Guillermo A. Blanc
A5010251600- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- History and Developments in Astronomy
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Atmospheric Ozone and Climate
- Semiconductor Lasers and Optical Devices
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Superconducting and THz Device Technology
- Spectroscopy Techniques in Biomedical and Chemical Research
Carnegie Observatories
2015-2024
Carnegie Institution for Science
2015-2024
University of Chile
2015-2024
Las Campanas Observatory
2022-2024
Millennium Institute of Astrophysics
2015-2021
University of La Serena
2020
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2001-2019
Délégation Paris 7
2004-2019
Sorbonne Paris Cité
2019
Centre National de la Recherche Scientifique
2003-2019
We report measurements of ΩM, ΩΛ, and w from 11 supernovae (SNe) at z = 0.36-0.86 with high-quality light curves measured using WFPC2 on the Hubble Space Telescope (HST). This is an independent set high-redshift SNe that confirms previous SN evidence for accelerating universe. The available photometry make it possible these alone to provide cosmological parameters comparable in statistical weight results. Combined earlier Supernova Cosmology Project data, new yield a measurement mass density...
We present a new compilation of Type Ia supernovae (SNe Ia), dataset low-redshift nearby-Hubble-flow SNe and analysis procedures to work with these heterogeneous compilations. This ``Union'' 414 SN Ia, which reduces 307 after selection cuts, includes the recent large samples from Supernova Legacy Survey ESSENCE Survey, older datasets, as well recently extended distant observed HST. A single, consistent blind procedure is used for all various subsamples, implemented that consistently weights...
Abstract We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands Milky Way stars at high resolution and signal-to-noise ratios in near-infrared. Mapping Nearby Galaxies (MaNGA) survey obtaining spatially resolved spectroscopy for nearby galaxies (median <?CDATA $z\sim 0.03$?> ). extended Baryon Oscillation Spectroscopic (eBOSS)...
We present an overview of a new integral field spectroscopic survey called MaNGA (Mapping Nearby Galaxies at Apache Point Observatory), one three core programs in the fourth-generation Sloan Digital Sky Survey (SDSS-IV) that began on 2014 July 1. will investigate internal kinematic structure and composition gas stars unprecedented sample 10,000 nearby galaxies. summarize essential characteristics instrument design context MaNGA's key science goals prototype observations to demonstrate...
This paper documents the seventeenth data release (DR17) from Sloan Digital Sky Surveys; fifth and final fourth phase (SDSS-IV). DR17 contains complete of Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal surveying over 10,000 nearby galaxies. The MaNGA Stellar Library (MaStar) accompanies this data, providing observations almost 30,000 stars through instrument during bright time. also Galactic Evolution Experiment 2 (APOGEE-2) survey publicly...
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes second data release from this phase, and 14th SDSS overall (making Data Release Fourteen or DR14). makes taken by SDSS-IV its first two years (2014–2016 July) public. Like all previous releases, DR14 is cumulative, including most recent reductions calibrations phase began operations 2000. New public extended Baryon Oscillation Spectroscopic Survey; Apache Point...
Abstract The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2), Mapping Nearby Galaxies at APO (MaNGA), and Extended Baryon Oscillation Spectroscopic (eBOSS). As well as its program, eBOSS contains two major subprograms: Time Domain (TDSS) SPectroscopic IDentification ERosita Sources (SPIDERS). This paper describes first data release from SDSS-IV,...
Twenty years have passed since first light for the Sloan Digital Sky Survey (SDSS). Here, we release data taken by fourth phase of SDSS (SDSS-IV) across its three operation (July 2014-July 2017). This is third SDSS-IV, and fifteenth from (Data Release Fifteen; DR15). New come MaNGA - 4824 datacubes, as well stellar spectra in Stellar Library (MaStar), set survey-supported analysis products (e.g. gas kinematics, emission line, other maps) Data Analysis Pipeline (DAP), a new visualisation...
We describe the results of an extremely deep, 0.28 deg2 survey for z = 3.1 Lyα emission-line galaxies in Extended Chandra Deep Field-South. By using a narrowband 5000 Å filter and complementary broadband photometry from MUSYC survey, we identify statistically complete sample 162 with monochromatic fluxes brighter than 1.5 × 10-17 ergs cm-2 s-1 observer's frame equivalent widths greater 80 Å. show that width distribution these objects follows exponential rest-frame scale length w0 76 In...
This paper documents the sixteenth data release (DR16) from Sloan Digital Sky Surveys; fourth and penultimate phase (SDSS-IV). is first of southern hemisphere survey Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new APOGEE-2 North are also included. DR16 notable as final for main cosmological program Extended Baryon Oscillation Spectroscopic Survey (eBOSS), all raw reduced spectra that project released here. includes Time Domain (TDSS) SPectroscopic IDentification...
Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV (SDSS-IV), is an integral-field spectroscopic (IFS) survey roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles 2 arcsec fibers to obtain resolved spectroscopy over a wide wavelength range 3,600-10,300A. To map internal variations within each galaxy, we need perform accurate {\it spectral surface photometry}, which calibrate...
Abstract We present PHANGS–ALMA, the first survey to map CO J = 2 → 1 line emission at ∼1″ ∼100 pc spatial resolution from a representative sample of 90 nearby ( d ≲ 20 Mpc) galaxies that lie on or near z 0 “main sequence” star-forming galaxies. traces bulk distribution molecular gas, which is cold, phase interstellar medium. At achieved by each beam reaches size typical individual giant cloud, so these data can be used measure demographics, life cycle, and physical state clouds across...
It remains a major challenge to derive theory of cloud-scale ($\lesssim100$ pc) star formation and feedback, describing how galaxies convert gas into stars as function the galactic environment. Progress has been hampered by lack robust empirical constraints on giant molecular cloud (GMC) lifecycle. We address this problem systematically applying new statistical method for measuring evolutionary timeline GMC lifecycle, formation, feedback sample nine nearby disc galaxies, observed part...
Abstract We measure the velocity dispersion, σ , and surface density, Σ, of molecular gas in nearby galaxies from CO spectral line cubes with spatial resolution 45–120 pc, matched to size individual giant clouds. Combining 11 PHANGS-ALMA survey four targets literature, we characterize ∼30,000 independent sightlines where is detected at good significance. Σ show a strong positive correlation, best-fit power-law slope close expected value for resolved, self-gravitating This indicates only weak...
ABSTRACT Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) is an optical fiber-bundle integral-field unit (IFU) spectroscopic survey that one of three core programs in the fourth-generation Sloan Digital Sky Survey (SDSS-IV). With a spectral coverage 3622–10354 Å and average footprint ∼500 arcsec 2 per IFU scientific data products derived from MaNGA will permit exploration internal structure statistically large sample 10,000 low-redshift galaxies unprecedented detail. Comprising...
SDSS-V will be an all-sky, multi-epoch spectroscopic survey of over six million objects. It is designed to decode the history Milky Way, trace emergence chemical elements, reveal inner workings stars, and investigate origin planets. also create integral-field map gas in Galaxy Local Group that 1,000x larger than current state art at high enough spatial resolution self-regulation mechanisms galactic ecosystems. pioneer systematic, monitoring across whole sky, revealing changes on timescales...
We present the PHANGS-MUSE survey, a programme that uses MUSE integral field spectrograph at ESO VLT to map 19 massive (9.4 < log( M ⋆ / ⊙ )< 11.0) nearby ( D ≲ 20 Mpc) star-forming disc galaxies. The survey consists of 168 pointings (1′ by 1′ each) and total nearly 15 × 10 6 spectra, covering ∼1.5 independent spectra. provides first view star formation across different local environments (including galaxy centres, bars, spiral arms) in external galaxies median resolution 50 pc, better...
PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other multiwavelength data, dataset will provide unprecedented look into connections between young stars, HII regions, cold molecular gas in these nearby star-forming galaxies. Accurate distances are needed to transform measured observables physical parameters (e.g., brightness luminosity, angular sizes clouds, star clusters associations). has...
Abstract The PHANGS program is building the first data set to enable multiphase, multiscale study of star formation across nearby spiral galaxy population. This effort enabled by large survey programs with Atacama Large Millimeter/submillimeter Array (ALMA), MUSE on Very Telescope, and Hubble Space Telescope (HST), which we have obtained CO(2–1) imaging, optical spectroscopic mapping, high-resolution UV–optical respectively. Here, present PHANGS-HST, has NUV– U – B V I imaging disks 38...
We use integral field spectroscopy from the PHANGS–MUSE survey, which resolves ionised interstellar medium structure at ∼50 pc resolution in 19 nearby spiral galaxies, to study origin of diffuse gas (DIG). examine physical conditions by first removing morphologically defined H II regions and then binning low-surface-brightness areas achieve significant detections key nebular lines DIG. A simple model for leakage propagation ionising radiation is able reproduce observed distribution α This...
The PHANGS collaboration has been building a reference dataset for the multi-scale, multi-phase study of star formation and interstellar medium in nearby galaxies. With successful launch commissioning JWST, we can now obtain high-resolution infrared imaging to probe youngest stellar populations dust emission on scales clusters molecular clouds ($\sim$5-50 pc). In Cycle 1, is conducting an 8-band survey from 2-21$\mu$m 19 spiral CO(2-1) mapping, optical integral field spectroscopy, UV-optical...
We measure empirical relationships between the local star formation rate (SFR) and properties of star-forming molecular gas on 1.5 kpc scales across 80 nearby galaxies. These relationships, commonly referred to as "star laws," aim at predicting SFR surface density from various combinations density, galactic orbital time, cloud free-fall interstellar medium dynamical equilibrium pressure. Leveraging a multiwavelength database built for PHANGS survey, we these quantities consistently all...
Abstract The PHANGS project is assembling a comprehensive, multiwavelength data set of nearby (∼5–20 Mpc), massive star-forming galaxies to enable multiphase, multiscale investigations into the processes that drive star formation and galaxy evolution. To date, large survey programs have provided molecular gas (CO) cubes with Atacama Large Millimeter/submillimeter Array, optical integral field unit (IFU) spectroscopy Very Telescope/Multi-Unit Spectroscopic Explorer (MUSE), high-resolution...
We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample 162 Ly Alpha-Emitting (LAE) galaxies at z=3.1 discovered in deep narrow-band MUSYC imaging Extended Chandra Deep Field South. LAEs were selected to have observed frame equivalent widths >80A emission line fluxes >1.5E-17 erg/cm^2/s. Only 1% our LAE appears host AGN. The exhibit moderate spatial correlation length r_0=3.6+0.8-1.0 Mpc, corresponding bias factor b=1.7+0.3-0.4, which...
We selected 40 candidate Lyman Alpha Emitting galaxies (LAEs) at z ~=3.1 with observed frame equivalent widths >150A and inferred emission line fluxes >2.5x10^-17 ergs/cm^2/s from deep narrow-band broad-band MUSYC images of the Extended Chandra Deep Field South. Covering 992 sq. arcmin, this is largest ``blank field'' surveyed for LAEs ~3, allowing an improved estimate space density population 3+-1x10^-4 h_70^3/Mpc^3. Spectroscopic follow-up 23 candidates yielded 18 redshifts, all ~=3.1....