A5034538529- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Remote Sensing in Agriculture
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Impact of Light on Environment and Health
- CCD and CMOS Imaging Sensors
- Advanced Vision and Imaging
- Plant Water Relations and Carbon Dynamics
- Cosmology and Gravitation Theories
- Calibration and Measurement Techniques
- Advanced Semiconductor Detectors and Materials
- Dark Matter and Cosmic Phenomena
- History and Developments in Astronomy
- Photocathodes and Microchannel Plates
- Diet, Metabolism, and Disease
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
Consejo Nacional de Investigaciones Científicas y Técnicas
2012-2023
National University of San Juan
2014-2023
Centro Científico Tecnológico - San Juan
2014-2016
Bernardino Rivadavia Natural Sciences Museum
2016
Instituto de Ciencias Astronómicas, de la Tierra y del Espacio
2012-2013
Argentine National Observatory
2011
Instituto de Astronomía Teórica y Experimental
2011
Universidad Nacional de Córdoba
2011
Context. The ESO public survey VISTA Variables in the Vía Láctea (VVV) surveyed inner Galactic bulge and adjacent southern disk from 2009–2015. Upon its conclusion, complementary VVV extended (VVVX) has expanded both temporal as well spatial coverage of original area, widening it 562 to 1700 sq. deg., providing additional epochs JHK s filters 2016–2023. Aims. With completion VVVX observations during first semester 2023, we present here observing strategy, a description data quality access,...
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...
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 interacting galaxy pairs with evidence of tidal features in the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7).The were selected within z < 0.1 by requiring a projected separation r p 50 h -1 kpc and relative radial velocity ∆V 500 km s .We complete spectroscopic using galaxies photometric redshifts considering phot 6800 , taking into account mean redshift uncertainty.We classify visual inspection spirals co-rotating counter-rotating systems.For subsample non-AGN galaxies,...
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...
Suzaku and Chandra X-ray observations detected a new cluster of galaxies, J1759-3450, at redshift z=0.13. It is located behind the Milky Way, high Galactic dust extinction renders it nearly invisible optical wavelengths. We attempt here to confirm galaxy with near-infrared imaging observations, characterize its central member galaxies. Images from VVV survey were used detect candidate galaxies J1759-3450 within region cluster, up 350 kpc peak emission. Color-magnitude color-color diagrams...
ABSTRACT We study the population of active galaxies in void environment Sloan Digital Sky Survey. use optical spectroscopic information to analyse characteristics emission lines galaxies, accomplished by WHAN and BPT diagrams. Also, we Wide-field Infrared Survey Explorer(WISE) mid-IR colours assess galactic nucleus (AGN) activity. investigate these different AGN classification schemes, both mid-IR, their dependence on spatial location with respect centres. To this end, define three regions:...
The ESO public survey VISTA Variables in the V\'ia L\'actea (VVV) surveyed inner Galactic bulge and adjacent southern disk from $2009-2015$. Upon its conclusion, complementary VVV eXtended (VVVX) has expanded both temporal as well spatial coverage of original area, widening it $562$ to $1700$ sq. deg., providing additional epochs $JHK_{\rm s}$ filters $2016-2023$. With completion VVVX observations during first semester 2023, we present here observing strategy, a description data quality...
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...
The main goal of this work is to investigate the influence environment at different scales on properties galaxies in systems with a low number members. To end we used catalogue small galaxy comprising compact and locally isolated pairs, triplets groups four up six galaxies. We consider fixed aperture estimators found that lower than 5 Mpc pairs are associated density environments groups. Moreover nearest neighbour approach highlights prefer denser slightly less dense When considering...
Aims: We present a statistical analysis of different characteristics ringed spiral galaxies with the aim assessing effects rings on disk galaxy properties. Methods: built catalog from Sloan Digital Sky Survey Data Release 14 (SDSS-DR14). Via visual inspection SDSS images, we classified face-on brighter than $g < 16.0$ mag into with: an inner ring, outer nuclear both and pseudo-ring. In addition to rings, recorded morphological types existence bars, lenses, pair companions or without...
Aims. With the aim of performing an analysis orientations galaxy pair systems with respect to underlying large-scale structure, we study alignment between axis connecting galaxies and host cosmic filament where resides. In addition, analyze dependence amplitude on morphology members as well properties. Methods. We build a catalog requiring $r_p < 100\kpc$ $\Delta V 500 \kms $ within redshift $z<0.1$ from Sloan Digital Sky Survey (SDSS). divided taking into account morphological...
We aim at defining homogeneous selection criteria of small galaxy systems in order to build catalogues suitable compare main properties pairs, triplets, and groups with four or more members. To this end we use spectroscopic photometric SDSS data identify a low number study global these the their member galaxies finding that are systematically redder lower star formation activity indicators than pairs which have higher fraction forming galaxies. Triplet present intermediate trends between...
Aims. With the aim of performing a suitable comparison internal process galactic bars with respect to external effect interactions on driving gas toward inner most region galaxies, we explored efficiency both mechanisms central nuclear activity in active nuclei (AGN) spiral galaxies. Methods. We selected samples barred AGN and objects residing pair systems, derived from Sloan Digital Sky Survey (SDSS). In order carry out reliable (AGNs hosts isolation galaxy pairs), galaxies similar...
We study the properties of a sample 3967 low-ionization nuclear emission-line region (LINER) galaxies selected from SDSS-DR7, with respect to their proximity galaxy groups. The host LINERs have been analysed and compared well-defined control 3841 non-LINER matched in redshift, luminosity, colour, morphology, age stellar mass content. find no difference between LINER terms colour population as function virial distance geometric centre group. However, we that are more likely populate...
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...
We perform a comparative study of AGNs in pairs, triplets and groups. To this end we use the Duplancic et al. catalogue small galaxy systems consider BPT WHAN diagnostic diagrams to select optical AGNs. Also identify mid-IR by using WISE data. performed comparison between different AGN classification methodologies fraction triplets, groups with four six members. also analyse main properties Optical hosts influence environment on active nuclei phenomena these systems. Our results show that,...
Context. The Ophiuchus cluster of galaxies, located at low latitudes in the direction Galactic bulge, has been relatively poorly studied comparison with other rich galaxy clusters, such as Coma, Virgo, and Fornax, despite being second brightest X-ray sky. Aims. Our aim is perform a study hidden population massive Zone Avoidance. Methods. Deep near-infrared images photometry from VISTA Variables Vía Láctea eXtended (VVVX) survey were used to detect member candidates up 2 Mpc cD 2MASX...
We studied a region of 1.636 square degrees corresponding to the VVV tile $b204$. Using SExtractor, we analysed photometric data generating catalogue extended sources in this area. In order confirm these as galaxy candidates visually inspected RGB images looking for typical features. 2MASX and GCMW catalogued tested completeness contamination our define suitable colour cuts select galaxies. also compared observational results with those obtained from two semi-analytical models on Dark Matter...
Here we analyze a sample of close galaxy pairs (relative projected separation < 25 h −1 kpc and relative radial velocities 350 km s ) using weak-lensing analysis based on the Canada-France-Hawaii Telescope Stripe 82 Survey (CS82). We determine halo masses for total as well interacting, red, higher-luminosity pair subsamples with ∼3 σ confidence. The derived lensing signal can be fitted either by Singular Isothermal Sphere (SIS) V = 223 ± 24 or Navarro–Frenk–White (NFW) profile R 200 0.30...
We analyse the properties of a sample 5560 LINER galaxies selected from SDSS-DR12 at low redshift, for complete range local density environments. The host were studied and compared with well-defined control 5553 non-LINER matched in red shift, luminosity, morphology density. By studying distributions galaxy colours stellar age population, we find that LINERs are redder older than over wide densities.In addition, sample, given colour, indicating some external process could have accelerated...
Context. The ZOA does not allow clear optical observations of extragalactic sources behind the Milky Way due to meaningful extinction emission these objects. in NIR wavelengths represent a potential source astronomical discoveries supporting detection new galaxies, completing picture large scale structure this still little explored area sky. Aims. Our aim is decipher nature overdensity located Way, tile b204 VVV survey. Methods. We studied an six arcmin around galaxy concentration at l =...
To unveil the influence of galaxy-galaxy interactions on material transport driven by galactic bars toward central regions active nucleus (AGN) galaxies, and to assess efficiency combined mechanisms in fueling massive black holes, we meticulously examine barred galaxies paired systems. Our study focuses AGN pairs with projected separations $r_ p \,kpc $ relative radial velocities V< 500 \,km within $z<0.1$, identified Sloan Digital Sky Survey (SDSS). quantify impact bars, also...
Aims: To unveil the influence of galaxy-galaxy interactions on material transport driven by galactic bars towards central regions active nuclei (AGN) galaxies and assess efficiency combined mechanisms in fueling massive black holes, we examine barred paired systems. Methods: Our study targets AGN pairs with projected separations $r_{p}< 100 \rm \,kpc \,h^{-1}$ relative radial velocities $\Delta V< 500 \,km \,s^{-1}$ within $z<0.1$, using Sloan Digital Sky Survey (SDSS) data. quantify impact...
Aims. We explore galaxies with ringed structures inhabiting poor and rich groups the aim of assessing effects local density environments on galaxy properties. Methods. identified inner, outer, nuclear, inner+outer (inner outer rings combined), partial that reside in by cross-correlating a sample group catalog obtained from Sloan Digital Sky Survey (SDSS). The resulting was divided based richness, having 3 ≤ N 10 members classified as poor, while 11 50 were rich. To quantify role environment...