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Constraints on the star formation histories of galaxies in the Local Cosmological Volume

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Kroupa_2021_MNRAS_Constraints_star_formation_VoR.pdf (521.8Kb)
Date
09/2020
Author
Kroupa, P.
Haslbauer, M.
Banik, I.
Nagesh, S. T.
Pflamm-Altenburg, J.
Keywords
Galaxies: evolution
Galaxies: formation
Galaxies: star formation
Galaxies: stellar content
Galaxy: evolution
Galaxy: formation
QB Astronomy
QC Physics
Space and Planetary Science
Astronomy and Astrophysics
3rd-DAS
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Abstract
The majority of galaxies with current star formation rates (SFRs), SFRo≥10−3M⊙yr−1⁠, in the Local Cosmological Volume, where observations should be reliable, have the property that their observed SFRo is larger than their average SFR. This is in tension with the evolution of galaxies described by delayed-τ models, according to which the opposite would be expected. The tension is apparent in that local galaxies imply the star formation time-scale τ ≈ 6.7 Gyr, much longer than the 3.5–4.5 Gyr obtained using an empirically determined main sequence at several redshifts. Using models where the SFR is a power law in time of the form ∝(t − t1)η for t1 = 1.8 Gyr (with no stars forming prior to t1) implies that η = 0.18 ± 0.03. This suggested near-constancy of a galaxy’s SFR over time raises non-trivial problems for the evolution and formation time of galaxies, but is broadly consistent with the observed decreasing main sequence with increasing age of the Universe.
Citation
Kroupa , P , Haslbauer , M , Banik , I , Nagesh , S T & Pflamm-Altenburg , J 2020 , ' Constraints on the star formation histories of galaxies in the Local Cosmological Volume ' , Monthly Notices of the Royal Astronomical Society , vol. 497 , no. 1 , pp. 37-43 . https://doi.org/10.1093/mnras/staa1851
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/staa1851
ISSN
0035-8711
Type
Journal article
Rights
Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/staa1851.
Description
IB is supported by an Alexander von Humboldt postdoctoral research fellowship. PK acknowledges support from the Grant Agency of the Czech Republic under grant number 20-21855S. This work benefited from the International Space Science Institute (ISSI/ISSI-BJ) in Bern and Beijing, thanks to the funding of the team ‘Chemical abundances in the ISM: the litmus test of stellar IMF variations in galaxies across cosmic time’ (Donatella Romano and Zhi-Yu Zhang).
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  • University of St Andrews Research
URL
https://arxiv.org/abs/2007.07905
URI
http://hdl.handle.net/10023/24120

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