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41 papers · 1 filter
Two kinematically distinct old globular cluster populations in the Large Magellanic Cloud
Andrés E. Piatti, Emilio J. Alfaro, Tristan Cantat-Gaudin
We report results of proper motions of 15 known Large Magellanic Cloud (LMC) old globular clusters (GCs) derived from the Gaia DR2 data sets. When these mean proper motions are gat…
Non-fiducial cosmological test from geometrical and dynamical distortions around voids
Carlos M. Correa, Dante J. Paz, Nelson D. Padilla +3
We present a new cosmological test using the distribution of galaxies around cosmic voids without assuming a fiducial cosmology. The test is based on a physical model for the void-…
Metallicity estimates of young clusters in the Magellanic Clouds from Stromgren photometry of supergiant stars
A. E. Piatti, G. Pietrzyński, W. Narloch +2
We present results obtained from Stromgren photometry of 13 young (~30-220 Myr) Magellanic Cloud (MC) clusters, most of them lacking in the literature from direct metallicity measu…
Structure and dynamics in low density regions: galaxy-galaxy correlations inside cosmic voids
Andrés N. Ruiz, Ignacio G. Alfaro, Diego Garcia Lambas
We compute the galaxy-galaxy correlation function of low-luminosity SDSS-DR7 galaxies inside cosmic voids identified in a volume limited s…
Search for a metallicity spread in the multiple population Large Magellanic Cloud cluster NGC 1978
Andrés E. Piatti, Jeremy Bailin
We report on the spread of [Fe/H] values in the massive Large Magellanic Cloud cluster NGC1978, recently confirmed to harbor multiple populations of nearly the same age. We used ac…
Machine Learning on Difference Image Analysis: A comparison of methods for transient detection
B. Sánchez, M. J. Domínguez R., M. Lares +12
We present a comparison of several Difference Image Analysis (DIA) techniques, in combination with Machine Learning (ML) algorithms, applied to the identification of optical transi…