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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

The majority of galaxies with current star formation rates (SFRs), SFRo &gt;= 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&apos;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.

Název v anglickém jazyce

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

Popis výsledku anglicky

The majority of galaxies with current star formation rates (SFRs), SFRo &gt;= 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&apos;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA20-21855S" target="_blank" >GA20-21855S: Dynamika hustých hvězdokup s primordiálními dvojhvězdami a černými veledírami</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

497

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

37-43

Kód UT WoS článku

000574919600003

EID výsledku v databázi Scopus

2-s2.0-85096959012