The variation of integrated star initial mass functions among galaxies

  title={The variation of integrated star initial mass functions among galaxies},
  author={Carsten Weidner and Pavel Kroupa},
  journal={The Astrophysical Journal},
The integrated galaxial initial mass function (IGIMF) is the relevant distribution function containing the information on the distribution of stellar remnants, the number of supernovae, and the chemical enrichment history of a galaxy. Since most stars form in embedded star clusters with different masses, the IGIMF becomes an integral of the assumed (universal or invariant) stellar IMF over the embedded star cluster mass function (ECMF). For a range of reasonable assumptions about the IMF and… 
On the Similarity between Cluster and Galactic Stellar Initial Mass Functions
The stellar initial mass functions (IMFs) for the Galactic bulge, the Milky Way, other galaxies, clusters of galaxies, and the integrated stars in the universe are composites from countless
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Star formation rates (SFRs) larger than 1000 Myr −1 are observed in extreme starbursts. This leads to the formation of star clusters with masses >10 6 Min which crowding of the pre-stellar cores may
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Impact of metallicity and star formation rate on the time-dependent, galaxy-wide stellar initial mass function
The stellar initial mass function (IMF) is commonly assumed to be an invariant probability density distribution function of initial stellar masses. These initial stellar masses are generally
Star-Formation Rates of Galaxies
The measured star-formation rates (SFRs) of galaxies comprise an important constraint on galaxy evolution and also on their cosmological boundary conditions. Any available tracer of the SFR depends
Simple interpolation functions for the galaxy-wide stellar initial mass function and its effects in early-type galaxies
The galaxy-wide stellar initial mass function (IGIMF) of a galaxy is thought to depend on its star formation rate (SFR). Using a catalogue of observational properties of early-type galaxies (ETGs)
The galaxy-wide initial mass function of dwarf late-type to massive early-type galaxies
Observational studies are showing that the galaxy-wide stellar initial mass function are top-heavy in galaxies with high star-formation rates (SFRs). Calculating the integrated galactic stellar
Galaxy and Mass Assembly (GAMA): the star formation rate dependence of the stellar initial mass function
The stellar initial mass function (IMF) describes the distribution in stellar masses produced from a burst of star formation. For more than 50 yr, the implicit assumption underpinning most areas of
Cosmic History of the Integrated Galactic Stellar Initial Mass Function: A Simulation Study
ABSTRACT Theoretical as well as observational studies suggest that the stellar initial mass func-tion (IMF) might become top heavy with increasing redshift. Embedded cluster massfunction is a power


Galactic-Field Initial Mass Functions of Massive Stars
Over the past years observations of young and populous star clusters have shown that the stellar initial mass function (IMF) appears to be an invariant featureless Salpeter power law with an exponent
Faint stars in the Ursa Minor dwarf spheroidal galaxy: implications for the low-mass stellar initial mass function at high redshift
The stellar initial mass function at high redshift is an important defining property of the first stellar systems to form and may also play a role in various dark matter problems. We here determine
Evidence for a fundamental stellar upper mass limit from clustered star formation
The observed masses of the most massive stars do not surpass about 150 M ○. . This may either be a fundamental upper mass limit which is defined by the physics of massive stars and/or their
The Mass Function of Young Star Clusters in the "Antennae" Galaxies.
  • Zhang, Fall
  • Physics, Medicine
    The Astrophysical journal
  • 1999
The mass function of the young star clusters in the merging galaxies known as the "Antennae" (NGC 4038/9) is found to be well represented by a power law of the form psi&parl0;M&parr0;~M-2 over the range 104 less, similarMLess, similar106 M middle dot in circle.
The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
Combining IMF estimates for different populations in which the stars can be observed individually unveils an extraordinary uniformity of the IMF, which appears to hold for populations including present-day star formation in small molecular clouds.
Galactic-Field IMFs of Massive Stars
Over the past years observations of young and populous star clusters have shown that the stellar IMF appears to be an invariant featureless Salpeter power-law with an exponent alpha=2.35 for stars
Mass segregation in young compact star clusters in the Large Magellanic Cloud — II. Mass functions
We review the complications involved in the conversion of stellar luminosities into masses and apply a range of mass-to-luminosity relations to our Hubble Space Telescope observations of the young
On the variation of the initial mass function
A universal initial mass function (IMF) is not intuitive, but so far no convincing evidence for a variable IMF exists. The detection of systematic variations of the IMF with star-forming conditions
On the determination of age and mass functions of stars in young open star clusters from the analysis of their luminosity functions
We construct the observed luminosity functions of the remote young open clusters NGC 2383, 2384, 4103, 4755, 7510 and Hogg 15 from CCD observations of them. The observed LFs are corrected for field
The Low End of the Initial Mass Function in Young Clusters. II. Evidence for Primordial Mass Segregation in NGC 330 in the Small Magellanic Cloud
As part of a larger program aimed at investigating the universality of the initial mass function (IMF) at low masses in a number of young clusters in the LMC and SMC, we present a new study of the