Eduardo Bañados
A5060482326- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Statistics Education and Methodologies
- Particle accelerators and beam dynamics
- Plant Water Relations and Carbon Dynamics
- Black Holes and Theoretical Physics
- Historical Astronomy and Related Studies
- Magnetic confinement fusion research
- Real-time simulation and control systems
- Computational Physics and Python Applications
Max Planck Institute for Astronomy
2014-2024
University College London
2024
University of Copenhagen
2024
Flatiron Health (United States)
2024
Flatiron Institute
2024
Royal Holloway University of London
2024
University of California, Davis
2024
New York University
2024
Princeton University
2024
Carnegie Observatories
2016-2023
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
On 2017 August 17, gravitational waves were detected from a binary neutron star merger, GW170817, along with coincident short gamma-ray burst, GRB170817A. An optical transient source, Swope Supernova Survey 17a (SSS17a), was subsequently identified as the counterpart of this event. We present ultraviolet, and infrared light curves SSS17a extending 10.9 hours to 18 days post-merger. constrain radioactively-powered resulting ejection neutron-rich material. The fast rise curves, subsequent...
Distant quasars are unique tracers to study the formation of earliest supermassive black holes (SMBHs) and history cosmic reionization. Despite extensive efforts, only two have been found at $z\ge7.5$, due a combination their low spatial density high contamination rate in quasar selection. We report discovery luminous $z=7.642$, J0313$-$1806, most distant yet known. This has bolometric luminosity $3.6\times10^{13} L_\odot$. Deep spectroscopic observations reveal SMBH with mass $(1.6\pm0.4)...
On 2017 August 17, Swope Supernova Survey 2017a (SSS17a) was discovered as the optical counterpart of binary neutron star gravitational wave event GW170817. We report time-series spectroscopy SSS17a from 11.75 hours until 8.5 days after merger. Over first hour observations ejecta rapidly expanded and cooled. Applying blackbody fits to spectra, we measure photosphere cooling $11,000^{+3400}_{-900}$ K $9300^{+300}_{-300}$ K, determine a photospheric velocity roughly 30% speed light. The...
We present the discovery of nine quasars at $z\sim6$ identified in Sloan Digital Sky Survey (SDSS) imaging data. This completes our survey SDSS footprint. Our final sample consists 52 $5.7<z\le6.4$, including 29 with $z_{\rm AB}\le20$ mag selected from 11,240 deg$^2$ single-epoch (the main survey), 10 $20\le z_{\rm AB}\le20.5$ 4223 overlap regions (regions two or more scans), and 13 down to AB}\approx22$ 277 Stripe 82. They span a wide luminosity range $-29.0\le M_{1450}\le-24.5$....
We present a survey of the [CII] 158 $\mu$m line and underlying far-infrared (FIR) dust continuum emission in sample 27 z>6 quasars using Atacama Large Millimeter Array (ALMA) at ~1" resolution. The was significantly detected (at >5-sigma) 23 sources (85%). find typical luminosities $L_{\rm [CII]}=10^{9-10}$ L$_\odot$, an average width ~385 km/s. [CII]-to-far-infrared luminosity ratio ([CII]/FIR) our span one order magnitude, highlighting variety conditions star-forming medium. Four quasar...
Abstract Quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they unique probes of the early universe. To date, only a few quasars have been reported at <?CDATA $z\gt 6.5$?> (<800 Myr after big bang). In this work, we present six additional $z\gtrsim discovered using Pan-STARRS1 survey. We use sample 15 perform homogeneous and comprehensive analysis highest-redshift quasar population. report four main results: (1) majority show large blueshifts broad...
Abstract During reionization, neutral hydrogen in the intergalactic medium (IGM) imprints a damping wing absorption feature on spectrum of high-redshift quasars. A detection this signature provides compelling evidence for significantly universe, and enables measurements fraction x H i ( z ) at that epoch. Obtaining reliable quantitative constraints from technique, however, is challenging due to stochasticity induced by patchy inside-out topology degeneracies with quasar lifetime, unknown...
ABSTRACT Luminous quasars at <?CDATA $z\gt 5.6$?> can be studied in detail with the current generation of telescopes and provide us unique information on first gigayear universe. Thus far, these studies have been statistically limited by number known redshifts. Such are rare, therefore, wide-field surveys required to identify them, multiwavelength data separate them efficiently from their main contaminants, far more numerous cool dwarfs. In this paper, we update extend selection for $z\sim...
Abstract Luminous z ≥ 7 quasars provide direct probes of the evolution supermassive black holes (SMBHs) and intergalactic medium (IGM) during epoch reionization (EoR). The Ly α damping wing absorption imprinted by neutral hydrogen in IGM can be detected a single EoR quasar spectrum, allowing measurement fraction toward that line sight. However, features have only been two > previous studies. In this paper, we present new high-quality optical near-infrared spectroscopy = 7.00 DES...
Quasars at cosmic dawn provide powerful probes of the formation and growth earliest supermassive black holes (SMBHs) in Universe, their connections to galaxy structure formation, evolution intergalactic medium (IGM) epoch reionization (EoR). Hundreds quasars have been discovered first billion years history, with quasar redshift frontier extended z ∼ 7.6. Observations show following: ▪The number density luminous declines exponentially > 5, suggesting that emerge 10; lack strong average...
Abstract We report the results of near-infrared spectroscopic observations 37 quasars in redshift range 6.3 < z ≤ 7.64, including 32 at > 6.5, forming largest quasar spectral sample this redshift. The spectra, taken with Keck, Gemini, VLT, and Magellan, allow investigations central black hole mass rest-frame ultraviolet properties. masses derived from Mg ii emission lines are (0.3–3.6) × 10 9 M ⊙ , which requires massive seed holes ≳10 3 –10 4 assuming Eddington accretion since = 30....
We present measurements of black hole masses and Eddington ratios for a sample 38 bright (M$_{1450}$ < -24.4 mag) quasars at 5.8 z 7.5, derived from VLT/X-shooter near-IR spectroscopy their broad CIV MgII emission lines. The (on average M$_{BH}$ ~ 4.6 x 10$^9$ M$_{\odot}$) accretion rates (with ranging between 0.1 1.0) are broadly consistent with that similarly luminous 0.3 2.3 quasars, but there is evidence mild increase in the median ratio going towards > 6. Combined deep ALMA observations...
The current standard model of cosmology successfully describes a variety measurements, but the nature its main ingredients, dark matter and energy, remains unknown. is medium-class mission in Cosmic Vision 2015--2025 programme European Space Agency (ESA) that will provide high-resolution optical imaging, as well near-infrared imaging spectroscopy, over about 14\,000\,deg$^2$ extragalactic sky. In addition to accurate weak lensing clustering measurements probe structure formation half age...
We present the first results from JWST ASPIRE program (A SPectroscopic survey of biased halos In Reionization Era). This represents an imaging and spectroscopic 25 reionization-era quasars their environments by utilizing unprecedented capabilities NIRCam Wide Field Slitless Spectroscopy (WFSS) mode. will deliver largest ($\sim280~{\rm arcmin}^2$) galaxy redshift at 3-4 $\mu$m among Cycle-1 programs provide extensive legacy values for studying formation earliest supermassive black holes...
ABSTRACT The final phase of the reionization process can be probed by rest-frame UV absorption spectra quasars at z ≳ 6, shedding light on properties diffuse intergalactic medium within first Gyr Universe. ESO Large Programme ‘XQR-30: ultimate XSHOOTER legacy survey ≃ 5.8–6.6’ dedicated ∼250 h observations VLT to create a homogeneous and high-quality sample 30 luminous ∼ covering rest wavelength range from Lyman limit beyond Mg ii emission. Twelve quasar similar quality archive were added...
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
Abstract We present in this paper (Paper II of the series) a 35 arcmin 2 JWST/NIRCam imaging and wide-field slitless spectroscopy mosaic centered on J0305–3150, luminous quasar at z = 6.61. The F356W grism data reveal 124 [O iii ]+H β emitters 5.3 < 7, 53 which constitute protocluster spanning (10 cMpc) across 6.5 6.8. find no evidence any broad-line active galactic nucleus (AGN) individual galaxies or stacking, reporting median H FWHM 585 ± 152 km s −1 ; however, mass–excitation diagram...
Abstract A SPectroscopic survey of bIased halos in the Reionization Era is a quasar legacy primarily using JWST to target sample 25 z > 6 quasars with NIRCam slitless spectroscopy and imaging. The first study this series found evidence strong overdensity galaxies around J0305−3150, luminous at = 6.61, within single pointing obtained Cycle 1. Here we present results 2 mosaic that covers 35 arcmin imaging/wide-field same field investigate spatial extent putative protocluster. F356W grism...
Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and growth massive galaxies black holes in early universe. Absorption due to neutral hydrogen IGM makes beyond a redshift very faint optical z band, thus locating at higher redshifts requires large surveys that sensitive above 1 micron. We report discovery three new quasars, corresponding an age universe Myr, selected as z-band dropouts Pan-STARRS1 survey. This increases number known from four seven....
High-redshift quasars are currently the only probes of growth supermassive black holes and potential tracers structure evolution at early cosmic time. Here we present our candidate selection criteria from Panoramic Survey Telescope & Rapid Response System 1 follow-up strategy to discover in redshift range 5.7 ≲ z 6.2. With this discovered eight new ⩽ 6.0 quasars, increasing number known > by more than 10%. We additionally recovered 18 previously quasars. The presented here span a large...
The recent detection of ULASJ1342+0928, a bright QSO at |$z$| = 7.54, provides powerful probe the ionization state intervening intergalactic medium, potentially allowing us to set strong constraints on epoch reionization (EoR). Here we quantify presence Ly α damping wing absorption from EoR in spectrum ULASJ1342+0928. Our Bayesian framework simultaneously accounts for uncertainties (i) intrinsic emission (reconstructing profile covariance matrix lines) and (ii) distribution H ii regions...