J/A+A/607/A126 GalIMF version 1.0.0 (Yan+, 2017)
The optimally sampled galaxy-wide stellar initial mass function.
Observational tests and the publicly available GalIMF code.
Yan Z., Jerabkova T., Kroupa P.
<Astron. Astrophys. 607, A126 (2017)>
=2017A&A...607A.126Y 2017A&A...607A.126Y (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Galaxy catalogs
Keywords: galaxies: stellar content -
galaxies: luminosity function, mass function -
galaxies: star formation - galaxies: formation -
galaxies: star clusters: general - galaxies: evolution
Abstract:
Here we present a full description of the integrated galaxy-wide
initial mass function (IGIMF) theory in terms of the optimal sampling
and compare it with available observations. Optimal sampling is the
method we use to discretize the IMF deterministically into stellar
masses. Evidence indicates that nature may be closer to deterministic
sampling as observations suggest a smaller scatter of various relevant
observables than random sampling would give, which may result from a
high level of self-regulation during the star formation process. We
document the variation of IGIMFs under various assumptions. The
results of the IGIMF theory are consistent with the empirical relation
between the total mass of a star cluster and the mass of its most
massive star, and the empirical relation between the star formation
rate (SFR) of a galaxy and the mass of its most massive cluster.
Particularly, we note a natural agreement with the empirical relation
between the IMF power-law index and the SFR of a galaxy. The IGIMF
also results in a relation between the SFR of a galaxy and the mass of
its most massive star such that, if there were no binaries, galaxies
with SFR<10-4M☉/yr should host no Type II supernova events. In
addition, a specific list of initial stellar masses can be useful in
numerical simulations of stellar systems. For the first time, we show
optimally sampled galaxy-wide IMFs (OSGIMF) that mimic the IGIMF with
an additional serrated feature. Finally, a Python module, GalIMF, is
provided allowing the calculation of the IGIMF and OSGIMF dependent on
the galaxy-wide SFR and metallicity.
Description:
GalIMF stands for the Galaxy-wide Initial Mass Function. It is a
Python 3 module that allows users to compute galaxy-wide initial
stellar mass functions based on locally derived empirical constraints
following the IGIMF theory. See the GalIMF homepage
https://sites.google.com/view/galimf/home for more information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
galIMF-master.zip 512 382 GalIMF version 1.0.0
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Acknowledgements:
Zhiqiang Yan, yan(at)astro.uni-bonn.de
(End) Patricia Vannier [CDS] 07-Aug-2017