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Title: SDSS-IV MaNGA: Excavating the fossil record of stellar populations in spiral galaxies

Abstract

ABSTRACT We perform a ‘fossil record’ analysis for ≈800 low-redshift spiral galaxies, using starlight applied to integral field spectroscopic observations from the SDSS-IV MaNGA survey to obtain fully spatially resolved high-resolution star formation histories (SFHs). From the SFHs, we are able to build maps indicating the present-day distribution of stellar populations of different ages in each galaxy. We find small negative mean age gradients in most spiral galaxies, especially at high stellar mass, which reflects the formation times of stellar populations at different galactocentric radii. We show that the youngest (<108.5 yr) populations exhibit significantly more extended distributions than the oldest (>109.5 yr), again with a strong dependence on stellar mass. By interpreting the radial profiles of ‘time slices’ as indicative of the size of the galaxy at the time those populations had formed, we are able to trace the simultaneous growth in mass and size of the spiral galaxies over the last 10 Gyr. Despite finding that the evolution of the measured light-weighted radius is consistent with inside-out growth in the majority of spiral galaxies, the evolution of an equivalent mass-weighted radius has changed little over the same time period. Since radial migration effects are likely to be small, we conclude thatmore » the growth of discs in spiral galaxies has occurred predominantly through an inside-out mode (with the effect greatest in high-mass galaxies), but this has not had anywhere near as much impact on the distribution of mass within spiral galaxies.« less

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [4];  [5]
  1. School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
  2. Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 70–264, 04510 CDMX, México
  3. Instituto de Física (IF), Universidade Federal do Rio Grande do Sul, CP 15051, Porto Alegre 91501-970, RS, Brazil, Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro 20921-400, RJ, Brazil
  4. Instituto de Astrofísica de Canarias, Vía Láctea S/N, E-38205 La Laguna, Spain, Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain
  5. McDonald Observatory, The University of Texas at Austin, 1 University Station, Austin, TX 78712, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1631895
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 495 Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Peterken, Thomas, Merrifield, Michael, Aragón-Salamanca, Alfonso, Fraser-McKelvie, Amelia, Avila-Reese, Vladimir, Riffel, Rogério, Knapen, Johan, and Drory, Niv. SDSS-IV MaNGA: Excavating the fossil record of stellar populations in spiral galaxies. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa1303.
Peterken, Thomas, Merrifield, Michael, Aragón-Salamanca, Alfonso, Fraser-McKelvie, Amelia, Avila-Reese, Vladimir, Riffel, Rogério, Knapen, Johan, & Drory, Niv. SDSS-IV MaNGA: Excavating the fossil record of stellar populations in spiral galaxies. United Kingdom. doi:https://doi.org/10.1093/mnras/staa1303
Peterken, Thomas, Merrifield, Michael, Aragón-Salamanca, Alfonso, Fraser-McKelvie, Amelia, Avila-Reese, Vladimir, Riffel, Rogério, Knapen, Johan, and Drory, Niv. Wed . "SDSS-IV MaNGA: Excavating the fossil record of stellar populations in spiral galaxies". United Kingdom. doi:https://doi.org/10.1093/mnras/staa1303.
@article{osti_1631895,
title = {SDSS-IV MaNGA: Excavating the fossil record of stellar populations in spiral galaxies},
author = {Peterken, Thomas and Merrifield, Michael and Aragón-Salamanca, Alfonso and Fraser-McKelvie, Amelia and Avila-Reese, Vladimir and Riffel, Rogério and Knapen, Johan and Drory, Niv},
abstractNote = {ABSTRACT We perform a ‘fossil record’ analysis for ≈800 low-redshift spiral galaxies, using starlight applied to integral field spectroscopic observations from the SDSS-IV MaNGA survey to obtain fully spatially resolved high-resolution star formation histories (SFHs). From the SFHs, we are able to build maps indicating the present-day distribution of stellar populations of different ages in each galaxy. We find small negative mean age gradients in most spiral galaxies, especially at high stellar mass, which reflects the formation times of stellar populations at different galactocentric radii. We show that the youngest (<108.5 yr) populations exhibit significantly more extended distributions than the oldest (>109.5 yr), again with a strong dependence on stellar mass. By interpreting the radial profiles of ‘time slices’ as indicative of the size of the galaxy at the time those populations had formed, we are able to trace the simultaneous growth in mass and size of the spiral galaxies over the last 10 Gyr. Despite finding that the evolution of the measured light-weighted radius is consistent with inside-out growth in the majority of spiral galaxies, the evolution of an equivalent mass-weighted radius has changed little over the same time period. Since radial migration effects are likely to be small, we conclude that the growth of discs in spiral galaxies has occurred predominantly through an inside-out mode (with the effect greatest in high-mass galaxies), but this has not had anywhere near as much impact on the distribution of mass within spiral galaxies.},
doi = {10.1093/mnras/staa1303},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 495,
place = {United Kingdom},
year = {2020},
month = {5}
}

Journal Article:
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DOI: https://doi.org/10.1093/mnras/staa1303

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