Comparison of stellar populations in simulated and real post-starburst galaxies in MaNGA

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Zheng , Y , Wild , V , Lahen , N , Johansson , P H , Law , D , Weaver , J R & Jimenez , N 2020 , ' Comparison of stellar populations in simulated and real post-starburst galaxies in MaNGA ' , Monthly Notices of the Royal Astronomical Society , vol. 498 , no. 1 , pp. 1259-1277 . https://doi.org/10.1093/mnras/staa2358

Title: Comparison of stellar populations in simulated and real post-starburst galaxies in MaNGA
Author: Zheng, Yirui; Wild, Vivienne; Lahen, Natalia; Johansson, Peter H.; Law, David; Weaver, John R.; Jimenez, Noelia
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Particle Physics and Astrophysics

Date: 2020-10
Language: eng
Number of pages: 19
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/staa2358
URI: http://hdl.handle.net/10138/322451
Abstract: Recent integral field spectroscopic (IFS) surveys have revealed radial gradients in the optical spectral indices of post-starburst (PSB) galaxies, which can be used to constrain their formation histories. We study the spectral indices of post-processed mock IFS datacubes of binary merger simulations, carefully matched to the properties of the MaNGA IFS survey, with a variety of black hole (BH) feedback models, progenitor galaxies, orbits, and mass ratios. Based on our simulation sample, we find that only major mergers on prograde-prograde or retrograde-prograde orbits in combination with a mechanical BH feedback model can form galaxies with weak enough ongoing star formation, and therefore absent H alpha emission, to be selected by traditional PSB selection methods. We find strong fluctuations in nebular emission line strengths, even within the PSB phase, suggesting that H alpha selected PSBs are only a subsample of the underlying population. The global PSB population can be more robustly identified using stellar continuum-based approaches. The difficulty in reproducing the very young PSBs in simulations potentially indicates that new sub-resolution star formation recipes are required to properly model the process of star formation quenching. In our simulations, we find that the starburst peaks at the same time at all radii, but is stronger and more prolonged in the inner regions. This results in a strong time evolution in the radial gradients of the spectral indices that can be used to estimate the age of the starburst without reliance on detailed star formation histories from spectral synthesis models.
Subject: galaxies: evolution
galaxies: interactions
galaxies: star formation
galaxies: stellar content
STAR-FORMATION HISTORIES
DELTA-STRONG GALAXIES
SMOOTHED PARTICLE HYDRODYNAMICS
QUASAR OUTFLOW CONTRIBUTION
ACTIVE GALACTIC NUCLEI
DIGITAL SKY SURVEY
EVOLUTIONARY SEQUENCES
BLACK-HOLES
RADIATIVE OPACITIES
E+A-GALAXIES
115 Astronomy, Space science
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