Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology

    General
    Description

    Welcome to the Traces of Galaxy Formation research group website.

    We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.

    A complex star formation history, as the one expected to describe galaxy evolution, needs a multidisciplinary approach to be fully understood. Our group at the IAC consists of experienced researchers in cosmological simulations, dynamical studies, stellar populations and morphological properties of galaxies up to high redshift. We combine different approaches (e.g. observations and theory, secular and cosmological evolution studies) to obtain a complete view of the dominant mechanisms driving the evolution of galaxies.

    Within this general framework, we are currently exploring three main areas of research:

    1. Stellar population synthesis models
      • Development of new stellar population synthesis models
      • Stellar population analysis tools
      • Universality of the stellar initial mass function (IMF)
       
    2. Cosmic evolution of galaxies
      • Massive galaxy evolution
      • Stellar populations in different environments
      • Low surface brightness science
      • Machine learning and cosmological simulations
       
    3. Evolutionary processes in nearby galaxies
      • The role of black holes in the evolution of galaxies
      • Surveys of nearby galaxies
      • Stellar kinematics and dynamical models

    If you want to get in contact or work with us, please send an email to the head of the group (Ignacio Martín-Navarro ignacio.martin [at] iac.es (ignacio[dot]martin[at]iac[dot]es)).

    Principal investigator

    Here you can find some of our most recent highlights:

    Related publications

    • Massive Relic Galaxies Challenge the Co-evolution of Super-massive Black Holes and Their Host Galaxies
      We study a sample of eight massive galaxies that are extreme outliers (3–5σ) in the {M}\bullet ‑ Mbulge local scaling relation. Two of these galaxies are confirmed to host extremely large super-massive black holes (SMBHs), whereas the virial mass estimates for the other six are also consistent with having abnormally large SMBHs. From the analysis
      Ferré-Mateu, A. et al.

      Advertised on:

      7
      2015
      Citations
      67
    • The BaLROG project - I. Quantifying the influence of bars on the kinematics of nearby galaxies
      We present the BaLROG (Bars in Low Redshift Optical Galaxies) sample of 16 morphologically distinct barred spirals to characterize observationally the influence of bars on nearby galaxies. Each galaxy is a mosaic of several pointings observed with the integral-field unit (IFU) SAURON leading to a tenfold sharper spatial resolution (˜100 pc)
      Seidel, M. K. et al.

      Advertised on:

      7
      2015
      Citations
      36
    • 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 frozen stellar population properties of those galaxies that populated the primitive Universe. We have combined optical to near-infrared line-strength
      Martín-Navarro, I. et al.

      Advertised on:

      7
      2015
      Citations
      75
    • Virgo cluster and field dwarf ellipticals in 3D - III. Spatially and temporally resolved stellar populations
      We present the stellar population analysis of a sample of 12 dwarf elliptical galaxies, observed with the SAURON integral field unit, using the full-spectrum fitting method. We show that star formation histories (SFHs) resolved into two populations can be recovered even within a limited wavelength range, provided that high signal-to-noise ratio (S
      Ryś, A. et al.

      Advertised on:

      9
      2015
      Citations
      20
    • Constraints on the evolutionary mechanisms of massive galaxies since z ∼ 1 from their velocity dispersions
      Several authors have reported that the dynamical masses of massive compact galaxies (M* ≳ 1011 M⊙, re ∼ 1 kpc), computed as Mdyn = 5.0 σe2 re/G, are lower than their stellar masses M*. In a previous study from our group, the discrepancy is interpreted as a breakdown of the assumption of homology that underlie the Mdyn determinations. Here, we
      Sánchez-Bláquez, P. et al.

      Advertised on:

      10
      2015
      Citations
      8
    • IMF&ndashMetallicity: A Tight Local Relation Revealed by the CALIFA Survey
      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
      Martín-Navarro, I. et al.

      Advertised on:

      6
      2015
      Citations
      114
    • Central star formation and metallicity in CALIFA interacting galaxies
      We use optical integral-field spectroscopic (IFS) data from 103 nearby galaxies at different stages of the merging event, from close pairs to merger remnants provided by the CALIFA survey, to study the impact of the interaction in the specific star formation and oxygen abundance on different galactic scales. To disentangle the effect of the
      Barrera-Ballesteros, J. K. et al.

      Advertised on:

      7
      2015
      Citations
      67
    • Formation of S0 galaxies through mergers. Explaining angular momentum and concentration change from spirals to S0s
      The CALIFA team has recently found that the stellar angular momentum and concentration of late-type spiral galaxies are incompatible with those of lenticular galaxies (S0s), concluding that fading alone cannot satisfactorily explain the evolution from spirals into S0s. Here we explore whether major mergers can provide an alternative way to
      Querejeta, M. et al.

      Advertised on:

      7
      2015
      Citations
      59
    • The trace of a substantial assembly of massive E-S0 galaxies at 0.8 < z < 1.5 in galaxy number counts
      K-band galaxy number counts (GNCs) exhibit a slope change at K ˜ 17.5 mag not present in optical bands. To unveil the nature of this feature, we have derived the contribution of different galaxy types to the total K-band GNCs at 0.3 z 1.5 by redshift bins and compared the results with expectations from several galaxy evolutionary models. We show
      Prieto, M. et al.

      Advertised on:

      8
      2015
      Citations
      7
    • Evidence for temporal evolution in the M33 disc as traced by its star clusters
      We present precision radial velocities and stellar population parameters for 77 star clusters in the Local Group galaxy M33. Our Gran Telescopio de Canarias and William Herschel Telescope observations sample both young, massive clusters and known/candidate globular clusters (GCs), spanning ages ˜106-1010 yr, and metallicities, [M/H] ˜ -1.7 to solar
      Beasley, M. A. et al.

      Advertised on:

      8
      2015
      Citations
      35
    • A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
      We present new wide-field photometry and spectroscopy of the globular clusters (GCs) around NGC 4649 (M60), the third brightest galaxy in the Virgo cluster. Imaging of NGC 4649 was assembled from a recently obtained Hubble Space Telescope/Advanced Camera for Surveys mosaic, and new Subaru/Suprime-Cam and archival Canada-France-Hawaii Telescope
      Pota, V. et al.

      Advertised on:

      6
      2015
      Citations
      22
    • CALIFA, the Calar Alto Legacy Integral Field Area survey. III. Second public data release
      This paper describes the Second Public Data Release (DR2) of the Calar Alto Legacy Integral Field Area (CALIFA) survey. The data for 200 objects are made public, including the 100 galaxies of the First Public Data Release (DR1). Data were obtained with the integral-field spectrograph PMAS/PPak mounted on the 3.5 m telescope at the Calar Alto
      García-Benito, R. et al.

      Advertised on:

      4
      2015
      Citations
      190
    • Bar pattern speeds in CALIFA galaxies. I. Fast bars across the Hubble sequence
      Context. The bar pattern speed (Ωb) is defined as the rotational frequency of the bar, and it determines the bar dynamics. Several methods have been proposed for measuring Ωb. The non-parametric method proposed by Tremaine & Weinberg (1984, ApJ, 282, L5; TW) and based on stellar kinematics is the most accurate. This method has been applied so far
      Aguerri, J. A. L. et al.

      Advertised on:

      4
      2015
      Citations
      98
    • Stellar population synthesis models between 2.5 and 5 μm based on the empirical IRTF stellar library
      We present the first single-burst stellar population models in the infrared wavelength range between 2.5 and 5 μm which are exclusively based on empirical stellar spectra. Our models take as input 180 spectra from the stellar IRTF (Infrared Telescope Facility) library. Our final single-burst stellar population models are calculated based on two
      Röck, B. et al.

      Advertised on:

      5
      2015
      Citations
      46
    • Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
      We present models that predict spectra of old- and intermediate-aged stellar populations at 2.51 Å (FWHM) with varying [α/Fe] abundance. The models are based on the MILES library and on corrections from theoretical stellar spectra. The models employ recent [Mg/Fe] determinations for the MILES stars and BaSTI scaled-solar and α-enhanced isochrones
      Vazdekis, A. et al.

      Advertised on:

      5
      2015
      Citations
      281
    • A cosmological context for compact massive galaxies
      To provide a quantitative cosmological context to ongoing observational work on the formation histories and location of compact massive galaxies, we locate and study a sample of exceptionally compact systems in the BOLSHOI simulation, using the dark matter structural parameters from a real, compact massive galaxy (NGC 1277) as a basis for our
      Stringer, M. et al.

      Advertised on:

      5
      2015
      Citations
      28
    • 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, based on gravity-sensitive features, suggest an excess of low-mass stars in massive ETGs, i.e. a bottom-heavy IMF. The physical drivers of IMF variations
      La Barbera, F. et al.

      Advertised on:

      4
      2015
      Citations
      36
    • Stellar Kinematics and Structural Properties of Virgo Cluster Dwarf Early-type Galaxies from the SMAKCED Project. III. Angular Momentum and Constraints on Formation Scenarios
      We analyze the stellar kinematics of 39 dwarf early-type galaxies (dEs) in the Virgo Cluster. Based on the specific stellar angular momentum λRe and the ellipticity, we find 11 slow rotators and 28 fast rotators. The fast rotators in the outer parts of the Virgo Cluster rotate significantly faster than fast rotators in the inner parts of the
      Toloba, E. et al.

      Advertised on:

      2
      2015
      Citations
      58
    • Further evidence for a time-dependent initial mass function in massive early-type galaxies
      Spectroscopic analyses of gravity-sensitive line strengths give growing evidence towards an excess of low-mass stars in massive early-type galaxies (ETGs). Such a scenario requires a bottom-heavy initial mass function (IMF). However, strong constraints can be imposed if we take into account galactic chemical enrichment. We extend the analysis of
      Vazdekis, A. et al.

      Advertised on:

      3
      2015
      Citations
      43
    • Discovery of true, likely and possible symbiotic stars in the dwarf spheroidal NGC 205
      In this paper we discuss the photometric and spectroscopic observations of newly discovered (symbiotic) systems in the dwarf spheroidal galaxy NGC 205. The Gemini Multi-Object Spectrograph on-off band [O III] 5007 Å emission imaging highlighted several [O III] line emitters, for which optical spectra were then obtained. The detailed study of the
      Gonçalves, D. R. et al.

      Advertised on:

      2
      2015
      Citations
      19

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