Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation
<p>We present the evolution of the star formation dispersion–stellar mass relation (σ<sub>SFR</sub>–<em>M</em><sub>⋆</sub>) in the DEVILS D10 region using new measurements derived using the PROSPECT spectral en...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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Oxford University Press
2021
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| _version_ | 1797107589617549312 |
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| author | Davies, LJM Thorne, JE Bellstedt, S Bravo, M Robotham, ASG Driver, SP Cook, RHW Cortese, L D'Silva, J Grootes, MW Holwerda, BW Hopkins, AM Jarvis, MJ Lidman, C Phillipps, S Siudek, M |
| author_facet | Davies, LJM Thorne, JE Bellstedt, S Bravo, M Robotham, ASG Driver, SP Cook, RHW Cortese, L D'Silva, J Grootes, MW Holwerda, BW Hopkins, AM Jarvis, MJ Lidman, C Phillipps, S Siudek, M |
| author_sort | Davies, LJM |
| collection | OXFORD |
| description | <p>We present the evolution of the star formation dispersion–stellar mass relation (σ<sub>SFR</sub>–<em>M</em><sub>⋆</sub>) in the DEVILS D10 region using new measurements derived using the PROSPECT spectral energy distribution fitting code. We find that σ<sub>SFR</sub>–<em>M</em><sub>⋆</sub> shows the characteristic ‘U-shape’ at intermediate stellar masses from 0.1 < <em>z</em> < 0.7 for a number of metrics, including using the deconvolved intrinsic dispersion. A physical interpretation of this relation is the combination of stochastic star formation and stellar feedback causing large scatter at low stellar masses and AGN feedback causing asymmetric scatter at high stellar masses. As such, the shape of this distribution and its evolution encodes detailed information about the astrophysical processes affecting star formation, feedback and the lifecycle of galaxies. We find that the stellar mass that the minimum σ<sub>SFR</sub> occurs evolves linearly with redshift, moving to higher stellar masses with increasing lookback time and traces the turnover in the star-forming sequence. This minimum σ<sub>SFR</sub> point is also found to occur at a fixed specific star formation rate (sSFR) at all epochs (sSFR ∼ 10<sup>−9.6</sup> Gyr<sup>−1</sup>). The physical interpretation of this is that there exists a maximum sSFR at which galaxies can internally self-regulate on the tight sequence of star formation. At higher sSFRs, stochastic stellar processes begin to cause galaxies to be pushed both above and below the star-forming sequence leading to increased SFR dispersion. As the Universe evolves, a higher fraction of galaxies will drop below this sSFR threshold, causing the dispersion of the low stellar mass end of the star-forming sequence to decrease with time.</p> |
| first_indexed | 2024-03-07T07:18:09Z |
| format | Journal article |
| id | oxford-uuid:41aeb640-1632-41f0-84ad-2da1c781b3f1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:18:09Z |
| publishDate | 2021 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:41aeb640-1632-41f0-84ad-2da1c781b3f12022-09-07T06:33:52ZDeep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:41aeb640-1632-41f0-84ad-2da1c781b3f1EnglishSymplectic ElementsOxford University Press2021Davies, LJMThorne, JEBellstedt, SBravo, MRobotham, ASGDriver, SPCook, RHWCortese, LD'Silva, JGrootes, MWHolwerda, BWHopkins, AMJarvis, MJLidman, CPhillipps, SSiudek, M<p>We present the evolution of the star formation dispersion–stellar mass relation (σ<sub>SFR</sub>–<em>M</em><sub>⋆</sub>) in the DEVILS D10 region using new measurements derived using the PROSPECT spectral energy distribution fitting code. We find that σ<sub>SFR</sub>–<em>M</em><sub>⋆</sub> shows the characteristic ‘U-shape’ at intermediate stellar masses from 0.1 < <em>z</em> < 0.7 for a number of metrics, including using the deconvolved intrinsic dispersion. A physical interpretation of this relation is the combination of stochastic star formation and stellar feedback causing large scatter at low stellar masses and AGN feedback causing asymmetric scatter at high stellar masses. As such, the shape of this distribution and its evolution encodes detailed information about the astrophysical processes affecting star formation, feedback and the lifecycle of galaxies. We find that the stellar mass that the minimum σ<sub>SFR</sub> occurs evolves linearly with redshift, moving to higher stellar masses with increasing lookback time and traces the turnover in the star-forming sequence. This minimum σ<sub>SFR</sub> point is also found to occur at a fixed specific star formation rate (sSFR) at all epochs (sSFR ∼ 10<sup>−9.6</sup> Gyr<sup>−1</sup>). The physical interpretation of this is that there exists a maximum sSFR at which galaxies can internally self-regulate on the tight sequence of star formation. At higher sSFRs, stochastic stellar processes begin to cause galaxies to be pushed both above and below the star-forming sequence leading to increased SFR dispersion. As the Universe evolves, a higher fraction of galaxies will drop below this sSFR threshold, causing the dispersion of the low stellar mass end of the star-forming sequence to decrease with time.</p> |
| spellingShingle | Davies, LJM Thorne, JE Bellstedt, S Bravo, M Robotham, ASG Driver, SP Cook, RHW Cortese, L D'Silva, J Grootes, MW Holwerda, BW Hopkins, AM Jarvis, MJ Lidman, C Phillipps, S Siudek, M Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation |
| title | Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation |
| title_full | Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation |
| title_fullStr | Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation |
| title_full_unstemmed | Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation |
| title_short | Deep Extragalactic VIsible Legacy Survey (DEVILS): evolution of the σSFR–M⋆ relation and implications for self-regulated star formation |
| title_sort | deep extragalactic visible legacy survey devils evolution of the σsfr m⋆ relation and implications for self regulated star formation |
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