# Huellas de la Formación de las Galaxias: Poblaciones estelares, Dinámica y Morfología

Año de inicio
2006

General
Descripción

#### Bienvenida a la página web del grupo de investigación Traces of Galaxy Formation.

Somos un grupo de investigación amplio, diverso y muy activo cuyo objetivo principal es entender la formación de galaxias en el Universo de una manera lo más completa posible. Con el estudio detellado de las poblaciones estelares como bandera, estamos constantemente buscando y desarrollando nuevas herramientas e ideas que nos permitan entender cómo las galaxias han llegado a convertirse en lo que hoy observamos.

Una historia de formación compleja, como la que se espera describa la evolución de las galaxias, necesita de un acercamiento multidisciplinar para ser entendida. Nuestro grupo en el IAC está compuesto por personal investigador de gran experiencia en simulaciones cosmológicas, estudios dinámicos, análisis de poblaciones estelares y  caracterizaciones morfológicas de galaxias tanto locales como a alto corrimiento al rojo. Combinamos distintas alternativas (e.g. observaciones y teoría o procesos de evolución secular y cosmológica) para poder alcanzar en los próximos años una visión consistente de los mecanismos físicos que regulan la formación de las galaxias.

Dentro de este esquema general, estamos principalmente centrados en el estudio de tres líneas centrales:

1. Modelos de síntesis de poblaciones estelares
• Desarrollo de modelos de poblaciones estelares
• Métodos de análisis para el estudio de poblaciones estelares
• Universalidad de la función inicial de masa (IMF)

2. Evolución cósmica de galaxias
• Evolución de galaxias masivas
• Poblaciones estelares en distintos entornos
• Ciencia a bajo brillo superﬁcial
• Simulaciones númericas y aprendizaje automático

3. Procesos evolutivos en galaxias cercanas
• Agujeros negros como moduladores de la formación estelar
• Cinemática estelar y modelos dinámicos

Si quieres ponerte en contacto o trabajar con el grupo, por favor, envía un correo al investigador principal (Ignacio Martín-Navarro ignacio.martin [at] iac.es).

Esta es una muestra de algunos de nuestros resultados destacados más recientes:

• Galactic cirri in deep optical imaging

The ubiquitous presence of Galactic cirri in deep optical images represents a major obstacle to study the low surface brightness features of extragalactic sources. To address this issue, we have explored the optical properties of cirri using g, r, i, and z bands in the Sloan Digital Sky Survey (SDSS) Stripe82 region. Using state-of-the-art, custom

Román, Javier et al.

### Fecha de publicación:

12
2020
• The Galaxy "Missing Dark Matter" NGC 1052-DF4 is Undergoing Tidal Disruption

The existence of long-lived galaxies lacking dark matter represents a challenge to our understanding of how galaxies form. Here, we present evidence that explains the lack of dark matter in one such galaxy: NGC 1052-DF4. Deep optical imaging of the system has detected tidal tails in this object caused by its interaction with its neighboring galaxy

Montes, Mireia et al.

### Fecha de publicación:

12
2020
• Detecting outliers in astronomical images with deep generative networks

With the advent of future big-data surveys, automated tools for unsupervised discovery are becoming ever more necessary. In this work, we explore the ability of deep generative networks for detecting outliers in astronomical imaging data sets. The main advantage of such generative models is that they are able to learn complex representations

Margalef-Bentabol, Berta et al.

### Fecha de publicación:

6
2020
• Stellar masses of giant clumps in CANDELS and simulated galaxies using machine learning

A significant fraction of high redshift star-forming disc galaxies are known to host giant clumps, whose nature and role in galaxy evolution are yet to be understood. In this work, we first present a new method based on neural networks to detect clumps in galaxy images. We use this method to detect clumps in the rest-frame optical and UV images of

Huertas-Company, Marc et al.

### Fecha de publicación:

9
2020
• Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey

The centres of disc galaxies host a variety of structures built via both internal and external processes. In this study, we constrain the formation and evolution of these central structures, in particular, nuclear rings and nuclear discs, by deriving maps of mean stellar ages, metallicities, and [α/Fe] abundances. We use observations obtained with

### Fecha de publicación:

11
2020
• Kinematic signatures of nuclear discs and bar-driven secular evolution in nearby galaxies of the MUSE TIMER project

The central regions of disc galaxies hold clues to the processes that dominate their formation and evolution. To exploit this, the TIMER project has obtained high signal-to-noise and spatial resolution integral-field spectroscopy data of the inner few kpc of 21 nearby massive barred galaxies, which allows studies of the stellar kinematics in their

### Fecha de publicación:

11
2020
• The principle of maximum entropy explains the cores observed in the mass distribution of dwarf galaxies

Cold dark matter (CDM) simulations predict a central cusp in the mass distribution of galaxies. This prediction is in stark contrast with observations of dwarf galaxies that show a central plateau or "core" in their density distribution. The proposed solutions to this core-cusp problem can be classified into two types. One invokes feedback

Sánchez Almeida, Jorge et al.

### Fecha de publicación:

10
2020
• The Fornax Deep Survey with VST. X. The assembly history of the bright galaxies and intra-group light in the Fornax A subgroup

Context. We present the study of the south-west group in the Fornax cluster centred on the brightest group galaxy (BGG) Fornax A, which was observed as part of the Fornax Deep Survey (FDS). This includes the analysis of the bright group members (mB < 16 mag) and the intra-group light (IGL). Aims: The main objective of this work is to investigate

Raj, M. A. et al.

### Fecha de publicación:

8
2020
• Detection of young (≤20 Myr) stellar populations in apparently quenched low-mass galaxies using red spectral line indices

We report on the detection of a small contribution (around and below 1 per cent in mass) from young stellar components with ages ≤20 Myr in low-mass galaxies purposely selected from the MaNGA survey to be already-quenched systems. Among the sample of 28 galaxies, 8 of them show signatures of having suffered a very recent burst of star formation

de Lorenzo-Cáceres, A. et al.

### Fecha de publicación:

8
2020
• NIHAO XXIV: rotation- or pressure-supported systems? Simulated Ultra Diffuse Galaxies show a broad distribution in their stellar kinematics

In recent years, a new window on galaxy evolution opened, thanks to the increasing discovery of galaxies with a low-surface brightness, such as Ultra Diffuse Galaxies (UDGs). The formation mechanism of these systems is still a much debated question and so are their kinematical properties. In this work, we address this topic by analysing the stellar

### Fecha de publicación:

7
2020
• The SAMI-Fornax Dwarfs Survey I: sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies

Dwarf ellipticals are the most common galaxy type in cluster environments; however, the challenges associated with their observation mean that their formation mechanisms are still poorly understood. To address this, we present deep integral field observations of a sample of 31 low-mass (107.5 < M⋆ < 109.5 M☉) early-type galaxies in the Fornax

Scott, Nicholas et al.

### Fecha de publicación:

7
2020
• On the accretion of a new group of galaxies on to Virgo: I. Internal kinematics of nine in-falling dEs

Galaxy environment has been shown to play an important role in transforming late-type, star-forming galaxies to quiescent spheroids. This transformation is expected to be more severe for low-mass galaxies ( $M \lt 10^{10}\, \mathrm{M}_\odot$ ) in dense galaxy groups and clusters, mostly due to the influence of their past host haloes (also known as

Bidaran, Bahar et al.

### Fecha de publicación:

7
2020
• The Fornax Deep Survey with VST. IX. Catalog of sources in the FDS area with an example study for globular clusters and background galaxies

Context. A possible pathway for understanding the events and the mechanisms involved in galaxy formation and evolution is an in-depth investigation of the galactic and inter-galactic fossil sub-structures with long dynamical timescales: stars in the field and in stellar clusters. Aims: This paper continues the Fornax Deep Survey (FDS) series

Cantiello, Michele et al.

### Fecha de publicación:

7
2020
• Disentangling the formation history of galaxies via population-orbit superposition: method validation

We present population-orbit superposition models for external galaxies based on Schwarzschild's orbit-superposition method, by tagging the orbits with age and metallicity. The models fit the density distributions, kinematic, and age and metallicity maps from integral field unit (IFU) spectroscopy observations. We validate the method and demonstrate

Zhu, Ling et al.

### Fecha de publicación:

6
2020
• Larger λ<SUB>R</SUB> in the disc of isolated active spiral galaxies than in their non-active twins

We present a comparison of the spin parameter λR, measured in a region dominated by the galaxy disc, between 20 pairs of nearby (0.005 < z < 0.03) seemingly isolated twin galaxies differing in nuclear activity. We find that 80-82% of the active galaxies show higher values of λR than their corresponding non-active twin(s), indicating larger

del Moral-Castro, I. et al.

### Fecha de publicación:

7
2020
• Quenching as a Contest between Galaxy Halos and Their Central Black Holes

Existing models of galaxy formation have not yet explained striking correlations between structure and star formation activity in galaxies, notably the sloped and moving boundaries that divide star-forming from quenched galaxies in key structural diagrams. This paper uses these and other relations to "reverse engineer" the quenching process for

Chen, Zhu et al.

### Fecha de publicación:

7
2020
• The Fornax Deep Survey with VST. VIII. Connecting the accretion history with the cluster density

Context. This work is based on deep multi-band (g, r, i) data from the Fornax Deep Survey with the VLT Survey Telescope (VST). We analyse the surface brightness profiles of the 19 bright early-type galaxies (ETGs; mB ≤ 15 mag) inside the virial radius of the Fornax cluster (Rvir ∼ 0.7 Mpc), in the mass range 8 × 108 ≤ M* ≤ 1.2 × 1011 M☉. Aims: The

Spavone, M. et al.

### Fecha de publicación:

7
2020
• The Fornax Deep Survey with the VST. IV. A size and magnitude limited catalog of dwarf galaxies in the area of the Fornax cluster (Corrigendum)
Venhola, Aku et al.

### Fecha de publicación:

6
2020
• The SAMI Galaxy Survey: Stellar Population Gradients of Central Galaxies

We examine the stellar population radial gradients (age, metallicity, and [α/Fe]) of 96 passive central galaxies up to ∼2 Re in the SAMI Galaxy Survey. The targeted groups have a halo mass range of $11\lt \mathrm{log}({M}_{200}/{M}_{\odot })\lt 15$ . The main goal of this work is to determine whether central galaxies have different stellar

Santucci, Giulia et al.

### Fecha de publicación:

6
2020
• The bivariate gas-stellar mass distributions and the mass functions of early- and late-type galaxies at z {∼} 0

We report the bivariate $HI$ - and $H2$ -stellar mass distributions of local galaxies in addition of an inventory of galaxy mass functions, MFs, for $HI$ , $H2$ , cold gas, and baryonic mass, separately into early- and late-type galaxies. The MFs are determined using the $HI$ and $H2$ conditional distributions and the galaxy stellar mass function

Rodríguez-Puebla, Aldo et al.

0
2020