I. Toledo

Atacama Large Millimeter Submillimeter Array

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D. Minniti

Universidad Andrés Bello

R. K. Saito

Universidade Federal de Santa Catarina

R. Kurtev

University of Valparaíso

J. Borissova

University of Valparaíso

P. W. Lucas

University of Hertfordshire

M. Hempel

Universidad Andrés Bello

M. Catelan

Pontificia Universidad Católica de Chile

C. Moni Bidin

Universidad Católica del Norte

V. D. Ivanov

European Southern Observatory

D. Geisler

University of Concepción

Cooperative Institutions

Pontificia Universidad Católica de Chile

Centre National de la Recherche Scientifique

European Southern Observatory

Max Planck Society

Millennium Institute of Astrophysics

Space Telescope Science Institute

Center for Astrophysics Harvard & Smithsonian

Atacama Large Millimeter Submillimeter Array

Consejo Nacional de Investigaciones Científicas y Técnicas

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VISTA Variables in the Vía Láctea (VVV): Halfway Status and Results

arXiv (Cornell University) (2014)

M. Hempel D. Minniti Istvan Dékány R. K. Saito P. W. Lucas

The VISTA Variables in the Vía Láctea (VVV) survey is one of six public ESO surveys, and is now in its 4th year of observing. Although far from being complete, the VVV survey has already delivered many results, some directly connected to the intended science goals (detection of variables stars, microlensing events, new star clusters), others concerning more exotic objects, e.g. novae. Now, at the end of the fourth observing period, and comprising roughly 50% of the proposed observations, the actual status of the survey, as well some of the results based on the VVV data, are presented.

Gravitational microlensing

10.48550/arxiv.1406.3241

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Citations (5)

Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption

Nature (2012)

A. Rest J. L. Prieto N. R. Walborn Nathan Smith Federica Bianco

10.1038/nature10775

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Citations (71)

VISTA VARIABLES IN THE VíA LÁCTEA (VVV): FIRST RESULTS AND PERSPECTIVES

Revista Mexicana de Astronomía y Astrofísica (2011)

R. K. Saito D. Minniti I. Dékány M. Hempel J. Alonso-García

Resumen en: VISTA Variables in the Via Lactea (VVV) is a public ESO near-IR variability survey scanning the Milky Way Bulge and an adjacent section of the mid-plane....

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Low-ionization galaxies and evolution in a pilot survey up toz= 1

Research in Astronomy and Astrophysics (2011)

E. Giraud Qiusheng Gu Jorge Melnick H. Quintana F. Selman

We present galactic spectroscopic data from a pencil beam of 10.75' × 7.5' centered on the X-ray cluster RXJ0054.0-2823 at z = 0.29. We study the spectral evolution of galaxies from z = 1 down to the cluster redshift in a magnitude-limited sample at R ≤ 23, for which the statistical properties of the sample are well understood. We divide emission-line galaxies into star-forming galaxies, Low Ionization Nuclear Emission line Regions (LINERs), and Seyferts by using emission-line ratios of [OII], Hβ, and [OIII], and derive stellar fractions from population synthesis models. We focus our analysis on absorption and low-ionization galaxies. For absorption-line galaxies, we recover the well-known result that these galaxies have had no detectable evolution since z ∼ 0.6 – 0.7, but we also find that in the range z = 0.65 – 1, at least 50% of the stars in bright absorption systems are younger than 2.5 Gyr Faint absorption-line galaxies in the cluster at z = 0.29 also had significant star formation during the previous 2 – 3 Gyr, but their brighter counterparts seem to be only composed of old stars. At z ∼ 0.8, our dynamically young cluster had a truncated red-sequence. This result seems to be consistent with a scenario where the final assembly of E/S0 took place at z < 1. In the volume-limited range 0.35 ≤ z ≤ 0.65, we find that 23% of the early-type galaxies have LINER-like spectra with Hβ in absorption and have a significant component of A stars. The vast majority of LINERs in our sample have significant populations of young and intermediate-aged stars and are thus not related to AGNs, but to the population of 'retired galaxies' recently identified by Cid Fernandes et al. in the Sloan Digital Sky Survey (SDSS). Early-type LINERs with various fractions of A stars and E+A galaxies appear to play an important role in the formation of the red sequence.

10.1088/1674-4527/11/3/001

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VVV: The near-IR Milky Way bulge and plane survey

EPJ Web of Conferences (2012)

M. Rejkuba O. A. González I. Toledo D. Minniti P. W. Lucas

The ESO public survey “VISTA Variables in the Via Lactea” (VVV) started mapping the inner disk and bulge of our Galaxy with the VISTA 4m telescope in the near-IR in 2010. The planned survey area of 520 deg2 is observed in the Z, Y, J, H and Ks filters, and in addition more than 100 epochs of repeated imaging in Ks will be collected over ∼5 years. The final products will be a deep near-IR atlas in five passbands, and catalogue of more than a million variable sources. This public survey will provide data available to the whole community and therefore will enable further studies of the history of the Milky Way, its star cluster evolution, and the population census of the Galactic Bulge and center, as well as the investigations of the star formation regions in the disk.

Galactic plane

Stellar population

10.1051/epjconf/20121909009

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Initial linguistic and cultural validation of the satisfaction survey for inflatable penile implant (SSIPI) in Spanish

Actas Urológicas Españolas (English Edition) (2025)

Bernardita M. Ljubetic Samantha L. Thorogood E. Becher I. Toledo Rafael Carrión

Inflatable

10.1016/j.acuroe.2025.501700

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Discovery of VVV CL001

Astronomy and Astrophysics (2011)

D. Minniti M. Hempel I. Toledo V. D. Ivanov J. Alonso-García

Context: It is not known how many globular clusters may have been left undetected towards the Galactic bulge. Aims: One of the aims of the VISTA Variables in the Via Lactea (VVV) Survey is to accurately measure the physical parameters of the known globular clusters in the inner regions of the Milky Way and to search for new ones, hidden in regions of large extinction. Methods: Deep near infrared images give deep JHKs-band photometry of a region surrounding the known globular cluster UKS 1 and reveal a new low-mass globular cluster candidate that we name VVV CL001. Results: We use the horizontal branch red clump in order to measure E(B-V)~2.2 mag, $(m-M)_0$=16.01 mag, and D=15.9 kpc for the globular cluster UKS 1. Based on the near-infrared colour magnitude diagrams, we also measure that VVV CL001 has E(B-V)~2.0, and that it is at least as metal-poor as UKS 1, however, its distance remains uncertain. Conclusions: Our finding confirms the previous projection that the central region of the Milky Way harbors more globular clusters. VVV CL001 and UKS 1 are good candidates for a physical cluster binary, but follow-up observations are needed to decide if they are located at the same distance and have similar radial velocities.

Red clump

Horizontal branch

10.1051/0004-6361/201015795

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Citations (65)

THE SIZE, SHAPE, ALBEDO, DENSITY, AND ATMOSPHERIC LIMIT OF TRANSNEPTUNIAN OBJECT (50000) QUAOAR FROM MULTI-CHORD STELLAR OCCULTATIONS

The Astrophysical Journal (2013)

F. Braga-Ribas B. Sicardy J. L. Ortiz E. Lellouch G. Tancredi

We present results derived from the first multi-chord stellar occultations by the transneptunian object (50000) Quaoar, observed on 2011 May 4 and 2012 February 17, and from a single-chord occultation observed on 2012 October 15. If the timing of the five chords obtained in 2011 were correct, then Quaoar would possess topographic features (crater or mountain) that would be too large for a body of this mass. An alternative model consists in applying time shifts to some chords to account for possible timing errors. Satisfactory elliptical fits to the chords are then possible, yielding an equivalent radius Requiv = 555 ± 2.5 km and geometric visual albedo pV = 0.109 ± 0.007. Assuming that Quaoar is a Maclaurin spheroid with an indeterminate polar aspect angle, we derive a true oblateness of , an equatorial radius of km, and a density of 1.99 ± 0.46 g cm−3. The orientation of our preferred solution in the plane of the sky implies that Quaoar's satellite Weywot cannot have an equatorial orbit. Finally, we detect no global atmosphere around Quaoar, considering a pressure upper limit of about 20 nbar for a pure methane atmosphere.

Geometric albedo

Occultation

Chord (peer-to-peer)

10.1088/0004-637x/773/1/26

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Citations (90)

High relative velocity central dumbbells in poor clusters

Astronomische Nachrichten (2009)

H. Quintana D. Proust G. Hertling A. Ramírez I. Toledo

Abstract We propose that some high relative velocity dumbbell galaxies are the centers of poor clusters or groups that are coming into a merging process. The components of these galaxies closely follow the incoming velocity of the merging groups, as revealed by the bimodality of the velocity histograms. Only mergers in a direction with a small angle to the line of sight can show the large velocity difference of the components and the velocity separation of incoming subgroups in the histograms. In this case the simple interpretation would be that the dumbbells components are also in an early phase of their merger, as they still keep the information of the incoming orbits, but analysis of a numerous sample is needed to prove this suggestion (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Bimodality

Dumbbell

Relative velocity

Peculiar velocity

Group velocity

10.1002/asna.200911264

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Citations (1)

Stellar Occultations by TNOs: the January 08, 2011 by (208996) 2003 AZ84 and the May 04, 2011 by (50000) Quaoar

HAL (Le Centre pour la Communication Scientifique Directe) (2011)

F. Braga-Ribas B. Sicardy J. L. Ortiz Emmanuël Jehin J. I. B. Camargo

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Citations (3)