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Reconstructing the Disrupted Dwarf Galaxy Gaia-Sausage/Enceladus Using Its Stars and Globular Clusters
Limberg, Guilherme; Rossi, Silvia; Perottoni, Hélio D. +3 more
We combine spectroscopic, photometric, and astrometric information from APOGEE data release 17 and Gaia early data release 3 to perform a self-consistent characterization of Gaia-Sausage/Enceladus (GSE), the remnant of the last major merger experienced by the Milky Way, considering stars and globular clusters (GCs) altogether. Our novel set of che…
The Sparkler: Evolved High-redshift Globular Cluster Candidates Captured by JWST
Ravindranath, Swara; Willott, Chris J.; Martis, Nicholas S. +16 more
Using data from JWST, we analyse the compact sources ("sparkles") located around a remarkable z spec = 1.378 galaxy (the 'Sparkler) that is strongly gravitationally lensed by the z = 0.39 galaxy cluster SMACS J0723.3-7327. Several of these compact sources can be cross-identified in multiple images, making it clear that they are associat…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion Catalogs and Internal Kinematics
Milone, Antonino P.; Vesperini, Enrico; Anderson, Jay +17 more
A number of studies based on the data collected by the Hubble Space Telescope (HST) GO-13297 program "HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation" have investigated the photometric properties of a large sample of Galactic globular clusters and revolutionized our understanding of their stell…
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…