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JWST photometry of globular cluster populations in Abell 2744 at z = 0.3
Harris, William E.; Reina-Campos, Marta
JWST imaging of the rich galaxy cluster Abell 2744 at z = 0.308 has been used by the UNCOVER team to construct mosaic images in the NIRCam filters. The exceptionally deep images in the (F115W, F150W, and F200W) bands reveal a large population of unresolved point-like sources across the field, the vast majority of which are globular clusters (GCs) …
A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R < 50 au New Horizons-LORRI Data
Cooray, Asantha; Zemcov, Michael; Symons, Teresa +2 more
Direct photometric measurements of the cosmic optical background (COB) provide an important point of comparison to both other measurement methodologies and models of cosmic structure formation, and permit a cosmic consistency test with the potential to reveal additional diffuse sources of emission. The COB has been challenging to measure from Eart…
Magnetic Activity Evolution of Solar-like Stars. I. S ph-Age Relation Derived from Kepler Observations
van Saders, Jennifer; García, Rafael A.; Breton, Sylvain N. +9 more
The ages of solar-like stars have been at the center of many studies such as exoplanet characterization or Galactic-archeology. While ages are usually computed from stellar evolution models, relations linking ages to other stellar properties, such as rotation and magnetic activity, have been investigated. With the large catalog of 55,232 rotation …
A New Study on a Type Iax Stellar Remnant and its Probable Association with SN 1181
Hillier, D. John; Parker, Quentin A.; Ritter, Andreas +4 more
We report observations and modeling of the stellar remnant and presumed double-degenerate merger of Type Iax supernova Pa 30, which is the probable remnant of SN 1181 AD. It is the only known bound stellar SN remnant and the only star with Wolf-Rayet features that is neither a planetary nebula central star nor a massive Population I progenitor. We…
The CGM2 Survey: Quenching and the Transformation of the Circumgalactic Medium
Tripp, Todd M.; Prochaska, J. Xavier; Tejos, Nicolas +9 more
This study addresses how the incidence rate of strong O VI absorbers in a galaxy's circumgalactic medium (CGM) depends on galaxy mass and, independently, on the amount of star formation in the galaxy. We use Hubble Space Telescope/Cosmic Origins Spectrograph absorption spectroscopy of quasars to measure O VI absorption within 400 projected kpc and…
Analysis of the Young Open Cluster Trumpler 2 Using Gaia DR3 Data
Yontan, Talar; Tasdemir, Seval
We present an investigation of the open cluster Trumpler 2 using Gaia DR3 photometric, astrometric and spectroscopic data. 92 stars were identified as likely members of the cluster, with membership probabilities greater than 0.5. The mean proper-motion components of the cluster are derived as ($\mu_{\alpha}\cos \delta$, $\mu_{\delta}$)=($1.494 \pm…
The first catalogue of spectroscopically confirmed red nuggets at z ∼ 0.7 from the VIPERS survey. Linking high-z red nuggets and local relics
Pollo, Agnieszka; Małek, Katarzyna; Siudek, Małgorzata +4 more
Context. Red nuggets are a rare population of passive compact massive galaxies thought to be the first massive galaxies that formed in the Universe. First found at z ∼ 3, they are even less abundant at lower redshifts, and it is believed that with time they mostly transformed through mergers into today's giant ellipticals. The red nuggets that man…
The Positron Puzzle
Siegert, Thomas
The Positron Puzzle is a half-century old conundrum about the origin of the Galactic
Mineralogy, Morphology, and Emplacement History of the Maaz Formation on the Jezero Crater Floor From Orbital and Rover Observations
Liu, Yang; Horgan, Briony; Ravanis, Eleni +42 more
The first samples collected by the Perseverance rover on the Mars 2020 mission were from the Maaz formation, a lava plain that covers most of the floor of Jezero crater. Laboratory analysis of these samples back on Earth would provide important constraints on the petrologic history, aqueous processes, and timing of key events in Jezero crater. How…
Search for lithium-rich giants in 32 open clusters with high-resolution spectroscopy★
Pancino, E.; Bossini, D.; Sousa, S. G. +3 more
Context. Lithium-rich giant stars are rare and their existence poses a challenge to our understanding of stellar structure and evolution. In particular, open clusters aptly constrain the mass and age of their members, offering a unique opportunity to understand the evolutionary stage where Li enrichment occurs.
Aims: We take advantage of the …