The SAMI Galaxy Survey: stellar population gradients of central galaxies
We examine the stellar population radial gradients (age, metallicity and [$α/$Fe]) of $\sim$ 100 passive central galaxies up to $\sim 2 R_e$. The targeted groups have a halo mass range spanning from $11 < \log(M_{200}/M_{\odot}) < 15$, in the SAMI Galaxy Survey. The main goal of this work is t...
Main Authors: | , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
arXiv
2020
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.2005.00541 https://arxiv.org/abs/2005.00541 |
id |
ftdatacite:10.48550/arxiv.2005.00541 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.2005.00541 2023-05-15T18:11:53+02:00 The SAMI Galaxy Survey: stellar population gradients of central galaxies Santucci, Giulia Brough, Sarah Scott, Nicholas Montes, Mireia Owers, Matt S. van de Sande, Jesse Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Ferreras, Ignacio Lawrence, Jon S. López-Sánchez, Ángel R. Richards, Samuel N. 2020 https://dx.doi.org/10.48550/arxiv.2005.00541 https://arxiv.org/abs/2005.00541 unknown arXiv https://dx.doi.org/10.3847/1538-4357/ab92a9 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Astrophysics of Galaxies astro-ph.GA FOS Physical sciences article-journal Article ScholarlyArticle Text 2020 ftdatacite https://doi.org/10.48550/arxiv.2005.00541 https://doi.org/10.3847/1538-4357/ab92a9 2022-03-10T15:36:47Z We examine the stellar population radial gradients (age, metallicity and [$α/$Fe]) of $\sim$ 100 passive central galaxies up to $\sim 2 R_e$. The targeted groups have a halo mass range spanning from $11 < \log(M_{200}/M_{\odot}) < 15$, in the SAMI Galaxy Survey. The main goal of this work is to determine whether central galaxies have different stellar population properties when compared to similarly massive satellite galaxies. We find negative metallicity radial gradients, which become shallower with increasing stellar mass. The age and [$α$/Fe] gradients are consistent with zero or slightly positive. [$α$/Fe] gradients become more negative with increasing mass, while age gradients do not show any significant trend with mass. We do not observe a significant difference between the stellar population gradients of central and satellite galaxies, at fixed stellar mass. The mean metallicity gradients are $\overline{Δ[Z/H]/Δ\log(r/R_e)} = -0.25 \pm 0.03$ for central galaxies and $\overline{Δ[Z/H]/Δ\log(r/R_e)} = -0.30 \pm 0.01$ for satellites. The mean age and [$α$/Fe] gradients are consistent between central and satellite galaxies, within the uncertainties, with a mean value of $\overline{Δ\textrm{log (Age/Gyr)}/Δ\log(r/R_e)} = 0.13 \pm 0.03$ for centrals and $\overline{Δ\textrm{log (Age/Gyr)}/Δ\log(r/R_e)} = 0.17 \pm 0.01$ for satellite and $\overline{Δ[α/Fe]/Δ\log(r/R_e)} = 0.01 \pm 0.03$ for centrals and $\overline{Δ[α/Fe]/Δ\log(r/R_e)} = 0.08 \pm 0.01$ for satellites. This evidence suggests that the central region of central passive galaxies form in a similar fashion to satellite passive galaxies, in agreement with a two-phase formation scenario. : 20 pages. Accepted for publication in ApJ Article in Journal/Newspaper sami DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
spellingShingle |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences Santucci, Giulia Brough, Sarah Scott, Nicholas Montes, Mireia Owers, Matt S. van de Sande, Jesse Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Ferreras, Ignacio Lawrence, Jon S. López-Sánchez, Ángel R. Richards, Samuel N. The SAMI Galaxy Survey: stellar population gradients of central galaxies |
topic_facet |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
description |
We examine the stellar population radial gradients (age, metallicity and [$α/$Fe]) of $\sim$ 100 passive central galaxies up to $\sim 2 R_e$. The targeted groups have a halo mass range spanning from $11 < \log(M_{200}/M_{\odot}) < 15$, in the SAMI Galaxy Survey. The main goal of this work is to determine whether central galaxies have different stellar population properties when compared to similarly massive satellite galaxies. We find negative metallicity radial gradients, which become shallower with increasing stellar mass. The age and [$α$/Fe] gradients are consistent with zero or slightly positive. [$α$/Fe] gradients become more negative with increasing mass, while age gradients do not show any significant trend with mass. We do not observe a significant difference between the stellar population gradients of central and satellite galaxies, at fixed stellar mass. The mean metallicity gradients are $\overline{Δ[Z/H]/Δ\log(r/R_e)} = -0.25 \pm 0.03$ for central galaxies and $\overline{Δ[Z/H]/Δ\log(r/R_e)} = -0.30 \pm 0.01$ for satellites. The mean age and [$α$/Fe] gradients are consistent between central and satellite galaxies, within the uncertainties, with a mean value of $\overline{Δ\textrm{log (Age/Gyr)}/Δ\log(r/R_e)} = 0.13 \pm 0.03$ for centrals and $\overline{Δ\textrm{log (Age/Gyr)}/Δ\log(r/R_e)} = 0.17 \pm 0.01$ for satellite and $\overline{Δ[α/Fe]/Δ\log(r/R_e)} = 0.01 \pm 0.03$ for centrals and $\overline{Δ[α/Fe]/Δ\log(r/R_e)} = 0.08 \pm 0.01$ for satellites. This evidence suggests that the central region of central passive galaxies form in a similar fashion to satellite passive galaxies, in agreement with a two-phase formation scenario. : 20 pages. Accepted for publication in ApJ |
format |
Article in Journal/Newspaper |
author |
Santucci, Giulia Brough, Sarah Scott, Nicholas Montes, Mireia Owers, Matt S. van de Sande, Jesse Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Ferreras, Ignacio Lawrence, Jon S. López-Sánchez, Ángel R. Richards, Samuel N. |
author_facet |
Santucci, Giulia Brough, Sarah Scott, Nicholas Montes, Mireia Owers, Matt S. van de Sande, Jesse Bland-Hawthorn, Joss Bryant, Julia J. Croom, Scott M. Ferreras, Ignacio Lawrence, Jon S. López-Sánchez, Ángel R. Richards, Samuel N. |
author_sort |
Santucci, Giulia |
title |
The SAMI Galaxy Survey: stellar population gradients of central galaxies |
title_short |
The SAMI Galaxy Survey: stellar population gradients of central galaxies |
title_full |
The SAMI Galaxy Survey: stellar population gradients of central galaxies |
title_fullStr |
The SAMI Galaxy Survey: stellar population gradients of central galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: stellar population gradients of central galaxies |
title_sort |
sami galaxy survey: stellar population gradients of central galaxies |
publisher |
arXiv |
publishDate |
2020 |
url |
https://dx.doi.org/10.48550/arxiv.2005.00541 https://arxiv.org/abs/2005.00541 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://dx.doi.org/10.3847/1538-4357/ab92a9 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.2005.00541 https://doi.org/10.3847/1538-4357/ab92a9 |
_version_ |
1766184483930767360 |