A5058685879- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Space Exploration and Technology
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- High-pressure geophysics and materials
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Spacecraft and Cryogenic Technologies
- Inertial Sensor and Navigation
- Radio Astronomy Observations and Technology
- Advanced Measurement and Metrology Techniques
- Scientific Research and Discoveries
Millennium Institute of Astrophysics
2016-2025
Adolfo Ibáñez University
2019-2025
Data Observatory Foundation
2022-2025
Obstech (Chile)
2016-2023
Pontificia Universidad Católica de Chile
2011-2020
Max Planck Institute for Astronomy
2008-2020
NASA Exoplanet Science Institute
2019
Max Planck Society
2018-2019
Cooperative Institute for Research in Environmental Sciences
2019
Instituto Profesional Providencia
2018
The ACS Virgo Cluster Survey consists of HST imaging for 100 early-type galaxies in the Cluster, observed F475W and F850LP filters. We derive distances 84 these using method surface brightness fluctuations (SBFs), present SBF distance catalog, use this database to examine three-dimensional distribution Cluster. moduli have a mean (random) measurement error 0.07 mag (0.5 Mpc), or roughly 3 times better than previous measurements galaxies. Five lie at ~23 Mpc are members W' cloud. remaining 79...
We present a detailed analysis of the morphology, isophotal parameters, and surface brightness profiles for 100 early-type members Virgo Cluster, from dwarfs (MB = -15.1 mag) to giants -21.8 mag), imaged in g z passbands using Advanced Camera Surveys on board Hubble Space Telescope. Dust complex morphological structures are common. is detected 42% galaxies brighter than BT 12.15 mag, while kiloparsec-scale stellar disk, bars, nuclear disks seen 60% with intermediate luminosity. Isophotal...
The ACS Virgo Cluster Survey is a Hubble Space Telescope program to obtain high-resolution imaging in widely separated bandpasses (F475W ≈ g and F850LP z) for 100 early-type members of the Cluster, spanning range ≈460 blue luminosity. We use this large, homogenous data set examine innermost structure these galaxies characterize properties their compact central nuclei. present sharp upward revision frequency nucleation brighter than MB -15 (66% ≲ fn 82%) show that ground-based surveys...
We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains largest number homogeneously observed reduced nearby SNe Ia (z ≲ 0.08) published to date. It more than doubles sample, bringing SN cosmology point where systematic uncertainties dominate. Our natural system has a precision ≲0.02 mag in BVRIr'i' ≲0.04...
ABSTRACT The Next Generation Virgo Cluster Survey (NGVS) is a program that uses the 1 deg 2 MegaCam instrument on Canada–France–Hawaii Telescope to carry out comprehensive optical imaging survey of cluster, from its core virial radius—covering total area 104 —in u * griz bandpasses. Thanks dedicated data acquisition strategy and processing pipeline, NGVS reaches point-source depth g ≈ 25.9 mag (10σ) surface brightness limit μ ∼ 29 arcsec −2 (2σ above mean sky level), thus superseding all...
We present the color distributions of globular cluster (GC) systems for 100 early-type galaxies observed in ACS Virgo Cluster Survey, deepest and most homogeneous survey this kind to date. On average, at all luminosities our study (-22 < MB -15) appear have bimodal or asymmetric GC distributions. Almost possess a component metal-poor GCs, with average fraction metal-rich GCs ranging from 15% 60% increasing luminosity. The colors both subpopulations correlate host galaxy luminosity color, red...
We present g-z color and z-band surface brightness fluctuations (SBF) measurements for 43 early-type galaxies in the Fornax cluster imaged with HST/ACS. These are combined Virgo to derive a revised, nonlinear calibration of SBF absolute magnitude as function g-z. In all, we tabulate recalibrated distances 134 Virgo, Fornax, W' group, NGC4697 Southern Extension. The procedure yields precise relative distance modulus respect 0.42+/-0.03 mag, or ratio 1.214 +/- 0.017. resulting is 31.51 +/-0.03...
The fraction of stellar mass contained in globular clusters (GCs), also measured by number as the specific frequency, is a fundamental quantity that reflects both galaxy's early star formation and its entire merging history. We present frequencies, luminosities, fractions for cluster systems 100 early-type galaxies ACS Virgo Cluster Survey, largest homogeneous catalog kind. find following: (1) GC can be high giants dwarfs but are universally low with intermediate luminosities. (2) behavior...
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.
Limb-darkening is fundamental in determining transit lightcurve shapes, and typically modeled by a variety of laws that parametrize the intensity profile star being transited. Confronted with lightcurve, some authors fix parameters these laws, so-called limb-darkening coefficients (LDCs), while others prefer to let them float fitting procedure. Which best strategy, however, still unclear, as well how much each can bias retrieved parameters. In this work we attempt clarify those points first...
We describe the Next Generation Transit Survey (NGTS), which is a ground-based project searching for transiting exoplanets orbiting bright stars. NGTS builds on legacy of previous surveys, most notably WASP, and designed to achieve higher photometric precision hence find smaller planets than have previously been detected from ground. It also operates in red light, maximizing sensitivity late K early M dwarf The survey specifications call 0.1 per cent light over an instantaneous field view...
We present 197 planet candidates discovered using data from the first year of NASA K2 mission (Campaigns 0-4), along with results an intensive program photometric analyses, stellar spectroscopy, high-resolution imaging, and statistical validation. distill these into sets 104 validated planets (57 in multi-planet systems), 30 false positives, 63 remaining candidates. Our systems span a range properties, median values R_P = 2.3 R_E, P=8.6 d, Tef 5300 K, Kp=12.7 mag. Stellar spectroscopy...
We report the discovery of 158 previously undetected dwarf galaxies in Fornax cluster central regions using a deep coadded $u, g$ and $i$-band image obtained with DECam wide-field camera mounted on 4-meter Blanco telescope at Cerro Tololo Interamerican Observatory as part {\it Next Generation Survey} (NGFS). The new have quasi-exponential light profiles, effective radii $0.1\!<\!r_e\!<\!2.8$ kpc average surface brightness values $22.0\!<\!\mu_i\!<\!28.0$ mag arcsec$^{-2}$. confirm existence...
Determining the architecture of multi-planetary systems is one cornerstones understanding planet formation and evolution. Resonant are especially important as fragility their orbital configuration ensures that no significant scattering or collisional event has taken place since earliest phase when parent protoplanetary disc was still present. In this context, TOI-178 been subject particular attention first TESS observations hinted at a 2:3:3 resonant chain. Here we report results from...
Imaging surveys with the Hubble Space Telescope (HST) have shown that roughly 50-80% of low- and intermediate-luminosity galaxies contain a compact stellar nucleus at their center, regardless host galaxy morphological type. We combine HST imaging for early-type from ACS Virgo Cluster Survey ground-based long-slit spectra KPNO to show masses nuclei in obey tight correlation galaxies. The same is obeyed by supermassive black holes (SBHs) found predominantly massive Local Group M33 NGC205 are...
We investigate the connection between globular clusters and ultra-compact dwarf galaxies (UCDs) by examining properties of several compact objects associated with M87, all which were previously classified as clusters. Combining imaging from Hubble Space Telescope ground-based Keck spectroscopy, we find two to have half-light radii, velocity dispersions mass-to-light ratios that are consistent predictions population synthesis models for old, metal-rich, luminous Three other much larger, radii...
The Virgo Cluster is the dominant mass concentration in Local Supercluster and largest collection of elliptical lenticular galaxies nearby universe. In this paper, we present an introduction to ACS Survey: a program image, F475W F850LP bandpasses (Sloan g z), 100 early-type using Advanced Camera for Surveys on Hubble Space Telescope. We describe selection their ensemble properties, choice filters, field placement orientation, limiting magnitudes survey, coordinated parallel observations...
We have measured half-light radii, rh, for thousands of globular clusters (GCs) belonging to the 100 early-type galaxies observed in ACS Virgo Cluster Survey and elliptical galaxy NGC 4697. An analysis dependencies radii on both properties GCs themselves their host reveals that, analogy with Galaxy but a milder fashion, average radius increases increasing galactocentric distance or, alternatively, decreasing surface brightness. For first time, we find that decreases color. also show there is...
We analyze the luminosity function of globular clusters (GCs) belonging to early-type galaxies observed in ACS Virgo Cluster Survey. have obtained maximum likelihood estimates for a Gaussian representation cluster (GCLF) 89 galaxies. also fit functions with an "evolved Schechter function", which is meant reflect preferential depletion low-mass GCs, primarily by evaporation due two-body relaxation, from initial mass similar that young massive local starbursts and mergers. find highly...
We present catalogs of globular cluster candidates for the 100 galaxies Advanced Camera Surveys Virgo Cluster Survey, a large program to carry out imaging early-type members using (ACS) on Hubble Space Telescope. describe procedure used select bona fide full list detections based model-based clustering methods with use expected contamination constructed blank field observations and which are customized each galaxy. also contaminants our target galaxies. For detected source we measure its...
The Fornax Cluster is a conspicuous cluster of galaxies in the southern hemisphere and second largest collection early-type within ≲20 Mpc after Virgo Cluster. In this paper, we present brief introduction to ACS Survey—a program image, F475W (g475) F850LP (z850) bandpasses, 43 using Advanced Camera for Surveys (ACS) on Hubble Space Telescope. Combined with companion survey Virgo, Survey, represents most comprehensive imaging date environments terms depth, spatial resolution, sample size,...
HATSouth is the world's first network of automated and homogeneous telescopes that capable year-round 24-hour monitoring positions over an entire hemisphere sky. The primary scientific goal to discover characterize a large number transiting extrasolar planets, reaching out long periods down small planetary radii. achieves this by extended areas on sky, deriving high precision light curves for stars, searching signature transits, confirming candidates with larger telescopes. employs 6...
We use a highly homogeneous set of data from 132 early-type galaxies in the Virgo and Fornax clusters order to study properties globular cluster luminosity function (GCLF). The system each galaxy was studied using maximum likelihood approach model intrinsic GCLF after accounting for contamination completeness effects. results presented here update our measurements confirm previous showing tight correlation between dispersion absolute magnitude parent galaxy. Regarding as standard candle, we...