284 citations · 2.7k across the 55 of their papers we have counts for
57 papers
Beyond the Disc--Spheroid Dichotomy at : Evidence for a Morphological Indeterminacy Regime from JWST
Igor Kolesnikov, Reinaldo Ramos de Carvalho, Jeong Hwan Lee +3
Galaxy morphology is a fundamental tracer of galaxy assembly, but its characterization becomes increasingly uncertain in the early Universe. We investigate morphological classifica…
The assembly of bulge-dominated galaxies: two evolutionary channels traced through morphology, kinematics, and environment with a hybrid classification pipeline
R. Flores-Freitas, R. R. de Carvalho, K. V. Nedkova +3
We investigate the physical origin of the bimodality in bulge-dominated galaxies, originally identified by Sampaio et al. (2025), by combining non-parametric morphological metrics,…
Satellite quenching and morphological transformation of galaxies in groups and clusters
M. Oxland, L. C. Parker, R. R. de Carvalho +1
We investigate the role that dense environments have on the quenching of star formation and the transformation of morphology for a sample of galaxies selected from the Sloan Digita…
Unveiling Galaxy Morphology through an Unsupervised-Supervised Hybrid Approach
I. Kolesnikov, V. M. Sampaio, R. R. de Carvalho +4
Galaxy morphology offers significant insights into the evolutionary pathways and underlying physics of galaxies. As astronomical data grows with surveys such as Euclid and Vera C.…
AstroInformatics: Recommendations for Global Cooperation
Ashish Mahabal, Pranav Sharma, Rana Adhikari +45
Policy Brief on "AstroInformatics, Recommendations for Global Collaboration", distilled from panel discussions during S20 Policy Webinar on Astroinformatics for Sustainable Develop…
Probing Stellar Populations and Interstellar Medium in Early-Type Central Galaxies
Vanessa Lorenzoni, Sandro B. Rembold, Reinaldo R. de Carvalho
In this study, we analyse the characteristics of stellar populations and the interstellar medium (ISM) in 15,107 early-type central galaxies from the SPIDER survey. Using optical s…
The co-evolution of strong AGN and central galaxies in different environments
V. M. Sampaio, A. Aragón-Salamanca, M. R. Merrifield +3
We exploit a sample of 80,000 SDSS central galaxies to investigate the effect of AGN feedback on their evolution. We trace the demographics of optically-selected AGN (Seyferts) as…
Exploring the stellar populations of backsplash galaxies
Ignacio Ferreras, Asmus Böhm, Keiichi Umetsu +2
Backsplash galaxies are those that traverse and overshoot cluster cores as they fall into these structures. They are affected by environment, and should stand out in contrast to th…
Quenching, bursting and galaxy shapes: colour transformation as a function of morphology
Camila de Sá-Freitas, Thiago Signorini Gonçalves, Reinaldo R. de Carvalho +6
Different mechanisms for quenching star formation in galaxies are commonly invoked in the literature, but the relative impact of each one at different cosmic epochs is still unknow…
SOAR/Goodman Spectroscopic Assessment of Candidate Counterparts of the LIGO-Virgo Event GW190814
Douglas Tucker, Matthew Wiesner, Sahar Allam +140
On 2019 August 14 at 21:10:39 UTC, the LIGO/Virgo Collaboration (LVC) detected a possible neutron star-black hole merger (NSBH), the first ever identified. An extensive search for…
The Gravity Collective: A Search for the Electromagnetic Counterpart to the Neutron Star-Black Hole Merger GW190814
Charles D. Kilpatrick, David A. Coulter, Iair Arcavi +79
We present optical follow-up imaging obtained with the Katzman Automatic Imaging Telescope, Las Cumbres Observatory Global Telescope Network, Nickel Telescope, Swope Telescope, and…
Morfometryka -- A New Way of Establishing Morphological Classification of Galaxies
Fabricio Ferrari, Reinaldo Ramos de Carvalho, Marina Trevisan
We present an extended morphometric system to automatically classify galaxies from astronomical images. The new system includes the original and modified versions of the CASGM coef…
SPIDER X - Environmental effects in central and satellite early-type galaxies through the stellar fossil record
F. La Barbera, A. Pasquali, I. Ferreras +3
A detailed analysis of how environment affects the star formation history of early-type galaxies (ETGs) is undertaken via high signal to noise ratio stacked spectra obtained from a…
SPIDER IX - Classifying Galaxy Groups according to their Velocity Distribution
A. L. B. Ribeiro, A. C. Schilling, R. R. de Carvalho +4
We introduce a new method to study the velocity distribution of galaxy systems, the Hellinger Distance (HD) - designed for detecting departures from a Gaussian velocity distributio…
SPIDER VIII - Constraints on the Stellar Initial Mass Function of Early-type Galaxies from a Variety of Spectral Features
F. La Barbera, I. Ferreras, A. Vazdekis +5
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 SDSS-based SPIDER survey. Clear…
SPIDER VII - Revealing the Stellar Population Content of Massive Early-type Galaxies out to 8Re
F. La Barbera, I. Ferreras, R. R. de Carvalho +4
Radial trends of stellar populations in galaxies provide a valuable tool to understand the mechanisms of galaxy growth. In this paper, we present the first comprehensive analysis o…
Systematic variation of the stellar Initial Mass Function with velocity dispersion in early-type galaxies
I. Ferreras, F. La Barbera, R. R. de Carvalho +4
An essential component of galaxy formation theory is the stellar initial mass function (IMF), that describes the parent distribution of stellar mass in star forming regions. We pre…
Constraints on feedback processes during the formation of early-type galaxies
Marina Trevisan, Ignacio Ferreras, Ignacio de la Rosa +2
Galaxies are found to obey scaling relations between a number of observables. These relations follow different trends at the low- and the high-mass ends. The processes driving the…
Characterizing the nature of Fossil Groups with XMM
F. La Barbera, M. Paolillo, E. De Filippis +1
We present an X-ray follow-up, based on XMM plus Chandra, of six Fossil Group (FG) candidates identified in our previous work using SDSS and RASS data. Four candidates (out of six)…
The link between the Star Formation History and [alpha/Fe]
Ignacio G. de la Rosa, Francesco La Barbera, Ignacio Ferreras +1
(Abridged) The abundance ratios between key elements such as iron and alpha-process elements carry a wealth of information on the star formation history (SFH) of galaxies. So far,…
On the Radial Stellar Content of Early-Type Galaxies as a Function of Mass and Environment
F. La Barbera, I. Ferreras, R. R. de Carvalho +4
Using optical-optical and optical-NIR colors, we analyze the radial dependence of age and metallicity inside massive (M* > 10^10.5 MSun), low-redshift (z<0.1), early-type galaxies…
SPIDER - V. Measuring Systematic Effects in Early-Type Galaxy Stellar Masses from Photometric SED Fitting
R. Swindle, R. R. Gal, F. La Barbera +1
We present robust statistical estimates of the accuracy of early-type galaxy stellar masses derived from spectral energy distribution (SED) fitting as functions of various empirica…
The Luminosity Function of the NoSOCS Galaxy Cluster Sample
E. De Filippis, M. Paolillo, G. Longo +3
We present the analysis of the luminosity function of a large sample of galaxy clusters from the Northern Sky Optical Cluster Survey, using latest data from the Sloan Digital Sky S…
Decision Tree Classifiers for Star/Galaxy Separation
E. C. Vasconcellos, R. R. de Carvalho, R. R. Gal +5
We study the star/galaxy classification efficiency of 13 different decision tree algorithms applied to photometric objects in the Sloan Digital Sky Survey Data Release Seven (SDSS…