The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies
We analyse the velocity dispersion properties of 472 z~0.9 star-forming galaxies observed as part of the KMOS Redshift One Spectroscopic Survey (KROSS). The majority of this sample is rotationally dominated (83 +/- 5% with v_C/sigma_0 > 1) but also dynamically hot and highly turbulent. After...
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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2017
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| _version_ | 1826283322296238080 |
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| author | Johnson, HL Harrison, CM Swinbank, AM Tiley, AL Stott, JP Bower, RG Smail, I Bunker, AJ Sobral, D Turner, OJ Best, P Bureau, M Cirasuolo, M Jarvis, MJ Magdis, G Sharples, RM Bland-Hawthorn, J Catinella, B Cortese, L Croom, SM Federrath, C Glazebrook, K Sweet, SM Bryant, JJ Goodwin, M Konstantopoulos, IS Lawrence, JS Medling, AM Owers, MS Richards, S |
| author_facet | Johnson, HL Harrison, CM Swinbank, AM Tiley, AL Stott, JP Bower, RG Smail, I Bunker, AJ Sobral, D Turner, OJ Best, P Bureau, M Cirasuolo, M Jarvis, MJ Magdis, G Sharples, RM Bland-Hawthorn, J Catinella, B Cortese, L Croom, SM Federrath, C Glazebrook, K Sweet, SM Bryant, JJ Goodwin, M Konstantopoulos, IS Lawrence, JS Medling, AM Owers, MS Richards, S |
| author_sort | Johnson, HL |
| collection | OXFORD |
| description | We analyse the velocity dispersion properties of 472 z~0.9 star-forming galaxies observed as part of the KMOS Redshift One Spectroscopic Survey (KROSS). The majority of this sample is rotationally dominated (83 +/- 5% with v_C/sigma_0 > 1) but also dynamically hot and highly turbulent. After correcting for beam smearing effects, the median intrinsic velocity dispersion for the final sample is sigma_0 = 43.2 +/- 0.8 km/s with a rotational velocity to dispersion ratio of v_C/sigma_0 = 2.6 +/- 0.1. To explore the relationship between velocity dispersion, stellar mass, star formation rate and redshift we combine KROSS with data from the SAMI survey (z~0.05) and an intermediate redshift MUSE sample (z~0.5). While there is, at most, a weak trend between velocity dispersion and stellar mass, at fixed mass there is a strong increase with redshift. At all redshifts, galaxies appear to follow the same weak trend of increasing velocity dispersion with star formation rate. Our results are consistent with an evolution of galaxy dynamics driven by disks that are more gas rich, and increasingly gravitationally unstable, as a function of increasing redshift. Finally, we test two analytic models that predict turbulence is driven by either gravitational instabilities or stellar feedback. Both provide an adequate description of the data, and further observations are required to rule out either model. |
| first_indexed | 2024-03-07T00:57:10Z |
| format | Journal article |
| id | oxford-uuid:887918ee-a90a-4fea-a4a9-91a80326cddd |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:57:10Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | oxford-uuid:887918ee-a90a-4fea-a4a9-91a80326cddd2022-03-26T22:17:33ZThe KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:887918ee-a90a-4fea-a4a9-91a80326cdddSymplectic Elements at Oxford2017Johnson, HLHarrison, CMSwinbank, AMTiley, ALStott, JPBower, RGSmail, IBunker, AJSobral, DTurner, OJBest, PBureau, MCirasuolo, MJarvis, MJMagdis, GSharples, RMBland-Hawthorn, JCatinella, BCortese, LCroom, SMFederrath, CGlazebrook, KSweet, SMBryant, JJGoodwin, MKonstantopoulos, ISLawrence, JSMedling, AMOwers, MSRichards, SWe analyse the velocity dispersion properties of 472 z~0.9 star-forming galaxies observed as part of the KMOS Redshift One Spectroscopic Survey (KROSS). The majority of this sample is rotationally dominated (83 +/- 5% with v_C/sigma_0 > 1) but also dynamically hot and highly turbulent. After correcting for beam smearing effects, the median intrinsic velocity dispersion for the final sample is sigma_0 = 43.2 +/- 0.8 km/s with a rotational velocity to dispersion ratio of v_C/sigma_0 = 2.6 +/- 0.1. To explore the relationship between velocity dispersion, stellar mass, star formation rate and redshift we combine KROSS with data from the SAMI survey (z~0.05) and an intermediate redshift MUSE sample (z~0.5). While there is, at most, a weak trend between velocity dispersion and stellar mass, at fixed mass there is a strong increase with redshift. At all redshifts, galaxies appear to follow the same weak trend of increasing velocity dispersion with star formation rate. Our results are consistent with an evolution of galaxy dynamics driven by disks that are more gas rich, and increasingly gravitationally unstable, as a function of increasing redshift. Finally, we test two analytic models that predict turbulence is driven by either gravitational instabilities or stellar feedback. Both provide an adequate description of the data, and further observations are required to rule out either model. |
| spellingShingle | Johnson, HL Harrison, CM Swinbank, AM Tiley, AL Stott, JP Bower, RG Smail, I Bunker, AJ Sobral, D Turner, OJ Best, P Bureau, M Cirasuolo, M Jarvis, MJ Magdis, G Sharples, RM Bland-Hawthorn, J Catinella, B Cortese, L Croom, SM Federrath, C Glazebrook, K Sweet, SM Bryant, JJ Goodwin, M Konstantopoulos, IS Lawrence, JS Medling, AM Owers, MS Richards, S The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies |
| title | The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies |
| title_full | The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies |
| title_fullStr | The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies |
| title_full_unstemmed | The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies |
| title_short | The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies |
| title_sort | kmos redshift one spectroscopic survey kross the origin of disk turbulence in z 0 9 star forming galaxies |
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