The minimum mass for star formation by dynamical fragmentation: dependence on epoch, dust abundance, and environment
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00585833" target="_blank" >RIV/67985815:_____/24:00585833 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0354284" target="_blank" >https://hdl.handle.net/11104/0354284</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stae766" target="_blank" >10.1093/mnras/stae766</a>
Alternative languages
Result language
angličtina
Original language name
The minimum mass for star formation by dynamical fragmentation: dependence on epoch, dust abundance, and environment
Original language description
We estimate the minimum mass of a star formed by dynamical collapse and fragmentation, as a function of epoch, dust abundance, and environment. Epoch is parametrized by redshift, z(red), through the variation in the temperature of the cosmic microwave background. The dust abundance is parametrized by the mass-fraction in dust, Z(D), with the additional simplifying assumption that the intrinsic properties of dust do not change with Z(D), only the amount of dust. Environment is parametrized by the energy-density of the ambient suprathermal radiation fields through a dilution factor omega(*) (applied to a blackbody radiation field at T-* = 10(4 )K). The critical condition is that a spherical proto-fragment should be able to cool, and therefore contract, fast enough to detach from neighbouring proto-fragments. The minimum mass increases with increasing redshift, increasing dust abundance, and increasing suprathermal background. Values in the range from M-MIN similar to 0.002 M-circle dot to M-MIN similar to 0.2 M-circle dot are obtained at the extremes of the parameter ranges we have considered (0 <= z(red) <= 8, 0.00016 < Z(D) < 0.04, and 10(-15) <= omega(*) <= 10(-8)). Our results agree quite well with the predictions of detailed numerical simulations invoking similar redshifts and dust abundances, but our estimates are somewhat lower, we attribute this difference to resolution issues and the small-number statistics from the simulations. The increased minimum masses predicted at high redshift and/or high suprathermal background result in significantly bottom-light initial mass functions, and therefore low mass-to-light ratios, provided that the dust abundance is not too low. The changes due to high suprathermal background may be particularly important for star formation in galactic nuclei and at high redshift.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
529
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
3712-3728
UT code for WoS article
001206748700020
EID of the result in the Scopus database
2-s2.0-85188991337