Metallicity gradient of the thick disc progenitor at high redshift
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Kawata, Daisuke; Prieto, Carlos Allende; Brook, Chris B.; Casagrande, Luca; Ciuca, Ioana; Gibson, Brad K.; Grand, Robert J. J.; Hayden, Michael R.; Hunt, Jason A. S.
Description
We have developed a novel Markov Chain Monte Carlo chemical 'painting' technique to explore possible radial and vertical metallicity gradients for the thick disc progenitor. In our analysis, we match an N-body simulation to the data from the Apache Point Observatory Galactic Evolution Experiment survey.We assume that the thick disc has a constant scaleheight and has completed its formation at an early epoch, after which time radial mixing of its stars has taken place. Under these assumptions,...[Show more]
dc.contributor.author | Kawata, Daisuke | |
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dc.contributor.author | Prieto, Carlos Allende | |
dc.contributor.author | Brook, Chris B. | |
dc.contributor.author | Casagrande, Luca | |
dc.contributor.author | Ciuca, Ioana | |
dc.contributor.author | Gibson, Brad K. | |
dc.contributor.author | Grand, Robert J. J. | |
dc.contributor.author | Hayden, Michael R. | |
dc.contributor.author | Hunt, Jason A. S. | |
dc.date.accessioned | 2021-05-13T00:14:11Z | |
dc.date.available | 2021-05-13T00:14:11Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/232986 | |
dc.description.abstract | We have developed a novel Markov Chain Monte Carlo chemical 'painting' technique to explore possible radial and vertical metallicity gradients for the thick disc progenitor. In our analysis, we match an N-body simulation to the data from the Apache Point Observatory Galactic Evolution Experiment survey.We assume that the thick disc has a constant scaleheight and has completed its formation at an early epoch, after which time radial mixing of its stars has taken place. Under these assumptions, we find that the initial radial metallicity gradient of the thick disc progenitor should not be negative, but either flat or even positive, to explain the current negative vertical metallicity gradient of the thick disc. Our study suggests that the thick disc was built-up in an inside-out and upside-down fashion, and older, smaller and thicker populations are more metal poor. In this case, star-forming discs at different epochs of the thick disc formation are allowed to have different radial metallicity gradients, including a negative one, which helps to explain a variety of slopes observed in high-redshift disc galaxies. This scenario helps to explain the positive slope of the metallicity-rotation velocity relation observed for the Galactic thick disc. On the other hand, radial mixing flattens the slope of an existing gradient. | |
dc.description.sponsorship | DK and IC acknowledge the support of the UK’s Science & Technology Facilities Council (STFC Grants ST/K000977/1 and ST/N000811/1). CAP is thankful to the Spanish MINECO for funding through grant AYA2014-56359-P. LC gratefully acknowledges support from the Australian Research Council (grants DP150100250, FT160100402). RJJG acknowledges support by the DFG Research Centre SFB-881 ‘The Milky Way System’, through project A1. JH is supported by a Dunlap Fellowship at the Dunlap Institute for Astronomy & Astrophysics, funded through an endowment established by the Dunlap family and the University of Toronto. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Blackwell Publishing Ltd | |
dc.rights | © 2017 The Authors | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.subject | methods: numerical | |
dc.subject | Galaxy: disc | |
dc.subject | Galaxy: kinematics and dynamics | |
dc.title | Metallicity gradient of the thick disc progenitor at high redshift | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 473 | |
dcterms.dateAccepted | 2017-09-20 | |
dc.date.issued | 2017-09-25 | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | a383154xPUB9262 | |
local.publisher.url | https://academic.oup.com/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Kawata, Daisuke, UCL, Mullard Space Science Laboratory | |
local.contributor.affiliation | Prieto, Carlos Allende, Instituto de Astrof´ısica de Canarias | |
local.contributor.affiliation | Brook, Chris B., Instituto de Astrofisica de Canarias | |
local.contributor.affiliation | Casagrande, Luca, College of Science, ANU | |
local.contributor.affiliation | Ciuca, Ioana, University College London | |
local.contributor.affiliation | Gibson, Brad K., University of Hull, E.A. Milne Centre for Astrophysics | |
local.contributor.affiliation | Grand, Robert J. J., Heidelberger Institut für Theoretische Studien | |
local.contributor.affiliation | Hayden, Michael R., Universite de Nice Sophia Antipolis | |
local.contributor.affiliation | Hunt, Jason A. S., University of Toronto | |
dc.relation | http://purl.org/au-research/grants/arc/DP150100250 | |
dc.relation | http://purl.org/au-research/grants/arc/FT160100402 | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 867 | |
local.bibliographicCitation.lastpage | 878 | |
local.identifier.doi | 10.1093/MNRAS/STX2464 | |
dc.date.updated | 2020-11-23T11:47:50Z | |
local.identifier.scopusID | 2-s2.0-85040258364 | |
dcterms.accessRights | Open Access | |
dc.provenance | https://v2.sherpa.ac.uk/id/publication/24618..."Published version can be made open access on institutional repository" from SHERPA/RoMEO site (as at 13.5.2021) | |
Collections | ANU Research Publications |
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