The Most Luminous Protostars in Molecular Clouds: A Hint to Understand the Stellar Initial Mass Function

2002 ◽  
Vol 4 ◽  
pp. 139-139 ◽  
Author(s):  
K. Dobashi ◽  
Y. Yonekura ◽  
T. Matsumoto ◽  
M. Momose ◽  
F. Sato ◽  
...  
Keyword(s):  
Molecular Clouds ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Stellar Initial Mass Function

scholarly journals The Most Luminous Protostars in Molecular Clouds: A Hint to Understand the Stellar Initial Mass Function

2001 ◽  
Vol 53 (1) ◽  
pp. 85-92 ◽  
Author(s):  
Kazuhito Dobashi ◽  
Yoshinori Yonekura ◽  
Tomoaki Matsumoto ◽  
Munetake Momose ◽  
Fumio Sato ◽  
...  
Keyword(s):  
Molecular Clouds ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Stellar Initial Mass Function

scholarly journals The role of molecular filaments in the origin of the prestellar core mass function and stellar initial mass function

2019 ◽  
Vol 629 ◽  
pp. L4 ◽  
Author(s):  
Ph. André ◽  
D. Arzoumanian ◽  
V. Könyves ◽  
Y. Shimajiri ◽  
P. Palmeirim
Keyword(s):  
Power Law ◽  
Molecular Clouds ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Core Mass ◽  
Filamentary Structure ◽  
Star Forming ◽  
Prestellar Cores ◽  
Stellar Initial Mass Function

Context. The origin of the stellar initial mass function (IMF) is one of the most debated issues in astrophysics. Aims. Here we explore the possible link between the quasi-universal filamentary structure of star-forming molecular clouds and the origin of the IMF. Methods. Based on our recent comprehensive study of filament properties from Herschel Gould Belt survey observations, we derive, for the first time, a good estimate of the filament mass function (FMF) and filament line mass function (FLMF) in nearby molecular clouds. We use the observed FLMF to propose a simple toy model for the origin of the prestellar core mass function (CMF), relying on gravitational fragmentation of thermally supercritical but virialized filaments. Results. We find that the FMF and the FLMF have very similar shapes and are both consistent with a Salpeter-like power-law function (dN/dlog Mline ∝ Mline−1.5±0.1) in the regime of thermally supercritical filaments (Mline >  16 M⊙ pc−1). This is a remarkable result since, in contrast, the mass distribution of molecular clouds and clumps is known to be significantly shallower than the Salpeter power-law IMF, with dN/dlog Mcl ∝ Mcl−0.7. Conclusions. Since the vast majority of prestellar cores appear to form in thermally transcritical or supercritical filaments, we suggest that the prestellar CMF and by extension the stellar IMF are at least partly inherited from the FLMF through gravitational fragmentation of individual filaments.

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 The Mass Spectra of Cores in Turbulent Molecular Clouds and Implications for the Initial Mass Function

2006 ◽  
Vol 637 (1) ◽  
pp. 384-391 ◽  
Author(s):  
Javier Ballesteros‐Paredes ◽  
Adriana Gazol ◽  
Jongsoo Kim ◽  
Ralf S. Klessen ◽  
Anne‐Katharina Jappsen ◽  
...  
Keyword(s):  
Molecular Clouds ◽  
Mass Spectra ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass

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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