Was the Milky Way a chain galaxy? Using the IGIMF theory to constrain the thin-disc star formation history and mass
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10406392" target="_blank" >RIV/00216208:11320/19:10406392 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=26xo5mh-og" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=26xo5mh-og</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/sty2812" target="_blank" >10.1093/mnras/sty2812</a>
Alternative languages
Result language
angličtina
Original language name
Was the Milky Way a chain galaxy? Using the IGIMF theory to constrain the thin-disc star formation history and mass
Original language description
The observed present-day stellar mass function (PDMF) of the solar neighbourhood is a mixture of stellar populations born in star-forming events that occurred over the lifetime of the thin disc of the Galaxy. Assuming stars form in embedded clusters which have stellar initial mass functions (IMFs) which depend on the metallicity and density of the star-forming gas clumps, the integrated galaxy-wide IMF (IGIMF) can be calculated. The shape of the IGIMF thus depends on the star formation rate (SFR) and metallicity. Here, the shape of the PDMF for stars more massive than 1M(circle dot) in combination with the mass density in low-mass stars is used to constrain the current SFR, the star formation history (SFH), and the current stellar plus remnant mass (M-*) in the Galactic thin disc. This yields the current SFR, (M) over dot(*) = 4.1(-2.8)(+3.1)M(circle dot) yr(-1), a declining SFH, and M-* = 2.1(-1.5)(+3.0) x 10(11) M-circle dot, respectively, with a V-band stellar mass-to-light ratio of M-*/L-V = 2.79(-0.38)(+0.48). These values are consistent with independent measurements. We also quantify the surface density of black holes and neutron stars in the Galactic thin disc. The invariant canonical IMF can reproduce the PDMF of the Galaxy as well as the IGIMF, but in the universal IMF framework it is not possible to constrain any of the above Galactic properties. Assuming the IGIMF theory is the correct framework and in combination with the vertical velocity dispersion data of stars, it follows that the Milky Way would have appeared as a chain galaxy 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
2019
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
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Volume of the periodical
483
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
11
Pages from-to
46-56
UT code for WoS article
000462251000004
EID of the result in the Scopus database
2-s2.0-85063903778