Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation
<p>In this thesis we use the Tully-Fisher relation (TFR), the correlation between a galaxy's luminosity and its rotation velocity, to probe the luminous and dark matter in galaxies over the last ≈ 8 Gyr. First, we use samples of galaxies spatially resolved in Hα emission with integral fie...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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2016
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| _version_ | 1817931958826565632 |
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| author | Tiley, A |
| author2 | Bureau, M |
| author_facet | Bureau, M Tiley, A |
| author_sort | Tiley, A |
| collection | OXFORD |
| description | <p>In this thesis we use the Tully-Fisher relation (TFR), the correlation between a galaxy's luminosity and its rotation velocity, to probe the luminous and dark matter in galaxies over the last ≈ 8 Gyr. First, we use samples of galaxies spatially resolved in Hα emission with integral field unit observations from the K-band Multi-Object Spectrograph (KMOS) Redshift One Spectroscopic Survey (KROSS) at <em>z</em> ≈ 1 and the Sydney-Australian-Astronomical-Observatory Multi- object Integral-Field Spectrograph (SAMI) Galaxy Survey at <em>z</em> ≈ 0. We match the data quality, analysis methods and sample selection between the two surveys to conduct a direct comparison of the absolute K-band magnitude (MK) and stellar mass (<em>M</em><sub>*</sub>) TFRs at <em>z</em> ≈ 1 and <em>z</em> ≈ 0, free of any difference in biases between them. We measure no evolution of the MK TFR zero-point for star- forming disk-like galaxies since <em>z</em> ≈ 1, but an increase by 0.2 ± 0.2 dex of the <em>M</em><sub>*</sub> TFR zero-point for the same galaxies over the same period. This implies the total mass-to-stellar mass ratio of those galaxies has decreased by a factor of ≈ 0.4 since <em>z</em> ≈ 1 at fixed rotation velocity, whilst their K-band stellar mass-to- light ratio has increased by a factor of ≈ 1.6. Moderate rates of star formation in galaxies and continued gas accretion since <em>z</em> ≈ 1 can explain these changes. Second, we take a step toward an independent measure of the TFR evolution over the same period using carbon monoxide (CO) emission from galaxies as an alternative kinematic tracer. We present the <em>M</em><sub>*</sub> and <em>Wide-Field Infrared Survey Explorer</em> absolute Band 1 magnitude (MW1) TFRs for galaxies from the CO Legacy Database for the <em>Galex</em> Arecibo SDSS Survey (COLD GASS) as <em>z</em> ≈ 0 benchmarks that are pre-requisites to extend the CO TFR to <em>z</em> &gsim; 1. We find no significant offsets between the COLD GASS TFR zero-points and those of similar <em>z</em> ≈ 0 studies. The slope of the <em>M</em><sub>*</sub> COLD GASS TFR agrees with those of similar <em>z</em> ≈ 0 studies, but the MW1 TFR slope is slightly shallower than previous studies at a similar redshift. We attribute this to the fact that the COLD GASS sample comprises galaxies of various (late-type) morphologies. Nevertheless, our work provides a robust reference point with which to compare future CO TFR studies.</p> |
| first_indexed | 2024-03-06T18:54:41Z |
| format | Thesis |
| id | oxford-uuid:1169c5e2-5962-47a4-8c9f-f58fcf93bf68 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:30:18Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | oxford-uuid:1169c5e2-5962-47a4-8c9f-f58fcf93bf682024-12-01T13:39:17ZProbing the evolution of galaxies since z ~ 1 with the Tully-Fisher relationThesishttp://purl.org/coar/resource_type/c_db06uuid:1169c5e2-5962-47a4-8c9f-f58fcf93bf68AstronomyEnglishORA Deposit2016Tiley, ABureau, M<p>In this thesis we use the Tully-Fisher relation (TFR), the correlation between a galaxy's luminosity and its rotation velocity, to probe the luminous and dark matter in galaxies over the last ≈ 8 Gyr. First, we use samples of galaxies spatially resolved in Hα emission with integral field unit observations from the K-band Multi-Object Spectrograph (KMOS) Redshift One Spectroscopic Survey (KROSS) at <em>z</em> ≈ 1 and the Sydney-Australian-Astronomical-Observatory Multi- object Integral-Field Spectrograph (SAMI) Galaxy Survey at <em>z</em> ≈ 0. We match the data quality, analysis methods and sample selection between the two surveys to conduct a direct comparison of the absolute K-band magnitude (MK) and stellar mass (<em>M</em><sub>*</sub>) TFRs at <em>z</em> ≈ 1 and <em>z</em> ≈ 0, free of any difference in biases between them. We measure no evolution of the MK TFR zero-point for star- forming disk-like galaxies since <em>z</em> ≈ 1, but an increase by 0.2 ± 0.2 dex of the <em>M</em><sub>*</sub> TFR zero-point for the same galaxies over the same period. This implies the total mass-to-stellar mass ratio of those galaxies has decreased by a factor of ≈ 0.4 since <em>z</em> ≈ 1 at fixed rotation velocity, whilst their K-band stellar mass-to- light ratio has increased by a factor of ≈ 1.6. Moderate rates of star formation in galaxies and continued gas accretion since <em>z</em> ≈ 1 can explain these changes. Second, we take a step toward an independent measure of the TFR evolution over the same period using carbon monoxide (CO) emission from galaxies as an alternative kinematic tracer. We present the <em>M</em><sub>*</sub> and <em>Wide-Field Infrared Survey Explorer</em> absolute Band 1 magnitude (MW1) TFRs for galaxies from the CO Legacy Database for the <em>Galex</em> Arecibo SDSS Survey (COLD GASS) as <em>z</em> ≈ 0 benchmarks that are pre-requisites to extend the CO TFR to <em>z</em> &gsim; 1. We find no significant offsets between the COLD GASS TFR zero-points and those of similar <em>z</em> ≈ 0 studies. The slope of the <em>M</em><sub>*</sub> COLD GASS TFR agrees with those of similar <em>z</em> ≈ 0 studies, but the MW1 TFR slope is slightly shallower than previous studies at a similar redshift. We attribute this to the fact that the COLD GASS sample comprises galaxies of various (late-type) morphologies. Nevertheless, our work provides a robust reference point with which to compare future CO TFR studies.</p> |
| spellingShingle | Astronomy Tiley, A Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation |
| title | Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation |
| title_full | Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation |
| title_fullStr | Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation |
| title_full_unstemmed | Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation |
| title_short | Probing the evolution of galaxies since z ~ 1 with the Tully-Fisher relation |
| title_sort | probing the evolution of galaxies since z 1 with the tully fisher relation |
| topic | Astronomy |
| work_keys_str_mv | AT tileya probingtheevolutionofgalaxiessincez1withthetullyfisherrelation |