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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

  • Czech description

Classification

  • 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)

Result continuities

  • Project

  • 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

  • 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