IMF&ndashMetallicity: A Tight Local Relation Revealed by the CALIFA Survey

  title={IMF\&ndashMetallicity: A Tight Local Relation Revealed by the CALIFA Survey},
  author={Ignacio Mart'in-Navarro and Alexandre Vazdekis and Francesco La Barbera and Jes'us Falc'on-Barroso and Mariya Lyubenova and Glenn van de Ven and Ignacio Ferreras and Sebasti'an F. S'anchez and Scott C. Trager and Rub'en Garc'ia-Benito and Damian Mast and M. A. Mendoza and Patricia S'anchez-Bl'azquez and Rosa M. Gonz{\'a}lez Delgado and C. Jakob Walcher and the Califa team},
  journal={The Astrophysical Journal},
Variations in the stellar initial mass function (IMF) have been invoked to explain the spectroscopic and dynamical properties of early-type galaxies (ETGs). However, no observations have yet been able to disentangle the physical driver. We analyze here a sample of 24 ETGs drawn from the CALIFA survey, deriving in a homogeneous way their stellar population and kinematic properties. We find that the local IMF is tightly related to the local metallicity, becoming more bottom-heavy toward metal… 

Figures from this paper

Simulating a metallicity-dependent initial mass function: consequences for feedback and chemical abundances
Observational and theoretical arguments increasingly suggest that the initial mass function (IMF) of stars may depend systematically on environment, yet most galaxy formation models to date assume a
Is it possible to reconcile extragalactic IMF variations with a universal Milky Way IMF?
One of the most robust observations of the stellar initial mass function (IMF) is its near-universality in the Milky Way and neighbouring galaxies. But recent observations of early-type galaxies
Implications of a variable IMF for the interpretation of observations of galaxy populations
We investigate the effect of a metallicity-dependent stellar initial mass function (IMF), as deduced observationally by Martin-Navarro et al. (2015c), on the inferred stellar masses and star
Galaxy properties as revealed by MaNGA – I. Constraints on IMF and M*/L gradients in ellipticals
We estimate ages, metallicities, α-element abundance ratios, and stellar initial mass functions (IMFs) of elliptical (E) and S0 galaxies from the MaNGA-DR15 survey. We stack spectra and use a
Disentangling the physical parameters of gaseous nebulae and galaxies
We present an analysis to disentangle the connection between physical quantities that characterize the conditions of ionized H ii regions – metallicity (Z), ionization parameter (U), and electron
[α/Fe] traced by H II regions from the CALIFA survey
Context. Differential enrichment between α and Fe-peak elements is known to be strongly connected with the shape of the star formation history (SFH), the star formation efficiency (SFE), the inflow
Revisiting the bulge–halo conspiracy – II. Towards explaining its puzzling dependence on redshift
We carry out a systematic investigation of the total mass density profile of massive (log M-star/M-circle dot similar to 11.5) early-type galaxies and its dependence on redshift, specifically in the
Calibrated, cosmological hydrodynamical simulations with variable IMFs – II. Correlations between the IMF and global galaxy properties
The manner in which the stellar initial mass function (IMF) scales with global galaxy properties is under debate. We use two hydrodynamical, cosmological simulations to predict possible trends for
IMF shape constraints from stellar populations and dynamics from CALIFA
In this Paper, we describe how we use stellar dynamics information to constrain the shape of the stellar initial mass function (IMF) in a sample of 27 early-type galaxies from the CALIFA survey. We
SDSS-IV MaNGA: stellar initial mass function variation inferred from Bayesian analysis of the integral field spectroscopy of early-type galaxies
We analyze the stellar initial mass functions (IMF) of a large sample of early type galaxies (ETGs) provided by MaNGA. The large number of IFU spectra of individual galaxies provide high


The initial mass function of a massive relic galaxy
Massive relic galaxies formed the bulk of their stellar component before z � 2 and have remained unaltered since then. Therefore, they represent a unique opportunity to study in great detail the
A Universal Stellar Initial Mass Function? A critical look at variations in extreme environments
Whether the stellar initial mass function (IMF) is universal or is instead sensitive to environmental conditions is of critical importance: The IMF influences most observable properties of stellar
Radial variations in the stellar initial mass function of early-type galaxies
The hypothesis of a universal initial mass function (IMF) -- motivated by observations in nearby stellar systems -- has been recently challenged by the discovery of a systematic variation of the IMF
Evidence for top-heavy stellar initial mass functions with increasing density and decreasing metallicity
ABSTRACT Residual-gas expulsion after cluster formation has recently been shown to leave animprint in the low-mass present-day stellar mass function (PDMF) which allowedthe estimation of birth
The stellar initial mass function (IMF) is a key parameter for studying galaxy evolution. Here we measure the IMF mass normalization for a sample of 68 field galaxies in the redshift range 0.7-0.9
Systematic variation of the stellar initial mass function with velocity dispersion in early-type galaxies
An essential component of galaxy formation theory is the stellarinitial mass function (IMF) that describes the parent distribution ofstellar mass in star-forming regions. We present observational
The (galaxy-wide) IMF in giant elliptical galaxies: From top to bottom
Recent evidence based independently on spectral line strengths and dynamical modelling point towards a non-universal stellar Initial Mass Function (IMF), probably implying an excess of low-mass stars
SPIDER VIII - constraints on the stellar initial mass function of early-type galaxies from a variety of spectral features
We perform a spectroscopic study to constrain the stellar initial mass function (IMF) by using a large sample of 24 781 early-type galaxies from the Sloan Digital Sky Survey-based Spheroids
The initial mass function of early-type galaxies: no correlation with [Mg/Fe]
The Initial Mass Function (IMF) of early-type galaxies (ETGs) has been found to feature systematic variations by both dynamical and spectroscopic studies. In particular, spectral line strengths,
MIUSCAT: extended MILES spectral coverage – II. Constraints from optical photometry
In the present work we show a comprehensive comparison of our new stellar population synthesis MIUSCAT models with photometric data of globular clusters and early-type galaxies. The models compare