Search Publications
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 …
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…
Interplanetary Type IV Solar Radio Bursts: A Comprehensive Catalog and Statistical Results
Mohan, Atul; Gopalswamy, Nat; Kumari, Anshu +2 more
Decameter hectometric (DH; 1–14 MHz) type IV radio bursts are produced by flare-accelerated electrons trapped in postflare loops or the moving magnetic structures associated with the coronal mass ejections (CMEs). From a space weather perspective, it is important to systematically compile these bursts, explore their spectrotemporal characteristics…
HST Proper Motion of Andromeda III. Another Satellite Coorbiting the M31 Satellite Plane
Kozhurina-Platais, Vera; Casetti-Dinescu, Dana I.; Girard, Terrence M. +5 more
We measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr time baseline. The WFPC2 exposures have been processed using a deep-learning centering procedure recently developed as well as an improved astrometric calibration of the camera. T…
An Empirical Framework Characterizing the Metallicity and Star-formation History Dependence of X-Ray Binary Population Formation and Emission in Galaxies
Greene, Jenny E.; Oskinova, Lidia; Basu-Zych, Antara +12 more
We present a new empirical framework modeling the metallicity and star formation history (SFH) dependence of X-ray luminous (L ≳ 1036 erg s‑1) point-source population X-ray luminosity functions (XLFs) in normal galaxies. We expect that the X-ray point-source populations are dominated by X-ray binaries (XRBs), with contributio…
A New Dissociative Galaxy Cluster Merger: RM J150822.0+575515.2
Finner, Kyle; Wittman, David; Stancioli, Rodrigo +1 more
Galaxy cluster mergers that exhibit clear dissociation between their dark matter, intracluster gas, and stellar components are great laboratories for probing dark matter properties. Mergers that are binary and in the plane of the sky have the additional advantage of being simpler to model, allowing for a better understanding of the merger dynamics…
[O IV]- and [Ne V]-weak Active Galactic Nuclei Hidden by Compton-thick Material in Late Mergers
Imanishi, Masatoshi; Wada, Keiichi; Tanimoto, Atsushi +10 more
We study "buried" active galactic nuclei (AGNs) almost fully covered by circumnuclear material in ultra/luminous infrared galaxies (U/LIRGs), which show weak ionized lines from narrow-line regions. Employing an indicator of a [O IV] 25.89 or [Ne V] 14.32 µm line to 12 µm AGN luminosity ratio, we find 17 buried AGN candidates that are […
Gas-dynamical Mass Measurements of the Supermassive Black Holes in the Early-type Galaxies NGC 4786 and NGC 5193 from ALMA and HST Observations
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +10 more
We present molecular gas-dynamical mass measurements of the central black holes in the giant elliptical galaxies NGC 4786 and NGC 5193, based on CO (2‑1) observations from the Atacama Large Millimeter/submillimeter Array (ALMA) and Hubble Space Telescope near-infrared imaging. The central region in each galaxy contains a circumnuclear disk that ex…
The Outflowing [O II] Nebulae of Compact Starburst Galaxies at z ∼ 0.5
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +11 more
High-velocity outflows are ubiquitous in compact, massive (M * ∼ 1011 M ⊙), z ∼ 0.5 galaxies with extreme star formation surface densities (ΣSFR ∼ 2000 M ⊙ yr‑1 kpc‑2). We have previously detected and characterized these outflows using Mg II absorption lines. To probe the…
An Edge-on Regular Disk Galaxy at z = 5.289
Yan, Haojing; Ling, Chenxiaoji; Sun, Bangzheng
While rotation-supported gas disks are known to exist as early as at z ≈ 7, it is still a general belief that stellar disks form late in the Universe. This picture is now being challenged by the observations from the James Webb Space Telescope (JWST), which have revealed a large number of disk-like galaxies that could be at z > 3, with some bei…