Search Publications
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z = 6.2
Ouchi, Masami; Hutchison, Taylor A.; Larson, Rebecca L. +60 more
The gravitationally lensed star WHL 0137-LS, nicknamed Earendel, was identified with a photometric redshift z phot = 6.2 ± 0.1 based on images taken with the Hubble Space Telescope. Here we present James Webb Space Telescope (JWST) Near Infrared Camera images of Earendel in eight filters spanning 0.8-5.0 µm. In these higher-resolu…
Unveiling the Space Weather During the Starlink Satellites Destruction Event on 4 February 2022
Wang, Yuming; Luo, Bingxian; Li, Xiaolei +7 more
On 4 February 2022, 38 Starlink satellites were destroyed by the geomagnetic storm, which brought significant financial, aerospace and public influences. In this letter, we reveal the space weather process during 3-4 February 2022 geomagnetic disturbances, from the Sun all the way to the satellite orbiting atmosphere. Initiated by an M1.0 class fl…
Search of strong lens systems in the Dark Energy Survey using convolutional neural networks
Clément, B.; Courbin, F.; Joseph, R. +8 more
We present our search for strong lens, galaxy-scale systems in the first data release of the Dark Energy Survey (DES), based on a color-selected parent sample of 18 745 029 luminous red galaxies (LRGs). We used a convolutional neural network (CNN) to grade this LRG sample with values between 0 (non-lens) and 1 (lens). Our training set of mock lens…
Measuring the Milky Way mass distribution in the presence of the LMC
Vasiliev, Eugene; Correa Magnus, Lilia
The ongoing interaction between the Milky Way (MW) and its largest satellite - the Large Magellanic Cloud (LMC) - creates a significant perturbation in the distribution and kinematics of distant halo stars, globular clusters and satellite galaxies, and leads to biases in MW mass estimates from these tracer populations. We present a method for comp…
3D Selection of 167 Substellar Companions to Nearby Stars
Butler, R. Paul; Vogt, Steven S.; Oppenheimer, Rebecca +20 more
We analyze 5108 AFGKM stars with at least five high-precision radial velocity points, as well as Gaia and Hipparcos astrometric data, utilizing a novel pipeline developed in previous work. We find 914 radial velocity signals with periods longer than 1000 days. Around these signals, 167 cold giants and 68 other types of companions are identified, t…
The Coma Cluster at LOFAR Frequencies. II. The Halo, Relic, and a New Accretion Relic
Simionescu, A.; Zhang, X.; Brunetti, G. +26 more
We present LOw Frequency ARray observations of the Coma Cluster field at 144 MHz. The cluster hosts one of the most famous radio halos, a relic, and a low surface brightness bridge. We detect new features that allow us to make a step forward in the understanding of particle acceleration in clusters. The radio halo extends for more than 2 Mpc, whic…
Euclid preparation. XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields
Cimatti, A.; Sanders, D. B.; Ilbert, O. +195 more
We present a new infrared survey covering the three Euclid deep fields and four other Euclid calibration fields using Spitzer Space Telescope's Infrared Array Camera (IRAC). We combined these new observations with all relevant IRAC archival data of these fields in order to produce the deepest possible mosaics of these regions. In total, these obse…
Continuum reverberation mapping and a new lag-luminosity relationship for AGN
Netzer, Hagai
High cadence, high quality observations of active galactic nuclei (AGN) clearly show continuum variations with lags, relative to the shortest observed variable UV continuum that increase with wavelength ('lag spectra'). These have been attributed to the irradiation and heating of the central accretion disc by the central X-ray emitting corona. An …
Milky Way's Eccentric Constituents with Gaia, APOGEE, and GALAH
Caldwell, Nelson; Myeong, G. C.; Belokurov, Vasily +3 more
We report the results of an unsupervised decomposition of the local stellar halo in the chemodynamical space spanned by the abundance measurements from APOGEE DR17 and GALAH DR3. In our Gaussian mixture model, only four independent components dominate the halo in the solar neighborhood, three previously known, Aurora, Splash, and Gaia-Sausage/Ence…
The X-Ray Polarization View of Mrk 421 in an Average Flux State as Observed by the Imaging X-Ray Polarimetry Explorer
Wu, Kinwah; Enoto, Teruaki; Turolla, Roberto +100 more
Particle acceleration mechanisms in supermassive black hole jets, such as shock acceleration, magnetic reconnection, and turbulence, are expected to have observable signatures in the multiwavelength polarization properties of blazars. The recent launch of the Imaging X-Ray Polarimetry Explorer (IXPE) enables us, for the first time, to use polariza…