The SAMI galaxy survey: stellar population radial gradients in early-type galaxies
We study the internal radial gradients of the stellar populations in a sample comprising 522 early-type galaxies (ETGs) from the SAMI (Sydney-AAO Multi-object Integral field spectrograph) Galaxy Survey. We stack the spectra of individual spaxels in radial bins, and derive basic stellar population pr...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/266380 2024-01-14T10:10:22+01:00 The SAMI galaxy survey: stellar population radial gradients in early-type galaxies Ferreras, Ignacio Scott, Nicholas La Barbera, F Croom, Scott M van de Sande, Jesse Hopkins, Andrew M. Colless, Matthew Barone, Tania D'Eugenio, Francesco Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Konstantopoulos, Iraklis S. Medling, Anne application/pdf http://hdl.handle.net/1885/266380 https://doi.org/10.1093/mnras/stz2095 https://openresearch-repository.anu.edu.au/bitstream/1885/266380/3/01_Ferreras_The_SAMI_galaxy_survey%253A_2019.pdf.jpg en_AU eng Blackwell Publishing Ltd http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FT180100231 http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/CE110001020 0035-8711 http://hdl.handle.net/1885/266380 doi:10.1093/mnras/stz2095 https://openresearch-repository.anu.edu.au/bitstream/1885/266380/3/01_Ferreras_The_SAMI_galaxy_survey%253A_2019.pdf.jpg © 2019 The authors Monthly Notices of the Royal Astronomical Society galaxies: elliptical and lenticular cD galaxies: evolution galaxies: formation galaxies: stellar content Journal article ftanucanberra https://doi.org/10.1093/mnras/stz2095 2023-12-15T09:33:08Z We study the internal radial gradients of the stellar populations in a sample comprising 522 early-type galaxies (ETGs) from the SAMI (Sydney-AAO Multi-object Integral field spectrograph) Galaxy Survey. We stack the spectra of individual spaxels in radial bins, and derive basic stellar population properties: total metallicity ([Z/H]), [Mg/Fe], [C/Fe] and age. The radial gradient (∇) and central value of the fits (evaluated at Re/4) are compared against a set of six observables that may act as drivers of the trends. We find that velocity dispersion (σ) – or, equivalently gravitational potential – is the dominant driver of the chemical composition gradients. Surface mass density is also correlated with the trends, especially with stellar age. The decrease of ∇[Mg/Fe] with increasing σ is contrasted by a rather shallow dependence of ∇[Z/H] with σ (although this radial gradient is overall rather steep). This result, along with a shallow age slope at the massive end, imposes a substantial constraint on the progenitors of the populations that contribute to the formation of the outer envelopes of ETGs. The SAMI sample is split, by design, between ‘field’ and cluster galaxies. Only weak environment-related differences are found, most notably a stronger dependence of central total metallicity ([Z/H]e4) with σ, along with a marginal trend of ∇[Z/H] to steepen in cluster galaxies, a result that is not followed by [Mg/Fe]. The results presented here serve as stringent constraints on numerical models of the formation and evolution of ETGs. IF gratefully acknowledges support from the AAO through their distinguished visitor programme, as well as funding from the Royal Society. NS acknowledges support of a University of Sydney Postdoctoral Research Fellowship. Support for AMM is provided by NASA through Hubble Fellowship grant #HST-HF2-51377 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5- 26555 Article in Journal/Newspaper sami Australian National University: ANU Digital Collections Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) Monthly Notices of the Royal Astronomical Society 489 1 608 622 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
galaxies: elliptical and lenticular cD galaxies: evolution galaxies: formation galaxies: stellar content |
spellingShingle |
galaxies: elliptical and lenticular cD galaxies: evolution galaxies: formation galaxies: stellar content Ferreras, Ignacio Scott, Nicholas La Barbera, F Croom, Scott M van de Sande, Jesse Hopkins, Andrew M. Colless, Matthew Barone, Tania D'Eugenio, Francesco Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Konstantopoulos, Iraklis S. Medling, Anne The SAMI galaxy survey: stellar population radial gradients in early-type galaxies |
topic_facet |
galaxies: elliptical and lenticular cD galaxies: evolution galaxies: formation galaxies: stellar content |
description |
We study the internal radial gradients of the stellar populations in a sample comprising 522 early-type galaxies (ETGs) from the SAMI (Sydney-AAO Multi-object Integral field spectrograph) Galaxy Survey. We stack the spectra of individual spaxels in radial bins, and derive basic stellar population properties: total metallicity ([Z/H]), [Mg/Fe], [C/Fe] and age. The radial gradient (∇) and central value of the fits (evaluated at Re/4) are compared against a set of six observables that may act as drivers of the trends. We find that velocity dispersion (σ) – or, equivalently gravitational potential – is the dominant driver of the chemical composition gradients. Surface mass density is also correlated with the trends, especially with stellar age. The decrease of ∇[Mg/Fe] with increasing σ is contrasted by a rather shallow dependence of ∇[Z/H] with σ (although this radial gradient is overall rather steep). This result, along with a shallow age slope at the massive end, imposes a substantial constraint on the progenitors of the populations that contribute to the formation of the outer envelopes of ETGs. The SAMI sample is split, by design, between ‘field’ and cluster galaxies. Only weak environment-related differences are found, most notably a stronger dependence of central total metallicity ([Z/H]e4) with σ, along with a marginal trend of ∇[Z/H] to steepen in cluster galaxies, a result that is not followed by [Mg/Fe]. The results presented here serve as stringent constraints on numerical models of the formation and evolution of ETGs. IF gratefully acknowledges support from the AAO through their distinguished visitor programme, as well as funding from the Royal Society. NS acknowledges support of a University of Sydney Postdoctoral Research Fellowship. Support for AMM is provided by NASA through Hubble Fellowship grant #HST-HF2-51377 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5- 26555 |
format |
Article in Journal/Newspaper |
author |
Ferreras, Ignacio Scott, Nicholas La Barbera, F Croom, Scott M van de Sande, Jesse Hopkins, Andrew M. Colless, Matthew Barone, Tania D'Eugenio, Francesco Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Konstantopoulos, Iraklis S. Medling, Anne |
author_facet |
Ferreras, Ignacio Scott, Nicholas La Barbera, F Croom, Scott M van de Sande, Jesse Hopkins, Andrew M. Colless, Matthew Barone, Tania D'Eugenio, Francesco Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Konstantopoulos, Iraklis S. Medling, Anne |
author_sort |
Ferreras, Ignacio |
title |
The SAMI galaxy survey: stellar population radial gradients in early-type galaxies |
title_short |
The SAMI galaxy survey: stellar population radial gradients in early-type galaxies |
title_full |
The SAMI galaxy survey: stellar population radial gradients in early-type galaxies |
title_fullStr |
The SAMI galaxy survey: stellar population radial gradients in early-type galaxies |
title_full_unstemmed |
The SAMI galaxy survey: stellar population radial gradients in early-type galaxies |
title_sort |
sami galaxy survey: stellar population radial gradients in early-type galaxies |
publisher |
Blackwell Publishing Ltd |
url |
http://hdl.handle.net/1885/266380 https://doi.org/10.1093/mnras/stz2095 https://openresearch-repository.anu.edu.au/bitstream/1885/266380/3/01_Ferreras_The_SAMI_galaxy_survey%253A_2019.pdf.jpg |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
Hubble |
geographic_facet |
Hubble |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society |
op_relation |
http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FT180100231 http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/CE110001020 0035-8711 http://hdl.handle.net/1885/266380 doi:10.1093/mnras/stz2095 https://openresearch-repository.anu.edu.au/bitstream/1885/266380/3/01_Ferreras_The_SAMI_galaxy_survey%253A_2019.pdf.jpg |
op_rights |
© 2019 The authors |
op_doi |
https://doi.org/10.1093/mnras/stz2095 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
489 |
container_issue |
1 |
container_start_page |
608 |
op_container_end_page |
622 |
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1788065063403257856 |