J/A+A/589/A109 Metal enrichment in semi-analytical model (Cousin+, 2016)
Metal enrichment in semi-analytical model, fundamental scaling relations, and
the case of Milky Way galaxies.
Cousin M., Buat V., Boissier S., Bethermin M., Roehlly Y. Genois M.
<Astron. Astrophys. 589, A109 (2016)>
=2016A&A...589A.109C 2016A&A...589A.109C (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Galaxy catalogs
Keywords: galaxies: formation - galaxies: evolution - galaxies: star formation -
galaxies: fundamental parameters
Abstract:
Gas flows play a fundamental role in galaxy formation and evolution,
providing the fuel for the star formation process. These mechanisms
leave an imprint in the amount of heavy elements that enrich the
interstellar medium (ISM). Thus, the analysis of this metallicity
signature provides additional constraint on the galaxy formation
scenario.
We aim to discriminate between four different galaxy formation models
based on two accretion scenarios and two different star formation
recipes. We address the impact of a bimodal accretion scenario and a
strongly regulated star formation recipe on the metal enrichment
process of galaxies.
We present a new extension of the eGalICS model, which allows us to
track the metal enrichment process in both stellar populations and in
the gas phase. Based on stellar metallicity bins from 0 to
2.5Z☉, our new chemodynamical model is applicable for situations
ranging from metal-free primordial accretion to very enriched
interstellar gas contents. We use this new tool to predict the
metallicity evolution of both the stellar populations and gas phase.
We compare these predictions with recent observational measurements.
We also address the evolution of the gas metallicity with the star
formation rate (SFR). We then focus on a sub-sample of Milky Way-like
galaxies. We compare both the cosmic stellar mass assembly and the
metal enrichment process of such galaxies with observations and
detailed chemical evolution models.
Description:
The repository contains outputs from the different models:
- m1: Classical (only hot gas) isotropic accretion scenario + Standard
Shmidt Kennicutt law
- m2: Bimodal accretion (cold streams) + Standard Shmidt Kennicutt law
- m3: Classical (only hot gas) isotropic accretion scenario + ad-hoc
non-star forming gas reservoir
- m4: Bimodal accretion (cold streams) + ad-hoc non-star forming gas
reservoir
For each model of these models dada are saved in eGalICS_m*.fits file.
All these fits-formated files are compatible with the TOPCAT software
available on: http://www.star.bris.ac.uk/~mbt/topcat/
We also provide, for each Initial Mass Function available, a set of
two fits-formated files associated to the chemodynamical library
presented in the paper. For these two files, data are available for
all metallicity bins used.
- masslossrates_IMF.fits: The instantaneous total ejecta rate
associated to a SSP for the six different main-ISM elements.
- SNratesIMF.fits: The total SN rate (SNII+SNIa [nb/Gyr]) associated
to a SSP, individual contribution of SNII and SNIa are also given.
These files are available for four different IMFs: Salpeter+55
(1955ApJ...121..161S 1955ApJ...121..161S), Chabrier+03 (2003PASP..115..763C 2003PASP..115..763C), Kroupa+93
(2001MNRAS.322..231K 2001MNRAS.322..231K) and Scalo+98 (1998ASPC..142..201S 1998ASPC..142..201S. Both ejecta
rates and SN rates are computed for the complete list of stellar ages
provided in the BC03 spectra library. They are saved in fits-formated
files and structured with different extensions corresponding to the
different initial stellar metallicity bins.
We finally provide the median star formation history, the median gas
accretion history and the metal enrichment histories associated to our
MW-sisters sample: MWsistershistories.dat
If you used data associated to eGalICS semi-analytic model, please
cite the following paper:
Cousin et al., 2015A&A...575A..33C 2015A&A...575A..33C, "Toward a new modelling of gas
flows in a semi-analytical model of galaxy formation and evolution"
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 183 12 List of fits files
mwsister.dat 75 94 Median star formation history, the median gas
accretion history and the metal enrichment
histories associated to our MW-sisters sample
files/* . 12 Individual fits files
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See also:
VI/143 : Galaxy stellar mass assembly (Cousin+, 2015)
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 32 A32 --- FileName Name of the fits file in subdirectory files
34-183 A150 --- Title Title for the file
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Byte-by-byte Description of file: mwsister.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 15 E12.7 Gyr Age Age
19- 30 E12.7 Msun/yr gacr Gas accretion rate
34- 45 E12.7 Msun/yr SFR Stellar formation rate
49- 60 E12.7 [-] 12+log(O/H) Abundance, 12+log(O/H)
63- 75 E13.7 [-] [Fe/H] ?=-9.999999e+02 Metallicity (1)
--------------------------------------------------------------------------------
Note (1): A galaxy without Fe have [Fe/H]=-9.999999e+02
--------------------------------------------------------------------------------
Acknowledgements:
Morgane Cousin, morgane.cousin(at)lam.fr
References:
Cousin et al., 2015A&A...575A..32C 2015A&A...575A..32C, Cat. VI/143
Cousin et al., 2015A&A...575A..33C 2015A&A...575A..33C, Cat. VI/143
(End) Patricia Vannier [CDS] 19-Apr-2016