A5025287571- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Remote Sensing in Agriculture
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Plant Water Relations and Carbon Dynamics
- Radio Astronomy Observations and Technology
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Advanced Image Processing Techniques
- Plant Reproductive Biology
- Electrical and Electromagnetic Research
- Material Science and Thermodynamics
- Science, Technology, and Education in Latin America
- Astrophysics and Cosmic Phenomena
- Space Technology and Applications
- Impact of Light on Environment and Health
- Advanced Fluorescence Microscopy Techniques
- Mexican Socioeconomic and Environmental Dynamics
Consejo Nacional de Investigaciones Científicas y Técnicas
2010-2024
Argentine National Observatory
2008-2024
Universidad Nacional de Córdoba
2006-2024
Instituto de Astronomía Teórica y Experimental
2010-2024
Centro Científico Tecnológico - San Juan
2016
Bernardino Rivadavia Natural Sciences Museum
2016
Museu de Astronomia e Ciências Afins
2011-2015
The Javalambre-Physics of the Accelerated Universe Astrophysical Survey (J-PAS) is a narrow band, very wide field Cosmological to be carried out from Javalambre Observatory in Spain with purpose-built, dedicated 2.5m telescope and 4.7 sq.deg. camera 1.2Gpix. Starting late 2015, J-PAS will observe 8500sq.deg. Northern Sky measure $0.003(1+z)$ photo-z for $9\times10^7$ LRG ELG galaxies plus several million QSOs, sampling an effective volume $\sim 14$ Gpc$^3$ up $z=1.3$ becoming first radial...
Compact groups (CGs) of galaxies are an extreme environment for the morphological transformations and cessation star formation in galaxies. However, despite initially being conceived as isolated systems, it is now widely recognised that many them not expected. Our objective to understand dynamics CGs, well how surrounding CGs impacts their physical properties. To achieve this, we selected a sample 316 Stripe 82 region, with total 1011 galaxies, 2281 field control sample. We find at least 41%...
We study galaxy pair samples selected from the Sloan Digital Sky Survey (SDSS-DR7) and we perform an analysis of minor major mergers with aim investigating dependence properties on interactions. build a catalog requiring rp < 25 kpc h-1 Delta V 350 km s-1 within redshift z<0.1. By visual inspection SDSS images removed false identifications classify interactions into three categories: pairs undergoing merging, M; evident tidal features, T; non disturbed, N. also divide sample according...
We present a catalogue of galaxy photometric redshifts and k-corrections for the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7), available on World Wide Web. The were estimated with an artificial neural network using five ugriz bands, concentration indices Petrosian radii in g r bands. have explored our redshift estimates different training sets, thus concluding that best choice improving accuracy comprises main sample (MGS), luminous red galaxies active galactic nuclei covering range 0...
The environment within dark matter haloes can quench the star formation of galaxies. However, environmental effects beyond virial radius ($\gtrsim$ 1 Mpc) are less evident. An example is debated correlation between colour or in central galaxies and neighbour adjacent at large separations several Mpc, referred to as two-halo galactic conformity. We use two galaxy catalogues generated from different versions semi-analytic model SAG applied MDPL2 cosmological simulation IllustrisTNG300...
In this paper, we use photometric data from the S-PLUS DR4 survey to identify isolated galaxy pairs and analyse their characteristics properties. Our results align with previous spectroscopic studies, particularly in luminosity function parameters, suggesting a consistent trait among systems. findings reveal high fraction of red galaxies across all samples, irrespective projected distance, velocity difference, or ratio. We found that proximity neighbour its central influences colour due...
We analyse optical and radio properties of galaxies detected in the Sloan Digital Sky Survey. The sample sources is selected from catalogue Kimball & Ivezić with flux densities at 325, 1400 4850 MHz, using Westerbork Northern Survey, NRAO VLA Survey Green Bank 6 cm surveys measurements 74 MHz taken Very Large Array Low-Frequency (Cohen et al. 2006). study galaxy spectral colour–colour diagrams find that our follows a single power law to MHz. index versus spectroscopic redshift relation not...
We present a new catalogue of galaxy triplets derived from the Sloan Digital Sky Survey (SDSS) Data Release 7. The identification systems was performed considering galaxies brighter than Mr=−20.5 and imposing constraints over projected distances, radial velocity differences neighbouring isolation. To improve triplets, we employed data pixelization scheme, which allows us to handle large amounts as in SDSS photometric survey. Using spectroscopic redshift range 0.01 ≤z≤ 0.40, obtain 5901...
We analyse a sample of 71 triplets luminous galaxies derived from the work O'Mill et al. (2012). compare properties and their members with those control samples compact groups, ten brightest rich clusters, in pairs. The are restricted to have spectroscopic redshifts range 0.01<z<0.14 Mr<-20.5. stellar mass (SM) content, star formation rates, Dn(4000) parameter colour index also different global these systems as total activity colours. calculate probability that strongly correlated. define...
We analyse a high-redshift sample (0.4 < z 0.5) of luminous red galaxies (LRGs) extracted from the Sloan Digital Sky Survey data release 4 and their surrounding structures to explore presence alignment effects these bright with neighbour objects. In order avoid projection effects, we compute photometric redshifts for within 3 h−1 Mpc in LRGs calculate relative angle between LRG major axis direction neighbours 1000 km s−1. find clear signal orientations distribution 1.5 Mpc. The are present...
We analyse the spatial configuration and dynamical properties of a sample 92 galaxy triplets obtained from SDSS-DR7 (SDSS-triplets) restricted to have members with spectroscopic redshifts in range $0.01\le z \le 0.14 $ absolute r-band luminosities brighter than $M_r=-20.5$. The analysis was performed through Agekyan & Anosova map (AA-map). estimated parameters, namely radius system, velocity dispersion, dimensionless crossing-time virial mass. compared our results those for catalogue...
According to the standard cosmological scenario, superclusters are objects that have just passed turn-around point and collapsing. The dynamics of very few been analysed up now. In this paper, we study supercluster SC0028-0005, at redshift 0.22, identify most prominent groups and/or clusters make supercluster, investigate dynamic state structure. For membership identification, used photometric spectroscopic data from Sloan Digital Sky Survey Data Release 10, finding six main structures in a...
We analyse $u-r$ colour distributions for several samples of galaxies in groups drawn from the Fourth Data Release Sloan Digital Sky Survey. For all luminosity ranges and environments considered are well described by sum two Gaussian functions. find that fraction red sequence is an increasing function group virial mass. also study evolution galaxy at low redshift, $z\le0.18$ field brighter than $M_r-5\log(h)=-20$, finding significant evidence recent population groups. The monotonically...
We use photometric redshifts to analyse the effect of local environment on galaxy colours at z≲ 0.63 in Sloan Digital Sky Survey (SDSS) data release 6 (DR6). construct mock SDSS-DR6 catalogues using semi-analytic galaxies study possible systematic effects characterization and colour statistics due uncertainty determination redshifts. projected density derived from distance nearest neighbours with a suitable radial velocity threshold take into account uncertainties redshift estimates. Our...
This is the second of a series papers on low X-ray luminosity galaxy clusters, in which we present r′, g′ and i′ photometry obtained with Gemini Multi-Object Spectrograph IMAGE at North South telescopes for seven systems redshift range 0.18 to 0.70. Optical magnitudes, colours morphological parameters, namely, concentration index, ellipticity visual classification, are also given. At lower redshifts, presence well-defined red cluster sequence extending by more than 4 mag showed that these...
Context. Studies of galaxy pairs can provide valuable information to jointly understand the formation and evolution galaxies groups. Consequently, taking into account new high precision photo-z surveys, it is important have reliable tested methods that allow us properly identify these systems estimate their total masses other properties. Aims. In view forthcoming Physics Accelerating Universe Survey (PAUS) we propose evaluate performance an identification algorithm projected close isolated...
ABSTRACT Galaxy pairs constitute the initial building blocks of galaxy evolution, which is driven through merger events and interactions. Thus, analysis these systems can be valuable in understanding evolution studying structure formation. In this work, we present a new publicly available catalogue close identified using photometric redshifts provided by Physics Accelerating Universe Survey (PAUS). To efficiently detect them, take advantage high-precision photo−z (σ68 &lt; 0.02) apply an...
We identify isolated galaxy triplets in a volume-limited sample from the Sloan Digital Sky Survey Data Release 10. Our final has 80 systems redshift range 0.04$\le$z$\le$0.1, brighter than $M_r = -20.5 + 5\log h_{70}$. Spectral synthesis results and WHAN BPT diagnostic diagrams were employed to classify galaxies these as star-forming, active nuclei, or passive/retired. suggest that brightest drive triplet evolution, evidenced by strong correlations between properties mass assembly mean...
In this work we present a lensing study of Compact Groups (CGs) using data obtained from the high-quality Canada–France–Hawaii Telescope Stripe 82 Survey. Using stacking techniques obtain average density contrast profile. We analyse signal dependence on groups’ surface brightness and morphological content, for CGs in redshift range |$z$| = 0.2–0.4. larger with higher brightness, probably due to their lower contamination by interlopers. Also, find strong group concentration parameter, most...
We investigate low-mass central galaxies with Mstar = $10^{9.5}-10^{10}$ Msun/h, located near massive groups and galaxy clusters using the TNG300 MDPL2-SAG simulations. set out to study their evolution, aiming find hints about large-scale conformity signal they produce. also use a control sample of far away from structures. For both samples, we sub-population that were accreted by another halo in past but are now considered galaxies; refer these objects as former satellites. The fraction...
Compact groups (CGs) of galaxies are extreme environments for morphological transformations and the cessation star formation. Our objective is to understand dynamics CGs how their surrounding environment impacts galaxy properties. We selected a sample 340 in Stripe 82 region, totaling 1083 galaxies, control 2281 field galaxies. find that at least 27\% our part major structures, i.e. non-isolated CGs. bimodality effective radius ($R_e$)-S\'ersic index ($n$) plane all transition (those with...
We investigated the population of low-mass central galaxies with M$_ star $ $h^ odot $, inhabiting regions near massive groups and clusters using IllustrisTNG300 MDPL2-SAG simulations. set out to study their evolutionary histories, aiming find hints about large-scale conformity signal they produce. also used a control sample same stellar mass range located far away from structures. For both samples, we subpopulation accreted by another halo in past, but now considered galaxies; refer these...
This is the fourth of a series papers on low X-ray luminosity galaxy clusters. The sample comprises 45 clusters with luminosities fainter than 0.7 10$^{44}$ erg s$^{-1}$ at redshifts lower 0.2 in regions Sloan Digital Sky Survey. spectroscopic members was obtained criteria: r$_p$ $\le$ 1 Mpc and $\Delta V \leq \sigma$ using our $\sigma$ estimates containing 21 more 6 members. We have also defined photometric galaxies that satisfy r$_p \le $ Mpc, 6000 \kms including cluster divided redshift...