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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423401" target="_blank" >RIV/00216208:11320/20:10423401 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=sljaUmUf9S" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=sljaUmUf9S</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staa1851" target="_blank" >10.1093/mnras/staa1851</a>

Result language
angličtina
Original language name
Constraints on the star formation histories of galaxies in the Local Cosmological Volume
Original language description
The majority of galaxies with current star formation rates (SFRs), SFRo >= 10(-3) M-circle dot 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-t models, according to which the opposite would be expected. The tension is apparent in that local galaxies imply the star formation time-scale tau approximate to 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 proportional to(t - t(1))(eta) for t(1) = 1.8 Gyr (with no stars forming prior to t(1)) implies that eta = 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.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
<a href="/en/project/GA20-21855S" target="_blank" >GA20-21855S: The dynamics of dense star clusters with primordial binaries and massive black holes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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