A5057066406- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Spacecraft Design and Technology
- Isotope Analysis in Ecology
- Astrophysics and Cosmic Phenomena
- Genetic diversity and population structure
- Spectroscopy and Laser Applications
- Avian ecology and behavior
- Astrophysical Phenomena and Observations
- Liver Disease Diagnosis and Treatment
- Geophysics and Gravity Measurements
- Molecular Spectroscopy and Structure
Las Campanas Observatory
2024
Pontificia Universidad Católica de Chile
2015-2022
University of Northern British Columbia
2012
Library and Archives Canada
2012
Canadian Heritage
2012
Pontificia Universidad Católica del Ecuador
2012
University of Valparaíso
2008-2010
Valparaiso University
2009
European Southern Observatory
2006-2008
Cerro Tololo Inter-American Observatory
2005
We have obtained millimeter-wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 26 Spitzer-selected transition circumstellar disks. All our targets are located in the Ophiuchus molecular cloud (d ∼ 125 pc) spectral energy distributions (SEDs) suggesting presence inner opacity holes. use these ground-based data to estimate disk mass, multiplicity, accretion rate each object order investigate mechanisms potentially responsible...
Context. Giant Low Surface Brightness galaxies, such as Malin 1, host extended stellar and gaseous disks exceeding 100 kpc in radius. Their formation evolution remain debated, with interactions satellite galaxies accretion streams proposed key contributors. 1 has multiple satellites, including 1A, 1B, the newly reported 1C, along eM1 at 350 kpc. Additionally, it exhibits two giant streams, largest extending 200 kpc, likely linked to past interactions. Aims. We investigate orbital dynamics of...
<i>Aims. <i/> Our goal is to investigate the formation of star clusters in relatively unperturbed environments. To do this, we studied five nearby spiral galaxies: NGC 45, 1313, 4395, 5236, and 7793. <i>Methods. We obtained images galaxies their cluster systems using <i>Advanced Camera for Surveys (ACS)<i/> <i>Wide Field Planetary 2 (WFPC2)<i/> on board <i>Hubble Space Telescope<i/>. From a comparison broad-band colours with simple stellar population (SSP) models, derived individual...
ABSTRACT Clues to the formation and evolution of nuclear star clusters (NSCs) lie in their stellar populations. However, these structures are often very faint compared host galaxy, spectroscopic analysis NSCs is hampered by contamination light from rest system. With introduction wide-field integral field unit (IFU) spectrographs, new techniques have been developed model different components within galaxies, making it possible cleanly extract spectra study properties with minimal galaxy. This...
We present refined BVI light curves for six field RR Lyrae variable stars. The refinements include new data and improved photometric calibration compared to our previous work. For each star, we derive the intensity mean magnitudes, amplitudes, colors at minimum light. combine results with literature estimate dereddened color be (V - I)0,min = 0.58 ± 0.02 mag, a star‐to‐star scatter of 0.024 mag. Any dependence on metallicity is too weak formally detected available data. One stars exhibits...
ABSTRACT Many processes have been proposed to explain the quenching of star formation in spiral galaxies and their transformation into S0s. These affect bulge disc different ways, so by isolating spectra, we can look for these characteristic signatures. In this work, used buddi cleanly extract spectra bulges discs 78 S0 MaNGA Survey. We compared luminosity mass weighted stellar populations discs, finding that are generally older more metal rich than discs. When considering environment each...
Abstract We report on results from GBT/ARGUS 12 CO(1-0) observations for the giant low surface brightness galaxy Malin 1, which allow us to determine an upper limit its CO mass, and hence molecular gas mass density <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">Σ</mml:mi> </mml:mrow> mathvariant="normal">H</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> . Although we performed very deep through 17 hr...
We present results on the extra-tidal features of Milky Way globular cluster NGC 7099, using deep gr photometry obtained with Dark Energy Camera (DECam). reached nearly 6 mag below Main Sequence (MS) turnoff, so that we dealt most suitable candidates to trace any stellar structure located beyond tidal radius. From star-by-star reddening corrected color-magnitude diagrams (CMDs) defined four adjacent strips along MS, for which built respective density maps, once contamination by field stars...
Context.Star clusters are present in almost all types of galaxies. Here we investigate the star cluster population low-luminosity, unperturbed spiral galaxy NGC 45, which is located nearby Sculptor group. Both old (globular) and young star-cluster populations studied.
Context. Extragalactic globular clusters have been studied in elliptical galaxies and a few luminous spiral galaxies, but little is known about low-luminosity spirals.
Nearby merging pairs are unique laboratories in which one can study the gravitational effects on individual interacting components. In this manuscript, we report characterization of selected HII regions along peculiar galaxy NGC 2936, member pair Arp 142, an E+S interaction, known as "The Penguin". Using Gemini South spectroscopy have derived a high enhancement global star formation rate SFR=35.9 Msun/yr probably stimulated by interaction. Star-forming display oxygen abundances that...
In the framework of Local Group Census (LGC), a survey (LG) galaxies above Dec=$-30^\circ$, which is aimed at surveying their populations with strong emission lines, we have searched for planetary nebulae (PNe) in low-metallicity dwarf irregular IC1613, WLM, GR8. Two new candidate PNe been found one WLM and none The observations presented this paper, together previous results from LGC, represent first step study PN population low-metallicity, Group. They will be followed by deep spectroscopy...
We have derived from VIMOS spectroscopy the radial velocities for a sample of 71 stars selected CFHT/Megacam photometry around Galactic globular cluster NGC7492. In resulting velocity distribution, it is possible to distinguish two relevant non-Galactic kinematic components along same line sight: group at $\langle{v_{\rm r}}\rangle \sim 125$km s$^{-1}$ which compatible with old leading arm Sagittarius tidal stream, and larger number objects -110$km that might be identified as members...
Gas-rich galaxies in dense environments such as galaxy clusters and massive groups are affected by a number of possible types interactions with the cluster environment, which make their evolution radically different than that field galaxies. The dIrr NGC 1427A, presently infalling towards core Fornax cluster, offers unique opportunity to study those processes level detail not achieve for at higher redshifts. Using HST/ACS auxiliary VLT/FORS ground-based observations, we properties most...
We study the outer regions of Milky Way globular cluster NGC6981 from publicly available $BV$ photometry and new Dark Energy Camera (DECam) observations, both reaching nearly 4 mag below main sequence (MS) turnoff. While data sets reveal present extra-tidal features around cluster, much larger field view DECam observations allowed us to identify some other tidal features, which extend toward opposite direction center. These structural arise stellar density maps built using MS stars, once...
Context . The Large Magellanic Cloud (LMC) is known to be the host of a rich variety star clusters all ages. A large number them seen in close projected proximity. Ages have been derived for few showing differences up million years, hinting at being binary clusters. However, final confirmation through spectroscopy measurements and dynamical analysis needed. Aims In present work we focus on one these LMC cluster pairs (NGC 2006–SL 538) aim determine whether pair bound entity and, therefore,...
We study the properties of one most luminous hinge clumps, located on compact group galaxies NGC6845. Using IFS from GMOS/Gemini, complemented with archival MUSE data, we obtain oxygen abundances, ages, star formation rates, velocity fields and also performed a single stellar populations modeling to understand SFH clump localized in found that sits tail, having SFR 3.4$M_{\odot}yr^{-1}$, which is comparable few other extreme cases, e.g., clusters Antennae galaxy reported clumps literature....
Context. Compact groups of galaxies are unique places where galaxy-galaxy interactions play a mayor role on the evolution its members. These strong gravitational encounters can induce star formation bursts. Aims. We study properties one most luminous so-called hinge clumps that is located in compact group NGC 6845. Methods. Using integral field spectroscopy from GMOS/Gemini complemented with archival MUSE data, we obtained oxygen abundances, ages, rates, and velocity fields, also modeled...