The NewHorizon simulation – to bar or not to bar
We use the NEWHORIZON simulation to study the redshift evolution of bar properties and fractions within galaxies in the stellar masses range M⋆ = 107.25–1011.4M⊙ over the redshift range of z = 0.25–1.3. We select disc galaxies using stellar kinematics as a proxy for galaxy morphology. We employ two...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Oxford University Press
2022
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| _version_ | 1826308174072774656 |
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| author | Reddish, J Kraljic, K Petersen, MS Tep, K Dubois, Y Pichon, C Peirani, S Bournaud, F Choi, H Devriendt, J Jackson, R Martin, G Park, MJ Volonteri, M Yi, SK |
| author_facet | Reddish, J Kraljic, K Petersen, MS Tep, K Dubois, Y Pichon, C Peirani, S Bournaud, F Choi, H Devriendt, J Jackson, R Martin, G Park, MJ Volonteri, M Yi, SK |
| author_sort | Reddish, J |
| collection | OXFORD |
| description | We use the NEWHORIZON simulation to study the redshift evolution of bar properties and fractions within galaxies in the stellar masses range M⋆ = 107.25–1011.4M⊙ over the redshift range of z = 0.25–1.3. We select disc galaxies using stellar kinematics as a proxy for galaxy morphology. We employ two different automated bar detection methods, coupled with visual inspection, resulting in observable bar fractions of fbar = 0.070+0.018−0.012 at z ∼ 1.3, decreasing to fbar = 0.011+0.014−0.003 at z ∼ 0.25. Only one galaxy is visually confirmed as strongly barred in our sample. This bar is hosted by the most massive disc and only survives from z = 1.3 down to z = 0.7. Such a low bar fraction, in particular amongst Milky Way-like progenitors, highlights a missing bars problem, shared by literally all cosmological simulations with spatial resolution <100 pc to date. The analysis of linear growth rates, rotation curves, and derived summary statistics of the stellar, gas and dark matter components suggest that galaxies with stellar masses below 109.5−1010M⊙ in NEWHORIZON appear to be too dominated by dark matter relative to stellar content to form a bar, while more massive galaxies typically have formed large bulges that prevent bar persistence at low redshift. This investigation confirms that the evolution of the bar fraction puts stringent constraints on the assembly history of baryons and dark matter on to galaxies. |
| first_indexed | 2024-03-07T07:15:34Z |
| format | Journal article |
| id | oxford-uuid:95cdc4be-ab26-4348-a8fa-19a28371b6c2 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:15:34Z |
| publishDate | 2022 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:95cdc4be-ab26-4348-a8fa-19a28371b6c22022-08-05T09:58:53ZThe NewHorizon simulation – to bar or not to barJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:95cdc4be-ab26-4348-a8fa-19a28371b6c2EnglishSymplectic ElementsOxford University Press2022Reddish, JKraljic, KPetersen, MSTep, KDubois, YPichon, CPeirani, SBournaud, FChoi, HDevriendt, JJackson, RMartin, GPark, MJVolonteri, MYi, SKWe use the NEWHORIZON simulation to study the redshift evolution of bar properties and fractions within galaxies in the stellar masses range M⋆ = 107.25–1011.4M⊙ over the redshift range of z = 0.25–1.3. We select disc galaxies using stellar kinematics as a proxy for galaxy morphology. We employ two different automated bar detection methods, coupled with visual inspection, resulting in observable bar fractions of fbar = 0.070+0.018−0.012 at z ∼ 1.3, decreasing to fbar = 0.011+0.014−0.003 at z ∼ 0.25. Only one galaxy is visually confirmed as strongly barred in our sample. This bar is hosted by the most massive disc and only survives from z = 1.3 down to z = 0.7. Such a low bar fraction, in particular amongst Milky Way-like progenitors, highlights a missing bars problem, shared by literally all cosmological simulations with spatial resolution <100 pc to date. The analysis of linear growth rates, rotation curves, and derived summary statistics of the stellar, gas and dark matter components suggest that galaxies with stellar masses below 109.5−1010M⊙ in NEWHORIZON appear to be too dominated by dark matter relative to stellar content to form a bar, while more massive galaxies typically have formed large bulges that prevent bar persistence at low redshift. This investigation confirms that the evolution of the bar fraction puts stringent constraints on the assembly history of baryons and dark matter on to galaxies. |
| spellingShingle | Reddish, J Kraljic, K Petersen, MS Tep, K Dubois, Y Pichon, C Peirani, S Bournaud, F Choi, H Devriendt, J Jackson, R Martin, G Park, MJ Volonteri, M Yi, SK The NewHorizon simulation – to bar or not to bar |
| title | The NewHorizon simulation – to bar or not to bar |
| title_full | The NewHorizon simulation – to bar or not to bar |
| title_fullStr | The NewHorizon simulation – to bar or not to bar |
| title_full_unstemmed | The NewHorizon simulation – to bar or not to bar |
| title_short | The NewHorizon simulation – to bar or not to bar |
| title_sort | newhorizon simulation to bar or not to bar |
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