T. Anguita
A5043910696- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Statistical and numerical algorithms
- CCD and CMOS Imaging Sensors
- Advanced optical system design
- Cosmology and Gravitation Theories
- History and Developments in Astronomy
- Dark Matter and Cosmic Phenomena
- Remote Sensing in Agriculture
- Distributed and Parallel Computing Systems
- Advanced Vision and Imaging
- Atmospheric Ozone and Climate
- Mathematics and Applications
- Mathematics, Computing, and Information Processing
- Impact of Light on Environment and Health
Universidad Andrés Bello
2015-2024
Millennium Institute of Astrophysics
2015-2024
Pontificia Universidad Católica de Chile
2010-2013
Max Planck Institute for Astronomy
2011-2013
Heidelberg University
2008-2012
ABSTRACT We present a blind time-delay cosmographic analysis for the lens system DES J0408−5354. This is extraordinary presence of two sets multiple images at different redshifts, which provide opportunity to obtain more information cost increased modelling complexity with respect previously analysed systems. perform detailed mass distribution this using three band Hubble Space Telescope imaging. combine measured time delays, line-of-sight central velocity dispersion deflector, and...
We present high-precision photometry of two transit events the extrasolar planetary system WASP-5, obtained with Danish 1.54m telescope at ESO La Silla. In order to minimise both random and flat-fielding errors, we defocussed so its point spread function approximated an annulus diameter 40 pixels (16 arcsec). Data reduction was undertaken using standard aperture plus algorithm for optimally combining ensemble comparison stars. The resulting light curves have point-to-point scatters 0.50 mmag...
ABSTRACT We present an analysis of a deep (1 σ = 13 μ Jy) cosmological 1.2 mm continuum map based on ASPECS, the ALMA Spectroscopic Survey in Hubble Ultra Deep Field. In 1 arcmin 2 covered by ASPECS we detect nine sources at <?CDATA $\gt 3.5\sigma $?> significance mm. Our ALMA-selected sample has median redshift $z=1.6\pm 0.4$?> , with only one galaxy detected z > within survey area. This value is significantly lower than that found millimeter samples selected higher flux density cutoff...
We precisely constrain the inner mass profile of Abell 2261 (z=0.225) for first time and determine this cluster is not "over-concentrated" as found previously, implying a formation in agreement with ΛCDM expectations. These results are based on strong lensing analyses new 16-band HST imaging obtained part Cluster Lensing Supernova survey Hubble (CLASH). Combining revised weak Subaru wide field 5-band + KPNO photometry, we place tight constraints halo virial M_vir = 2.2\pm0.2\times10^15...
We present the rationale for and observational description of ASPECS: The ALMA SPECtroscopic Survey in Hubble Ultra-Deep Field (UDF), cosmological deep field that has deepest multi-wavelength data available. Our overarching goal is to obtain an unbiased census molecular gas dust continuum emission high-redshift (z$>$0.5) galaxies. $\sim$1$'$ region covered within UDF was chosen overlap with available imaging from HST. observations consist full frequency scans band 3 (84-115 GHz) 6...
We derive an accurate mass distribution of the galaxy cluster MACS J1206.2-0847 (z=0.439) from a combined weak-lensing distortion, magnification, and strong-lensing analysis wide-field Subaru BVRIz' imaging our recent 16-band Hubble Space Telescope observations taken as part Cluster Lensing And Supernova survey with (CLASH) program. find good agreement in regions overlap between several weak strong lensing reconstructions using wide variety modeling methods, ensuring consistency. The data...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
We present time-delay measurements for the new quadruply imaged quasar DES J0408-5354, first found in Dark Energy Survey (DES). Our result is made possible by implementing a observational strategy using almost daily observations with MPIA 2.2m telescope at La Silla observatory and deep exposures reaching signal-to-noise ratio of about 1000 per image. This data quality allows us to catch small photometric variations (a few mmag rms) quasar, acting on temporal scales much shorter than...
Strong-gravitational lens systems with quadruply-imaged quasars (quads) are unique probes to address several fundamental problems in cosmology and astrophysics. Although they intrinsically very rare, ongoing planned wide-field deep-sky surveys set discover thousands of such the next decade. It is thus paramount devise a general framework model strong-lens cope this large influx without being limited by expert investigator time. We propose modelling (implemented publicly available software...
Vera C. Rubin Observatory is a ground-based astronomical facility under construction, joint project of the National Science Foundation and U.S. Department Energy, designed to conduct multi-purpose 10-year optical survey southern hemisphere sky: Legacy Survey Space Time. Significant flexibility in strategy remains within constraints imposed by core science goals probing dark energy matter, cataloging Solar System, exploring transient sky, mapping Milky Way. The survey's massive data...
Abstract Strong gravitational lensing of quasars has the potential to unlock poorly understood physics these fascinating objects, as well serve a probe mass distribution and cosmological parameters. In particular, microlensing by compact bodies in galaxy can enable mapping quasar structure $<10^{-6}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo><</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>6</mml:mn> </mml:mrow> </mml:msup>...
We present the continuation of our long-term spectroscopic monitoring gravitationally lensed quasar QSO 2237+0305. investigate chromatic variations observed in UV/optical continuum both images A and B, compare them with numerical simulations to infer energy profile accretion disk. Our procedure combines microlensing ray-shooting technique Bayesian analysis, derives probability distributions for source sizes as a function wavelength. find that effective caustic crossing timescale is 4.0 ± 1.0...
We present and analyse light curves of four transits the Southern hemisphere extrasolar planetary system WASP-4, obtained with a telescope defocused so radius each point spread function was 17 arcsec (44 pixels). This approach minimizes both random systematic errors, allowing us to achieve scatters between 0.60 0.88 mmag per observation over complete transit events. The are augmented by published observations analysed using jktebop code. results this process combined theoretical stellar...
We report the detection of sub-Saturn-mass planet MOA-2008-BLG-310Lb and argue that it is strongest candidate yet for a bulge planet. Deviations from single-lens fit are smoothed out by finite-source effects so not immediately apparent light curve. Nevertheless, we find model in which primary has planetary companion favored over \Delta\chi^2 ~ 880 an additional three degrees freedom. Detailed analysis yields planet/star mass ratio q=(3.3+/-0.3)x10^{-4} angular separation between star within...
Abstract Within less than 15 years, the count of known planets orbiting stars other Sun has risen from none to more 400 with detections arising four successfully applied techniques: Doppler‐wobbles, planetary transits, gravitational microlensing, and direct imaging. While hunt for twin Earths is on, a statistically well‐defined sample population in all their variety required probing models planet formation orbital evolution so that origin harbour life, like including ours, can be understood....
ABSTRACT In this paper we use ASPECS, the ALMA Spectroscopic Survey in Hubble Ultra Deep Field band 3 and 6, to place blind constraints on CO luminosity function evolution of cosmic molecular gas density as a redshift up z ∼ 4.5. This study is based galaxies that have been selected solely through their emission not any other property. all bins ASPECS measurements reach predicted “knee” (around 5 × 10 9 K km s −1 pc 2 ). We find clear evidence an with respect 0, more CO-luminous present at 2....
ABSTRACT We present a search for [C ii ] line and dust continuum emission from optical dropout galaxies at z > 6 using ASPECS, our Atacama Large Millimeter submillimeter Array Spectroscopic Survey in the Hubble Ultra-deep Field (UDF). Our observations, which cover frequency range of 212–272 GHz, encompass approximately < 8 reach limiting luminosity L ∼ (1.6–2.5) × 10 ⊙ . identify 14 emitting candidates this redshift with significances >4.5 σ , two correspond to blind detections no...
Dusty star-forming galaxies are among the most prodigious systems at high redshift (z>1), characterized by star formation rates and huge dust reservoirs. The bright end of this population has been well in recent years, but considerable uncertainties remain for fainter dusty galaxies, which responsible bulk thus play a key role galaxy growth evolution. In first paper our series, we describe methods finding faint using millimeter observations with ALMA. We obtained ALMA 1.1 mm mosaic images...
We report the discovery, spectroscopic confirmation, and first lens models of first, strongly lensed quasars from a combined search in WISE Gaia-DR1 over DES footprint. Their Einstein radii span range between ≈2.0 arcsec ≈0.4 arcsec. Two these (WGD2038-4008, RA = 20:38:02.65, Dec. −40:08:14.64; WGD2021-4115, 20:21:39.45, −41:15:57.11) also have confirmed deflector redshifts. The four-image WGD2038-4008, with source redshifts s 0.777 ± 0.001 zl 0.230 0.002, respectively, has radius Reff ≈ 3.4...
We present time-delay estimates for the quadruply imaged quasar PG 1115+080. Our resuls are based on almost daily observations seven months at ESO MPIA 2.2m telescope La Silla Observatory, reaching a signal-to-noise ratio of about 1000 per image. In addition, we re-analyse existing light curves from literature that complete with an additional three seasons monitoring Mercator Palma Observatory. When exploring possible source bias consider so-called microlensing time delay, potential...
ABSTRACT We report the spectroscopic follow-up of 175 lensed quasar candidates selected using Gaia Data Release 2 observations following Paper III this series. Systems include 86 confirmed quasars and a further 17 likely based on imaging and/or similar spectra. also confirm 11 projected pairs physical pairs, while 25 systems are left as unclassified – at same redshift, which could be either distinct or potential quasars. Especially interesting objects eight quadruply imaged two have BAL...
Gravitational time delays provide a powerful one step measurement of $H_0$, independent all other probes. One key ingredient in delay cosmography are high accuracy lens models. Those currently expensive to obtain, both, terms computing and investigator (10$^{5-6}$ CPU hours $\sim$ 0.5-1 year, respectively). Major improvements modeling speed therefore necessary exploit the large number lenses that forecast be discovered over current decade. In order bypass this roadblock, building on work by...
ABSTRACT The flux ratios of gravitationally lensed quasars provide a powerful probe the nature dark matter. Importantly, these are sensitive to small-scale structure, irrespective presence baryons. This sensitivity may allow us study halo mass function even below scales where galaxies form observable stars. For accurate measurements, it is essential that quasar’s light emitted from physical region quasar with an angular scale milliarcseconds or larger; this minimizes microlensing effects by...
Aims. We aim to use microlensing taking place in the lensed quasar QSO 2237 + 0305 study structure of broad line region (BLR) and measure size emitting C iv iii] lines.