Search Publications
Astroparticles from X-Ray Binary Coronae
Gallagher, John S.; Fang, K.; Halzen, Francis +1 more
The recent observation of high-energy neutrinos from the Galactic plane implies an abundant population of hadronic cosmic-ray sources in the Milky Way. We explore the role of the coronae of accreting stellar-mass black holes as such astroparticle emitters. We show that the particle acceleration and interaction timescales in the coronal region are …
Filament Eruption from Active Region 13283 Leading to a Fast Halo-CME and an Intense Geomagnetic Storm on 2023 April 23
Vemareddy, P.
Using multi-instrument and multiwavelength observations, we studied a coronal mass ejection (CME) that led to an intense geomagnetic storm on 2023 April 23. The eruption occurred on April 21 in solar active region (AR) 13283 near the disk center. The AR was in its decay stage, with fragmented polarities and a preexisting long filament channel a fe…
A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations
Fu, Guangwei; Stevenson, Kevin B.; Bieryla, Allyson +49 more
Kepler-51 is a ≲1 Gyr old Sun-like star hosting three transiting planets with radii ≈6–9 R ⊕ and orbital periods ≈45–130 days. Transit timing variations (TTVs) measured with past Kepler and Hubble Space Telescope (HST) observations have been successfully modeled by considering gravitational interactions between the three transiting plan…
Transverse clues on the kiloparsec-scale structure of the circumgalactic medium as traced by C IV absorption
Bayliss, M. B.; Lopez, S.; Tejos, N. +13 more
The kiloparsec-scale kinematics and density structure of the circumgalactic medium (CGM) is still poorly constrained observationally, which poses a problem for understanding the role of the baryon cycle in galaxy evolution. Here we present VLT/MUSE integral-field spectroscopy (R ≈ 1800) of four giant gravitational arcs exhibiting W0 ≳ 0…
Fine structure in the Sigma Orionis cluster revealed by Gaia DR3
Martín, E. L.; Žerjal, M.; Pérez-Garrido, A.
Context. Sigma Orionis is an open cluster in the nearest giant star formation site - Orion. Its youth (3−5 Myr), low reddening, and relative vicinity make it an important benchmark cluster to study stellar and substellar formation and evolution.
Aims: Young star-forming sites are complex and hierarchical. Precision astrometry from Gaia DR3 en…
Methodological refinement of the submillimeter galaxy magnification bias. I. Cosmological analysis with a single redshift bin
Bonavera, L.; González-Nuevo, J.; Lapi, A. +3 more
Aims: The main goal of this work is to test the results of a methodological improvement in the measurement of the magnification bias signal on a sample of submillimeter galaxies. In particular, we investigate the constraining power of cosmological parameters within the ΛCDM model. We also discuss important points that can affect the results. …
Insights into the Galactic Bulge Chemodynamical Properties from Gaia Data Release 3
Marinacci, Federico; Fragkoudi, Francesca; Shen, Juntai +4 more
We explore the chemodynamical properties of the Galaxy in the azimuthal velocity V ϕ and metallicity [Fe/H] space using red giant stars from Gaia Data Release 3. The row-normalized V ϕ –[Fe/H] maps form a coherent sequence from the bulge to the outer disk, clearly revealing the thin/thick disk and the Splash. The metal-ric…
Trojan Globular Clusters: Radial Migration via Trapping in Bar Resonances
Belokurov, Vasily; Monty, Stephanie; Evans, N. Wyn +1 more
We search for globular clusters (GCs) trapped in resonances with the bar of the Milky Way (MW). By integrating their orbits in a potential with a decelerating bar, we select 10 whose orbits are significantly changed by its presence. Most of these are trapped in the corotation resonance, including M22 and 47 Tuc. The decelerating bar is capable of …
The GLASS-JWST Early Release Science Program: IV. Data release of 263 spectra from 245 unique sources
Vulcani, B.; Bradač, M.; Brammer, G. +24 more
We release fully reduced spectra obtained with NIRSpec onboard JWST as part of the GLASS-JWST Early Release Science Program and a follow-up Director's Discretionary Time program 2756. From these 263 spectra of 245 unique sources, acquired with low (R = 30–300) and high dispersion (R ~ 2700) gratings, we derive redshifts for 200 unique sources in t…
Substructures within Substructures in the Complex Postmerging System A514 Unveiled by High-resolution Magellan/Megacam Weak Lensing
Jee, M. James; Lee, Wonki; ZuHone, John +2 more
Abell 514 (A514) at z = 0.071 is an intriguing merging system exhibiting highly elongated (∼1 Mpc) X-ray features and three large-scale (300 ∼ 500 kpc) bent radio jets. To dissect this system with its multiwavelength data, it is critical to robustly identify and quantify its dark matter substructures. We present a weak-lensing analysis of A514 usi…