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Our results have been published in high-impact journals, and I have also presented my key findings at numerous scientific events.
Our results have been published in high-impact journals, and I have also presented my key findings at numerous scientific events.
Here you can find the list of my papers in ADS
Publications:
Publications:
Disks no more: the morphology of low-mass simulated galaxies in FIREbox
Disks no more: the morphology of low-mass simulated galaxies in FIREbox
Benavides, J. et al. 2025
We study the morphology of simulated central galaxies from the FIREbox simulation. We show that burstiness in the star formation history and the deepening of the gravitational potential strongly correlate in our simulations with this transition regime, with disks forming in objects with lower levels of burstiness in the last ~ 6 Gyr and halos with mass ~ 10^11 Msun and above. This study highlights dwarf morphology as a fundamental benchmark for testing future galaxy formation models.
The Environmental Quenching Mechanisms of Field Dwarf Galaxies
The Environmental Quenching Mechanisms of Field Dwarf Galaxies
Benavides, J. et al. 2025
We use the TNG50 simulation to investigate their origin and find that they all result from environmental effects that have removed or reduced their gas content. Quenched field dwarfs consist of either backsplash objects ejected from a massive host or of systems that have lost their gas after crossing overdense regions such as filaments or sheets (“cosmic web stripping”)
Large dark matter content and steep metallicity profile predicted for Ultra-Diffuse Galaxies formed in high-spin halos
Large dark matter content and steep metallicity profile predicted for Ultra-Diffuse Galaxies formed in high-spin halos
Benavides, J. et al. 2024
We study the stellar properties of a sample of simulated ultra-diffuse galaxies (UDGs). Our results indicate that this sample of UDGs is metal-poor compared to non-UDGs, exhibiting steep metallicity profiles. The UDGs in TNG50 were formed within massive dark matter halos.
Origin and evolution of ultra-diffuse galaxies in different environments
Origin and evolution of ultra-diffuse galaxies in different environments
Benavides, J. et al. 2023
We define ultra-diffuse galaxies (UDGs) as dwarf galaxies in the stellar mass range 7.5≤log(Mstar/M⊙)≤9 that are in the 5 percent most extended tail of the simulated mass-size relation. We show how UDGs preferentially form in dark matter haloes with high angular momentum.
Quiescent ultra-diffuse galaxies in the field originating from backsplash orbits
Quiescent ultra-diffuse galaxies in the field originating from backsplash orbits
Benavides, J. et al. 2021
It is well known that ultra-diffuse galaxies (UDGs) are typically red and quiescent in groups and clusters, while their counterparts in the field are blue and star-forming. However, in recent years, a peculiar population of quenched isolated UDGs has been observed. We demonstrate how these isolated quenched ultra-diffuse galaxies in the field form after being ejected from their host halos.
DS+: A method for the identification of cluster substructures
DS+: A method for the identification of cluster substructures
Benavides, J. et al. 2023
The study of cluster substructures is important for the determination of the cluster dynamical status, assembly history, and the evolution of cluster galaxies, and it allows us to set constraints on the nature of dark matter and cosmological parameters. We develop a method (DS+) to identify and characterize substructures in galaxy clusters. A free version of our method written in python is available on GitHub
We study the role of group infall in the assembly and dynamics of galaxy clusters in ΛCDM. We show how galaxy clusters are formed by the accretion of individual galaxies and groups, and how these falling groups can generate suitable environments for mergers between galaxies within the clusters.
The galaxy-halo connection of disc galaxies over six orders of magnitude in stellar mass
The galaxy-halo connection of disc galaxies over six orders of magnitude in stellar mass
Mancera Piña , P. + Benavides, J. et al. 2025
In this paper, we assemble a sample of 49 nearby gas-rich dwarf and massive disc galaxies with unmatched ancillary data. We obtain their gas kinematics and derive their dark matter properties through rotation curve decomposition. Our sample is representative of the regularly rotating gas-rich galaxy population and allowed us to study the galaxy-halo connection across nearly six orders of magnitude in Mstar. We find that the Mgas − M200 relation rises monotonically, with galaxies having around 4% of the average cosmological baryon fraction in cold gas.
A physically motivated galaxy size definition across different state-of-the-art hydrodynamical simulations
A physically motivated galaxy size definition across different state-of-the-art hydrodynamical simulations
Arjona-Gálvez , E. + Benavides, J. et al. 2025
Recent observational studies have introduced a new, physically motivated definition for determining galaxy sizes. In practice, a proxy for measuring this position in the present-day universe is the radial position of the stellar mass density contour at 1 Msun/pc^-2, defined as R1. In this study, we aim to test the validity of this new definition and assess its consistency across different redshifts and galaxy formation models. Furthermore, we explore the connection between a galaxy's total mass within R1 and its stellar mass, finding very little scatter in this relation. This suggests that R1 could serve as a reliable observational tracer for a galaxy's dynamical mass.
Effects of galactic environment on size and dark matter content in low-mass galaxies
Effects of galactic environment on size and dark matter content in low-mass galaxies
Mercado , F. + Benavides, J. et al. 2025
We utilize the cosmological volume simulation, FIREbox, to investigate how a galaxy’s environment influences its size and dark matter content. At fixed stellar mass, we find that galaxies experiencing stronger tidal influences, indicated by higher Perturbation Indices (PI>1) are generally larger and have lower halo masses relative to their counterparts with lower Perturbation Indices (PI<1). Our results highlight a critical interplay between environmental factors and halo mass in shaping galaxy properties, affirming the environment as a fundamental driver in galaxy formation and evolution.
Boosting the evolutionary picture of galaxy clusters: a case study at intermediate-redshift of Cl 0024+17 and MS 0451−03
Boosting the evolutionary picture of galaxy clusters: a case study at intermediate-redshift of Cl 0024+17 and MS 0451−03
Costa, A. + Benavides, J. et al. 2024
We improve the dynamic-evolutionary framework of two massive clusters at intermediate redshifts: Cl 0024+17 at z ~ 0.4 and MS 0451-03 at z ~ 0.5. The spectroscopic galaxy members were selected from Moran et al. (2007a), which combine optical and UV imaging with spectroscopy. Using a set of dynamic estimators with different approaches, our results show that both Cl 0024+17 and MS 0451-03 are non-relaxed systems with distinct dynamical configurations.
Size-mass relations for simulated low-mass galaxies: mock imaging versus intrinsic properties
Size-mass relations for simulated low-mass galaxies: mock imaging versus intrinsic properties
Klein, C. + Benavides, J. et al. 2024
We analyze the mass-size relation of mock images, using simulated galaxies from the FIRE project. If our simulations are accurate representations of the real Universe, then the relationship between galaxy size and stellar mass is even tighter for low-mass galaxies than is commonly inferred from observed relations.
RMS asymmetry: a robust metric of galaxy shapes in images with varied depth and resolution
RMS asymmetry: a robust metric of galaxy shapes in images with varied depth and resolution
Sazonova, E. + Benavides, J. et al. 2024
Here we study the structural disturbances, such as galaxy mergers or instabilities, are key candidates for driving galaxy evolution, so it is important to detect and quantify galaxies hosting these disturbances spanning a range of masses, environments, and cosmic times
Imposters among us: globular cluster kinematics and the halo mass of ultra-diffuse galaxies in clusters
Imposters among us: globular cluster kinematics and the halo mass of ultra-diffuse galaxies in clusters
Doppel, J. + Benavides, J. et al. 2024
Here we study the velocity dispersion of globular clusters (GCs) around ultra-diffuse galaxies (UDGs) in the Virgo cluster spans a wide range, including cases where GC kinematics suggest haloes as massive as (or even more massive than) that of the Milky Way around these faint dwarfs.
Attenuation proxy hidden in surface brightness - colour diagrams. A new strategy for the LSST era
Attenuation proxy hidden in surface brightness - colour diagrams. A new strategy for the LSST era
Małek, K. + Benavides, J. et al. 2024
Large future sky surveys, such as the Legacy Survey of Space and Time (LSST), will provide optical photometry for billions of objects. This paper aims to construct a proxy for the far-UV (FUV) attenuation (AFUVp) from the optical data alone, enabling the rapid estimation of the star formation rate (SFR) for galaxies that lack UV or IR data.
Preparing for low surface brightness science with the Vera C. Rubin Observatory: Characterization of tidal features from mock images
Preparing for low surface brightness science with the Vera C. Rubin Observatory: Characterization of tidal features from mock images
Martin, G.+ Benavides, J. et al. 2022
Utilizing automated techniques and human visual classification in conjunction with realistic mock images produced using the NEWHORIZON cosmological simulation, we investigate the nature, frequency, and visibility of tidal features and debris across a range of environments and stellar masses.
A unified scenario for the origin of spiral and elliptical galaxy structural scaling laws
A unified scenario for the origin of spiral and elliptical galaxy structural scaling laws
Ferrero, I.+ Benavides, J. et al. 2021
We use Lambda cold dark matter (ΛCDM) cosmological hydrodynamical simulations to show that the scaling relations of both ellipticals and spirals arise as the result of (i) a tight galaxy mass-dark halo mass relation and (ii) the self-similar mass profile of cold dark matter halos.
Conferences and ArXiv:
Conferences and ArXiv:
Benavides, J., Navarro J, & Sales, L. (2024). Mind the Gap: Galaxies and Large-Scale Structure. Córdoba, Argentina. Oral presentation.
Benavides, J., Navarro J, & Sales, L. (2024). VIII Congreso Colombiano de Astronomía (COCOA). Universidad Industrial de Santander, Bucaramanga-Colombia. Oral presentation.
Benavides, J., Sales, L., Moreno, J., Bullock, J., Wetzel, F., A. Mercado, & Feldmann, R. (2024). Galaxy Formation Evolution in Southern California (GalFRESCA) meeting. Pasadena-California, USA. Oral contribution.
Benavides, J., Sales, L., & Abadi, M. (2024). Workshop: Dwarf Galaxies, Star Clusters, and Streams in the LSST Era. Chicago, USA. Poster presentation.
Benavides, J., Sales, L., & Abadi, M. (2024). Latin American Conference on Astrophysics and Relativity. Bogotá, Colombia. Oral presentation.
Benavides, J., Sales, L., & Abadi, M. (2023). 4th Regional Extragalactic Astronomy Meeting: 60 Years Of The Sersic Law. Córdoba, Argentina. Oral presentation.
Benavides, J., Sales, L., & Abadi, M. (2023). XVII Latin American Regional IAU Meeting. Montevideo, Uruguay. Oral presentation.
Benavides, J., & Sales, L. (2023). Galaxy Formation Evolution in Southern California (GalFRESCA) meeting. Riverside-California, USA. Oral presentation.
Celiz, B. M., Benavides, J. A., & Abadi, M. G. (2023). Formación de grupos compactos de galaxias en simulaciones cosmológicas hidrodinámicas. (Vol. 64, pp. 229–231).
Benavides, J., Abadi, M., & Sales, L. (2022a). 64 a Reunión Anual de la Asociación Argentina de Astronomía. Buenos Aires, Argentina. Oral presentation.
Benavides, J. A., Abadi, M. G., & Sales, L. V. (2022). El origen de las galaxias Ultra-Difusas apagadas en el campo. (Vol. 63, pp. 208–210).
Benavides, J., Abadi, M., & Sales, L. (2022b). Special Seminar, hosted by the Galaxy Clusters group. Institute for Fundamental Physics of the Universe (IFPU), Trieste-Italy. Oral presentation.
Benavides, J., Abadi, M., & Sales, L. (2022c). XI Friends of Friends Meeting – Linking astronomy and friends in Virtual Córdoba. Universidad Nacional de Córdoba, Córdoba-Argentina. Oral presentation.
Benavides, Jose A., Chalela, M., Cabral, J. B., Sánchez, B. O., & Gurovich, S. (2021). SCORPIO, a package for the visualization of galaxy pairs. (arXiv:2111.01260). arXiv: 2111.01260 [astro-ph.IM]
Benavides, J., Abadi, M., & Sales, L. (2021). 63 a Reunión Anual de la Asociación Argentina de Astronomía. Córdoba, Argentina. Oral presentation.
Benavides, J. A., & Abadi, M. G. (2021). Ensamblaje de cúmulos de galaxias por eventos de acreción de grupos de galaxias. (Vol. 62, pp. 171–173).
Daza, I., Alfaro, I. G., Benavides, J. A., Lares, M., Santucho, M. V., Cabral, J. B., . . . Koraj, M. (2021). PISCIS: Platform for Interactive Search and Citizen Science. (Vol. 62, pp. 310–312).
Benavides, J., & Abadi, M. (2021). X Friends of Friends Meeting – Linking astronomy and friends in Virtual Córdoba. Universidad Nacional de Córdoba, Córdoba-Argentina. Oral presentation.
Benavides, J. (2020). Salón de la Ciencia 2020. Divulgando la Ciencia desde Casa. Universidad Pedagógica Nacional, Bogotá-Colombia. Oral presentation.
Benavides, J., & Abadi, M. (2020). 62 a Reunión Anual de la Asociación Argentina de Astronomía. Rosario, Argentina. Oral presentation.
Benavides, J., & Casas-Miranda, R. A. (2018). Infall of Associations of Dwarf Galaxies into the Milky Way Halo. (Vol. 50, pp. 13–14).
Benavides, J., & Bohórquez, O. (2017). V Congreso Colombiano de Astronomía (COCOA). Universidad Tecnológica de Pereira, Risaralda-Colombia. Oral presentation.
Benavides, J. (2017a). VII Astronomía Dinámica en Latinoamérica. Universidad de los Andes, Bogotá-Colombia.Oral presentation.
Benavides, J. (2017b). Encuentro Latinoamericano eCiencia. San Jose-Costa Rica. Oral presentation.
Benavides, J., & Casas-Miranda, R. A. (2016). XV Latin American Regional IAU Meeting. Cartagena de Indias, Colombia. Poster presentation.
Benavides, J. (2016). “Diálogo hacia una formación integral en ciencias”. Universidad Antonio Nariño, Bogotá-Colombia. Organizing Committee and participant.
Benavides, J., & Bohórquez, O. (2015). XXVI Congreso Nacional de Física. Universidad del Nacional de Colombia, Manizales-Colombia. Oral presentation.
Benavides, J. (2015). Segundo Workshop de Astronomia en los Andes. Universidad de los Andes, Bogotá-Colombia. Poster presentation.
Benavides, J. (2014a). I Escuela Andina de Astronomía y Astrofísica. Quito-Ecuador. Oral presentation.
Benavides, J. (2014b). IV Congreso Colombiano de Astronomía (COCOA). Universidad de Nariño, Pasto-Colombia. Poster presentation.
Benavides, J. (2013). XXV Congreso Nacional de Física. Universidad del Quindío, Quindío-Colombia. Poster presentation.
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