scholarly journals Variations of the stellar initial mass function in semi-analytical models: implications for the mass assembly and the chemical enrichment of galaxies in the gaea model

2016 ◽  
Vol 464 (4) ◽  
pp. 3812-3824 ◽  
Author(s):  
Fabio Fontanot ◽  
Gabriella De Lucia ◽  
Michaela Hirschmann ◽  
Gustavo Bruzual ◽  
Stéphane Charlot ◽  
...  
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Analytical Models ◽  
Initial Mass ◽  
Chemical Enrichment ◽  
Stellar Initial Mass Function ◽  
Mass Assembly

scholarly journals Variations of the stellar Initial Mass Function in semi-analytic models: Implications for the mass assembly of galaxies in the GAEA model

2019 ◽  
Vol 15 (S341) ◽  
pp. 124-128
Author(s):  
Fabio Fontanot
Keyword(s):  
Galaxy Evolution ◽  
Mass Function ◽  
Spectroscopic Studies ◽  
Initial Mass Function ◽  
Star Formation History ◽  
Initial Mass ◽  
Chemical Enrichment ◽  
Statistical Indicator ◽  
Stellar Initial Mass Function ◽  
Stellar Masses

AbstractA wealth of observations recently challenged the notion of a universal stellar initial mass function (IMF) by showing evidences in favour of a variability of this statistical indicator as a function of galaxy properties. I present predictions from the semi-analytic model gaea (GAlaxy Evolution and Assembly), which features (a) a detailed treatment of chemical enrichment, (b) an improved stellar feedback scheme, and (c) implements theoretical prescriptions for IMF variations. Our variable IMF realizations predict intrinsic stellar masses and mass-to-light ratios larger than those estimated from synthetic photometry assuming a universal IMF. This provides a self-consistent interpretation for the observed mismatch between photometrically inferred stellar masses of local early-type galaxies and those derived by dynamical and spectroscopic studies. At higher redshifts, the assumption of a variable IMF has a deep impact on our ability to reconstruct the evolution of the galaxy stellar mass function and the star formation history of galaxies.

scholarly journals Is the stellar initial mass function universal?

2016 ◽  
Vol 57 (2) ◽  
pp. 2.32-2.36 ◽  
Author(s):  
Ignacio Ferreras ◽  
Francesco La Barbera ◽  
Alexandre Vazdekis
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Stellar Initial Mass Function

scholarly journals EVIDENCE FOR ENVIRONMENTAL DEPENDENCE OF THE UPPER STELLAR INITIAL MASS FUNCTION IN ORION A

2013 ◽  
Vol 764 (2) ◽  
pp. 114 ◽  
Author(s):  
Wen-Hsin Hsu ◽  
Lee Hartmann ◽  
Lori Allen ◽  
Jesús Hernández ◽  
S. T. Megeath ◽  
...  
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Stellar Initial Mass Function ◽  
Environmental Dependence

scholarly journals The Stellar Initial Mass Function in Starburst Galaxies

1999 ◽  
Vol 186 ◽  
pp. 243-250
Author(s):  
Claus Leitherer
Keyword(s):  
Massive Stars ◽  
Mass Function ◽  
Starburst Galaxies ◽  
Initial Mass Function ◽  
Initial Mass ◽  
H Ii Regions ◽  
Environmental Properties ◽  
Stellar Initial Mass Function ◽  
Low Mass ◽  
Star Formation Histories

Starburst galaxies are currently forming massive stars at prodigious rates. I discuss the star-formation histories and the shape of the initial mass function, with particular emphasis on the high- and on the low-mass end. The classical Salpeter IMF is consistent with constraints from observations of the most massive stars, irrespective of environmental properties. The situation at the low-mass end is less clear: direct star counts in nearby giant H II regions show stars down to ~1 M⊙, whereas dynamical arguments in some starburst galaxies suggest a deficit of such stars.

scholarly journals New Wolf-Rayet galaxies – IMF in starbursts

1999 ◽  
Vol 193 ◽  
pp. 600-601
Author(s):  
JieHao Huang ◽  
Q. S. Gu ◽  
L. Ji ◽  
W. Zheng
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Stellar Initial Mass Function

We report the discovery of two new Wolf-Rayet galaxies: Mrk 1039, and F8208+2816. Two broad WR bumps at 5808Å and 4650Å indicate the presence of WCE and WNL star populations in these two sources. Comparison of the observed EW(HeII λ4686) and EW(CIV λ5808) with recent models of WR populations in young starbursts provide an indication that the stellar initial mass function in some WR galaxies might not be Salpeter-like.

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