A. Zenteno
A5085942452- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- CCD and CMOS Imaging Sensors
- Neutrino Physics Research
- Superconducting and THz Device Technology
- Spectroscopy and Laser Applications
- Planetary Science and Exploration
- Scientific Computing and Data Management
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Nuclear Issues and Defense
Cerro Tololo Inter-American Observatory
2015-2024
Fermi National Accelerator Laboratory
2018
University of Sussex
2018
Ludwig-Maximilians-Universität München
2010-2017
Excellence Cluster Universe
2010-2015
University of Illinois Urbana-Champaign
2007-2010
We present UV, optical, and NIR photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced LIGO/Virgo, binary neutron star merger GW170817. Our data set extends discovery optical at $0.47$ days $18.5$ post-merger, includes observations with Dark Energy Camera (DECam), Gemini-South/FLAMINGOS-2 (GS/F2), {\it Hubble Space Telescope} ({\it HST}). The spectral energy distribution (SED) inferred this $0.6$ is well described by blackbody model $T\approx 8300$...
We present constraints on the dark energy equation-of-state parameter, w=P/(rho c^2), using 60 Type Ia supernovae (SNe Ia) from ESSENCE supernova survey. derive a set of nature assuming flat Universe. By including (Omega_M, w) baryon acoustic oscillations, we obtain value for static parameter w=-1.05^{+0.13}_{-0.12} (stat; 1 sigma) +- 0.11 (sys) and Omega_M=0.274^{+0.033}_{-0.020} with best-fit chi^2/DoF 0.96. These results are consistent those reported by SuperNova Legacy Survey in similar...
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg$^2$ South Pole Telescope (SPT) data. This work represents the complete sample detected at high significance in 2500-square-degree SPT-SZ survey, which was completed 2011. A total 677 (409) cluster candidates are identified above signal-to-noise threshold $\xi$ =4.5 (5.0). Ground- and space-based optical near-infrared (NIR) imaging confirms overdensities similarly colored galaxies...
The first cosmological results from the ESSENCE supernova survey (Wood-Vasey and coworkers) are extended to a wider range of models including dynamical dark energy nonstandard models. We fold in greater number external data sets such as recent Higher-z release high-redshift supernovae (Riess coworkers), well several complementary probes. Model comparison statistics Bayesian Akaike information criteria applied gauge worth These favor that give good fit with fewer parameters. Based on this...
Abstract We present the Dark Energy Camera (DECam) discovery of optical counterpart first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, as soon localization region became accessible from Chile. imaged 70 deg 2 in i and z bands, covering 93% initial integrated probability, to a depth necessary identify likely counterparts (e.g., kilonova). At 11.4 post-merger we bright transient located nucleus NGC 4993 at...
We report the results of an 87 square-degree point-source survey centered at R.A. 5h30m, decl. -55 deg. taken with South Pole Telescope (SPT) 1.4 and 2.0 mm wavelengths arc-minute resolution milli-Jansky depth. Based on ratio flux in two bands, we separate detected sources into populations, one consistent synchrotron emission from active galactic nuclei (AGN) thermal dust. present source counts for each population 11 to 640 mJy 4.4 800 mm. The are dominated by synchrotron-dominated across...
We present a detection-significance-limited catalog of 21 Sunyaev-Zel'dovich selected galaxy clusters. These clusters, along with 1 unconfirmed candidate, were identified in 178 deg^2 sky surveyed 2008 by the South Pole Telescope to depth 18 uK-arcmin at 150 GHz. Optical imaging from Blanco Cosmology Survey (BCS) and Magellan telescopes provided photometric (and some cases spectroscopic) redshift estimates, redshifts ranging z=0.15 z>1, median z = 0.74. Of confirmed three previously as...
(abridged) We present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich survey. consider 377 cluster candidates at z>0.25 with a detection significance greater than five, corresponding to 95% purity threshold for compute on models using measured abundance as function of mass and redshift. include additional multi-wavelength observations, including Chandra X-ray data...
We present a catalog of galaxy cluster candidates, selected through their Sunyaev–Zel'dovich (SZ) effect signature in the first 720 deg2 South Pole Telescope (SPT) survey. This area was mapped with SPT 2008 and 2009 austral winters to depth ∼18 μKCMB-arcmin at 150 GHz; 550 it also ∼44 95 GHz. Based on optical imaging all 224 candidates near-infrared majority we have found and/or infrared counterparts for 158, which then classify as confirmed clusters. Of these 158 clusters, 135 were...
We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ) cluster survey in combination with X-ray to constrain cosmological parameters. present a statistical method that fits for scaling relations of SZ and observables mass while jointly fitting cosmology. The is generalizable multiple observables, self-consistently accounts effects selection uncertainties calibration on derived constraints. apply this data set consisting an SZ-selected catalog 18 galaxy clusters at z...
The South Pole Telescope (SPT) is conducting a Sunyaev–Zel'dovich (SZ) effect survey over large areas of the southern sky, searching for massive galaxy clusters to high redshift. In this preliminary study, we focus on 40 deg2 area targeted by Blanco Cosmology Survey (BCS), which centered roughly at right ascension 5h30m, declination −53° (J2000). Over two seasons observations, entire region has been mapped SPT 95 GHz, 150 and 225 GHz. We report four most significant detections SZ in field,...
We describe the implementation and optimization of ESSENCE supernova survey, which we have undertaken to measure equation state parameter dark energy. present a method for optimizing survey exposure times cadence maximize our sensitivity energy w=P/rho c^2 given fixed amount telescope time. For on CTIO 4m telescope, measuring luminosity distances redshifts supernovae at modest (z~0.5 +- 0.2) is optimal determining w. data analysis pipeline based using reliable robust image subtraction find...
The Blanco Cosmology Survey (BCS) is a 60 night imaging survey of $\sim$80 deg$^2$ the southern sky located in two fields: ($\alpha$,$\delta$)= (5 hr, $-55^{\circ}$) and (23 $-55^{\circ}$). was carried out between 2005 2008 $griz$ bands with Mosaic2 imager on 4m telescope. primary aim BCS to provide data required optically confirm measure photometric redshifts for Sunyaev-Zel'dovich effect selected galaxy clusters from South Pole Telescope Atacama Telescope. We process calibrate data,...
The South Pole Telescope (SPT) is currently surveying 2500 deg^2 of the southern sky to detect massive galaxy clusters out epoch their formation using Sunyaev-Zel'dovich (SZ) effect. This paper presents a catalog 26 most significant SZ cluster detections in full survey region. includes 14 which have been previously identified and 12 that are new discoveries. These were fields observed two differing noise depths: 1500 at final SPT depth 18 uK-arcmin 150 GHz, 1000 54 uK-arcmin. Clusters...
We present first results on the cooling properties derived from Chandra X-ray observations of 83 high-redshift (0.3 < z 1.2) massive galaxy clusters selected by their Sunyaev–Zel'dovich signature in South Pole Telescope data. measure each cluster's central time, entropy, and mass deposition rate, compare these to those for local cluster samples. find no significant evolution ∼ 0 1 distribution properties, suggesting that cores is stable over long periods time. also average cool core entropy...
We present a velocity dispersion-based mass calibration of the South Pole Telescope Sunyaev-Zel'dovich effect survey (SPT-SZ) galaxy cluster sample. Using homogeneously selected sample 100 candidates from 720 deg2 along with 63 dispersion ($\sigma_v$) and 16 X-ray Yx measurements clusters, we simultaneously calibrate mass-observable relation constrain cosmological parameters. The calibrations using $\sigma_v$ are consistent at $0.6\sigma$ level, preferring ~16% higher masses. use full...
We present results of X-ray observations a sample 15 clusters selected via their imprint on the cosmic microwave background from thermal Sunyaev–Zel'dovich (SZ) effect. These are subset first SZ-selected cluster catalog, obtained 178 deg2 sky surveyed by South Pole Telescope (SPT). Using with Chandra and XMM-Newton, we estimate temperature, TX, mass, Mg, intracluster medium within r500 for each cluster. From these, calculate YX = MgTX total mass using an M500–YX scaling relation measured...
We derive cosmological constraints using a galaxy cluster sample selected from the 2500~deg$^2$ SPT-SZ survey. The spans redshift range $0.25< z<1.75$ and contains 343 clusters with SZ detection significance $\xi>5$. is supplemented optical weak gravitational lensing measurements of 32 $0.29<z<1.13$ (from Magellan HST) X-ray 89 $0.25<z<1.75$ Chandra). rely on minimal modeling assumptions: i) provides an accurate means measuring halo masses, ii) mean observables are related to true mass...
We perform a search for stellar streams around the Milky Way using first three years of multi-band optical imaging data from Dark Energy Survey (DES). use DES covering $\sim 5000$ sq. deg. to depth $g > 23.5$ with relative photometric calibration uncertainty $< 1 \%$. This set yields unprecedented sensitivity density field in southern celestial hemisphere, enabling detection faint heliocentric distance 50$ kpc. matched-filter color-magnitude space derived synthetic isochrone an old,...
We present the results of ground- and space-based optical near-infrared (NIR) follow-up 224 galaxy cluster candidates detected with Sunyaev-Zel'dovich (SZ) effect in 720 deg^2 South Pole Telescope (SPT) survey completed 2008 2009 observing seasons. use optical/NIR data to establish whether each candidate is associated an overdensity galaxies estimate redshift. Most photometric redshifts are derived through a combination three different redshift estimators using red-sequence galaxies,...
We present an HST/ACS weak gravitational lensing analysis of 13 massive high-redshift (z_median=0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part a larger campaign that aims to robustly calibrate mass-observable scaling relations over wide range redshift enable improved cosmological constraints from SPT cluster sample. introduce new strategies ensure systematics do not degrade on significantly. First, we efficiently remove...
We present DES14X3taz, a new hydrogen-poor super luminous supernova (SLSN-I) discovered by the Dark Energy Survey (DES) program, with additional photometric data provided Using DECam for Superluminous Supernovae (SUDSS). Spectra obtained using OSIRIS on Gran Telescopio CANARIAS (GTC) show DES14X3taz is SLSN-I at z=0.608. Multi-color photometry reveals double-peaked light curve: blue and relatively bright initial peak that fades rapidly prior to slower rise of main curve. Our multi-color...
We report the discovery of Pegasus IV, an ultra-faint dwarf galaxy found in archival data from Dark Energy Camera processed by DECam Local Volume Exploration Survey. IV is a compact, stellar system ($r_{1/2} = 41^{+8}_{-6}$ pc; $M_V -4.25 \pm 0.2$ mag) located at heliocentric distance $90^{+4}_{-6}$ kpc. Based on spectra seven non-variable member stars observed with Magellan/IMACS, we confidently resolve IV's velocity dispersion, measuring $\sigma_{v} 3.3^{+1.7}_{-1.1} \text{ km s}^{-1}$...