A5070526974- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astronomical and nuclear sciences
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Transition Metal Oxide Nanomaterials
- Cloud Computing and Resource Management
- Spectroscopy and Laser Applications
- Archaeological and Historical Studies
- Solid-state spectroscopy and crystallography
- Sympathectomy and Hyperhidrosis Treatments
- Non-Destructive Testing Techniques
- Efficiency Analysis Using DEA
- SAS software applications and methods
- Data Mining Algorithms and Applications
- Adolescent Sexual and Reproductive Health
- Vehicle Routing Optimization Methods
- Healthcare during COVID-19 Pandemic
- Pigment Synthesis and Properties
Universidad Andrés Bello
2018-2024
University of Minho
2024
Stanford University
2024
University of Tarapacá
2020-2023
Polytechnic Institute of Porto
2022
European Southern Observatory
2013-2020
Millennium Institute of Astrophysics
2019-2020
Universidade Federal do Amazonas
2018
Universidade de São Paulo
2008-2016
Durham University
2015-2016
Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started 2010. VVV targets 562 sq. deg Galactic bulge and an adjacent plane region is expected to run for about five years.
VISTA Variables in the V\'{\i}a L\'actea (VVV) is one of six ESO Public Surveys operating on new 4-meter Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV scanning Milky Way bulge an adjacent section disk, where star formation activity high. One principal goals to find clusters different ages. In order trace early epochs cluster we concentrated our search directions those known regions, masers, radio, infrared sources. The disk area covered by was visually inspected using...
Abstract It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the bulge. High stellar density combined with high and differential interstellar reddening are two major problems for finding located We use deep near-IR photometry VISTA Variables in Vía Láctea (VVV) Survey search projected bulge, hereby report discovery 22 new candidate clusters. These objects, detected as regions our maps bulge red giants, confirmed cluster candidates by their...
(ABRIDGED) Globular clusters trace the formation and evolution of Milky Way surrounding galaxies, outline their chemical enrichment history. To accomplish these tasks it is important to have large samples with homogeneous data analysis derive kinematics, abundances, ages locations. We obtain metallicities alpha-element enhancement for over 800 red giant stars in 51 Galactic bulge, disc, halo globular that are among most distant and/or highly reddened Galaxy's cluster system. observed R ~...
Abstract We present the Sloan Digital Sky Survey V Local Volume Mapper (LVM). The LVM is an integral-field spectroscopic survey of Milky Way, Magellanic Clouds, and a sample local volume galaxies, connecting resolved parsec-scale individual sources feedback to kiloparsec-scale ionized interstellar medium (ISM) properties. 4 yr covers southern Way disk at spatial resolutions 0.05–1 pc, Clouds 10 pc resolution, nearby large galaxies larger scales totaling >4300 deg 2 sky more than 55M...
Context. The Milky Way (MW) bulge is a fundamental Galactic component for understanding the formation and evolution of galaxies, in particular our own. ESO Public Survey VISTA Variables Vía Láctea deep near-IR survey mapping southern plane. Particularly area, VVV covering ~315 deg2. Data taken during 2010 2011 covered entire area JHKs bands.
We use deep multi-epoch near-IR images of the VISTA Variables in V\'ia L\'actea (VVV) Survey to search for RR Lyrae stars towards Southern Galactic plane. Here we report discovery a group close together VVV tile d025. Inspection and PSF photometry reveals that most these are likely belong globular cluster, matches position previously known star cluster FSR\,1716. The stellar density map field yields $>100$ sigma detection this candidate is centered at equatorial coordinates...
We present a catalog of star clusters, associations and related extended objects in the Small Magellanic Cloud Bridge with 2741 entries, factor 2 more than previous version from decade ago. Literature data till December 2018 are included. The identification clusters was carried out digital atlases various bands currently available DSS MAMA imaging surveys. In particular, we cross-identified recent cluster samples VMC, OGLE-IV SMASH surveys, confirming new pointing equivalencies. A major...
The structure of the Small Magellanic Cloud (SMC) is very complex, in particular periphery that suffers more from interactions with Large (LMC). A wealth observational evidence has been accumulated revealing tidal tails and bridges made up gas, stars star clusters. Nevertheless, a full picture SMC outskirts only recently starting to emerge 6D phase-space map plus age metallicity using clusters as tracers. In this work, we continue our analysis another outer region SMC, so-called West Halo,...
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,...
HP$\,$1 is an $\alpha$-enhanced and moderately metal-poor bulge globular cluster with a blue horizontal branch. These combined characteristics make it probable relic of the early star formation in innermost Galactic regions. Here we present detailed analysis deep near-infrared (NIR) photometry obtained NIR GSAOI+GeMS camera at Gemini-South telescope. $J$ $K_{\rm S}$ images were collected exquisite spatial resolution (FWHM $\sim 0.1$ arcsec), reaching stars two magnitudes below MSTO. We...
Red clump stars are commonly used to map the reddening and morphology of inner regions Milky Way. We use new photometric catalogues VISTA Variables in V\'ia L\'actea survey achieve twice spatial resolution previous maps for Galactic longitudes $-10^{\circ}<l<10^{\circ}$ latitudes $-1.5^{\circ}<b<1.5^{\circ}$. these de-reddened construct $K_{s}$ luminosity function around red plane. show that secondary peak (fainter than clump) detected does not correspond bulge red-giant branch bump alone,...
The globular cluster HP~1 is projected at only 3.33 degrees from the Galactic center. Together with its distance, this makes it one of most central clusters in Milky Way. It has a blue horizontal branch (BHB) and metallicity [Fe/H]~-1.0. This means that probably oldest objects Galaxy. Abundance ratios can reveal nucleosynthesis pattern first stars as well early chemical enrichment formation stellar populations. High-resolution spectra obtained for six were analyzed to derive abundances light...
In order to characterize 22 new globular cluster (GC) candidates in the Galactic bulge, we present their colour–magnitude diagrams (CMDs) and Ks-band luminosity functions (LFs) using near-infrared VVV database as well Gaia-DR2 proper motion data set. CMDs were obtained, on one hand, after properly decontaminating observed from background/foreground disc stars other sources. On also obtained based upon star selection diagrams. Taking into account our deep LFs analyses, find that 17 out of GC...
Context. Galactic Globular Clusters (GCs) are essential tools to understand the earliest epoch of Milky Way, since they among oldest objects in Universe and can be used trace its formation evolution. Current studies using high resolution spectroscopy for many stars each a large sample GCs allow us develop detailed observational picture about their relation with Galaxy. However, it is necessary complete this by including that belong all major components, Bulge. Aims. Our aim perform chemical...
The Bulge Globular Clusters (GCs) are key tracers of this central ancient component our Galaxy. It is essential to understand their formation and evolution study that the bulge, as well relationship with other Galactic GC systems (halo disk GCs). Our main goals obtain detailed abundances for a sample seven red giant members NGC 6528 in order characterize its chemical composition halo GCs. Moreover, we analyze cluster$'$s behavior associated Multiple Populations (MPs) phenomenon. We obtained...
The VISCACHA (VIsible Soar photometry of star Clusters in tApii and Coxi HuguA) Survey is an ongoing project based on deep photometric observations Magellanic Cloud clusters, collected using the SOuthern Astrophysical Research (SOAR) telescope together with SOAR Adaptive Module Imager. Since 2015 more than 200 h time were used to observe about 130 stellar most them low mass (M < 104 M⊙) and/or located outermost regions Large Small Cloud. With this high-quality data set, we homogeneously...
(ABRIDGED) The evolution and structure of the Magellanic Clouds is presently under debate. classical scenario where both Large Small (LMC, SMC) are orbiting Milky Way has been challenged by an alternative LMC SMC in their first close passage to our Galaxy. Detailed studies stellar populations galaxies should constrain proposed scenarios. In particular, west halo was recently characterized with radial trends age metallicity which indicates tidal disruption. We increase sample star clusters...
Context. Stellar clusters in the Small Magellanic Cloud (SMC) are useful probes for studying chemical and dynamical evolution of this neighbouring dwarf galaxy, enabling inspection a large period covering over 10 Gyr. Aims: The main goals work derivation age, metallicity, distance modulus, reddening, core radius, central density profiles six sample clusters, order to place them context evolution. studied AM 3, HW 1, 34, 40, Lindsay 2, 3; 2 first time. Methods: Optical colour-magnitude...
Although the globular clusters in Milky Way have been studied for a long time, significant fraction of them lack homogeneous metallicity and radial velocity measurements. In an earlier paper we presented first part project to obtain metallicities velocities Galactic from multiobject spectroscopy their member stars using ESO Very Large Telescope. this add new sample 28 clusters, including particular MW halo bulge. Together with our previous results, study brings number measurements ∼69% those...
Milky Way globular clusters (MW GCs) are difficult to identify at low Galactic latitudes because of high differential extinction and heavy star crowding. The new deep near-IR images photometry from the VISTA Variables in Via L\'actea Extended Survey (VVVX) allow us chart previously unexplored regions. Our long term aim is complete census MW GCs. immediate goals estimate astrophysical parameters, measuring their reddenings, extinctions, distances, total luminosities, proper motions, sizes,...
Context. The interactions between the Small and Large Magellanic Clouds (SMC LMC) created Bridge; a stream of gas stars pulled out SMC towards LMC about 150 Myr ago. tidal counterpart this structure, which should include trailing arm, has been predicted by models but no compelling observational evidence confirmed Counter-Bridge so far. Aims. main goal work is to find stellar Bridge Counter-Bridge. We use star clusters in outskirts as they provide 6D phase-space vector, age, metallicity help...