J/MNRAS/448/1430 A framework for empirical galaxy phenomenology (Munoz+, 2015)
A framework for empirical galaxy phenomenology: the scatter in galaxy ages
and stellar metallicities.
Munoz J.A., Peeples M.S.
<Mon. Not. R. Astron. Soc., 448, 1430-1445 (2015)>
=2015MNRAS.448.1430M 2015MNRAS.448.1430M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Models, evolutionary ; Redshifts
Keywords: galaxies: abundances - galaxies: dwarf - galaxies: evolution -
galaxies: formation
Abstract:
We develop a theoretical framework that extracts a deeper understanding
of galaxy formation from empirically derived relations among galaxy
properties by extending the main-sequence integration method for
computing galaxy star formation histories. We properly account for
scatter in the stellar mass-star formation rate relation and the
evolving fraction of passive systems and find that the latter effect
is almost solely responsible for the age distributions among z∼0 galaxies
with stellar masses above ∼1010 M☉. However, while we
qualitatively agree with the observed median stellar metallicity as a
function of stellar mass, we attribute our inability to reproduce the
distribution in detail largely to a combination of imperfect gas-phase
metallicity and α/Fe ratio calibrations. Our formalism will
benefit from new observational constraints and, in turn, improve
interpretations of future data by providing self-consistent star
formation histories for population synthesis modelling.
Description:
In this study, we develop a cohesive theoretical formalism for
translating empirical relations into an understanding of the
variations in galactic star formation histories. We achieve this goal
by incorporating into the Main Sequence Integration (MSI) method the
scatter suggested by the evolving fraction of quiescent galaxies and
the spread in the observed stellar mass-star formation rate relation.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
models.dat 49 30 List of models
tablesd1/* 228 36 Galaxy properties
--------------------------------------------------------------------------------
See also:
J/A+A/288/713 : Star formation in galaxies (Firmani+ 1994)
Byte-by-byte Description of file: models.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.2 --- zf [0/2.0] Redshift of formation zf
6- 9 A4 --- Calib Fundamental metallicity relation (FMR)
calibration (1)
11- 13 A3 --- Type Galaxy type in the file (2)
15- 49 A35 --- FileName File name in subdirectory tablesd1
--------------------------------------------------------------------------------
Note (1): FMR calibration as follows:
KD02 = Kewley & Dopita (2002ApJS..142...35K 2002ApJS..142...35K);
M10 = Mannucci et al. (2010MNRAS.408.2115M 2010MNRAS.408.2115M);
PP04 = Pettini & Pagel (2004MNRAS.348L..59P 2004MNRAS.348L..59P);
Z94 = Zaritsky et al. (1994ApJ...420...87Z 1994ApJ...420...87Z).
Note (2): Type as follows:
SF = Star-forming galaxies;
P = Passive galaxies;
All = All galaxies.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablesd1/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.1 [Msun] logM* [8.5/12] Log of stellar mass at redshift zf
6- 12 F7.5 [yr] logLA16 16th percentile of log luminosity-weighted age
14- 20 F7.5 [yr] logLA50 50th percentile of log luminosity-weighted age
22- 29 F8.5 [yr] logLA84 84th percentile of log luminosity-weighted age
31- 41 F11.8 [Sun] logLZ16 16th percentile of log luminosity-weighted
stellar metallicity
43- 54 F12.9 [Sun] logLZ50 50th percentile of log luminosity-weighted
stellar metallicity
56- 66 F11.8 [Sun] logLZ84 84th percentile of log luminosity-weighted
stellar metallicity
68- 74 F7.5 [yr] logMA16 16th percentile of log mass-weighted age
76- 82 F7.5 [yr] logMA50 50th percentile of log mass-weighted age
84- 91 F8.5 [yr] logMA84 84th percentile of log mass-weighted age
93-102 F10.7 [Sun] logMZ16 16th percentile of log mass-weighted stellar
metallicity
104-114 F11.8 [Sun] logMZ50 50th percentile of log mass-weighted stellar
metallicity
116-128 F13.8 [Sun] logMZ84 84th percentile of log mass-weighted stellar
metallicity
130-139 F10.7 --- z90-16 16th percentile of the redshift at which
90 per cent of the final stellar mass is reached
141-149 F9.7 --- z90-50 50th percentile of the redshift at which
90 per cent of the final stellar mass is reached
151-158 F8.6 --- z90-84 84th percentile of the redshift at which
90 per cent of the final stellar mass is reached
160-167 F8.6 --- z50-16 16th percentile of the redshift at which
50 per cent of the final stellar mass is reached
169-176 F8.6 --- z50-50 50th percentile of the redshift at which
50 per cent of the final stellar mass is reached
178-185 F8.6 --- z50-84 84th percentile of the redshift at which
50 per cent of the final stellar mass is reached
187-199 F13.7 --- zq16 ?=-999. 16th percentile of the quenching redshift
(1)
201-214 F14.8 --- zq50 ?=-999. 50th percentile of the quenching redshift
(1)
216-228 F13.7 --- zq84 ?=-999. 84th percentile of the quenching redshift
(1)
--------------------------------------------------------------------------------
Note (1): Values of "-999" for the quenching redshift indicate that a value
could not be determined because not enough realizations resulted in a
passive system at the final redshift.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 21-Nov-2017