford-uuid:6779b0c8-7634-4f98-a470-825193a7177a |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:17:01Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:6779b0c8-7634-4f98-a470-825193a7177a2022-03-26T18:38:37ZThe KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6779b0c8-7634-4f98-a470-825193a7177aSymplectic Elements at OxfordOxford University Press2017Harrison, CJohnson, HSwinbank, AStott, JBower, RSmail, ITiley, ABunker, ACirasuolo, MSobral, DSharples, RBest, PBureau, MJarvis, MMagdis, GWe present dynamical measurements for 586 Hα-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 M ⊙ yr -1 and a stellar mass range of log (M * [M ⊙ ]) ≈ 9-11. We find that the rotation velocity-stellar mass relationship (the inverse of the Tully- Fisher relationship) for our rotationally dominated sources (v C /σ 0 > 1) has a consistent slope and normalization as that observed for z = 0 discs. 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 discs. The specific angular momentum scales as j s ∝ M * 0.6±0.2 , consistent with that expected for dark matter (i.e. j DM ∝ M DM 2/3 ). We find that z≈ 0.9 star-forming galaxies have decreasing specific angular momentum with increasing Sérsic index. Visually, the sources with the highest specific angular momentum, for a given mass, have the most disc-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. |
| spellingShingle | Harrison, C Johnson, H Swinbank, A Stott, J Bower, R Smail, I Tiley, A Bunker, A Cirasuolo, M Sobral, D Sharples, R Best, P Bureau, M Jarvis, M Magdis, G The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★ |
| title | The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★ |
| title_full | The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★ |
| title_fullStr | The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★ |
| title_full_unstemmed | The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★ |
| title_short | The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies★ |
| title_sort | kmos redshift one spectroscopic survey kross rotational velocities and angular momentum of z ≈ 0 9 galaxies★ |
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