Search Publications
A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s-1 Mpc-1 Uncertainty from the Hubble Space Telescope and the SH0ES Team
Casertano, Stefano; Filippenko, Alexei V.; Jones, David O. +15 more
We report observations from the Hubble Space Telescope (HST) of Cepheid variables in the host galaxies of 42 Type Ia supernovae (SNe Ia) used to calibrate the Hubble constant (H 0). These include the complete sample of all suitable SNe Ia discovered in the last four decades at redshift z ≤ 0.01, collected and calibrated from ≥1000 HST o…
The Pantheon+ Analysis: Cosmological Constraints
Filippenko, Alexei V.; Coulter, David A.; Foley, Ryan J. +45 more
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26. This work features an increased sample size from the addition of multiple cross-calibrated photometric systems of SNe covering an increased redshift span, and im…
Challenges for ΛCDM: An update
Perivolaropoulos, L.; Skara, F.
A number of challenges to the standard ΛCDM model have been emerging during the past few years as the accuracy of cosmological observations improves. In this review we discuss in a unified manner many existing signals in cosmological and astrophysical data that appear to be in some tension (2 σ or larger) with the standard ΛCDM model as specified …
The Pantheon+ Analysis: The Full Data Set and Light-curve Release
Filippenko, Alexei V.; Kilpatrick, Charles D.; Coulter, David A. +27 more
Here we present 1701 light curves of 1550 unique, spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the Supernovae and H 0 for the Equation of State of dark energy distance-ladder analysis. This effort is one part of a series of works that …
Euclid preparation. I. The Euclid Wide Survey
Aussel, H.; Cimatti, A.; Schultheis, M. +242 more
Euclid is a mission of the European Space Agency that is designed to constrain the properties of dark energy and gravity via weak gravitational lensing and galaxy clustering. It will carry out a wide area imaging and spectroscopy survey (the Euclid Wide Survey: EWS) in visible and near-infrared bands, covering approximately 15 000 deg2 …
Two Remarkably Luminous Galaxy Candidates at z ≈ 10-12 Revealed by JWST
Strait, Victoria; van Dokkum, Pieter; Conroy, Charlie +22 more
The first few 100 Myr at z > 10 mark the last major uncharted epoch in the history of the universe, where only a single galaxy (GN-z11 at z ≈ 11) is currently spectroscopically confirmed. Here we present a search for luminous z > 10 galaxies with JWST/NIRCam photometry spanning ≈1-5 µm and covering 49 arcmin2 from the public…
The LOFAR Two-metre Sky Survey. V. Second data release
Prandoni, I.; Zhang, X.; Di Gennaro, G. +103 more
In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30' and 1h00m +28°00' and spanning 4178 and 1457 square degrees respectively. The images were derived from 3451 h (7.6 PB) …
COSMOS2020: A Panchromatic View of the Universe to z∼10 from Two Complementary Catalogs
Aussel, H.; Sanders, D. B.; Ilbert, O. +55 more
The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This paper describes the collection, processing, and analysis of these new imaging data to produce a new reference photometric redsh…
A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging
Papovich, Casey; Cole, Justin W.; Yang, Guang +119 more
We report the discovery of a candidate galaxy with a photo-z of z ~ 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a robust z phot = ${11.8}_{-0.2}^{+0.3}$ (1σ uncertainty) with m F200W = 27.3 an…
Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
Juneau, S.; Moustakas, J.; Myers, Adam D. +267 more
The Dark Energy Spectroscopic Instrument (DESI) embarked on an ambitious 5 yr survey in 2021 May to explore the nature of dark energy with spectroscopic measurements of 40 million galaxies and quasars. DESI will determine precise redshifts and employ the baryon acoustic oscillation method to measure distances from the nearby universe to beyond red…