Search Publications
Circumnuclear Dust in Luminous Early-type Galaxies. I. Sample Properties and Stellar Luminosity Models
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +8 more
Dusty circumnuclear disks (CNDs) in luminous early-type galaxies (ETGs) show regular, dynamically cold molecular gas kinematics. For a growing number of ETGs, Atacama Large Millimeter/sub-millimeter Array (ALMA) CO imaging and detailed gas-dynamical modeling facilitate moderate-to-high precision black hole (BH) mass (M BH) determination…
Dynamical Masses for the Hyades Binary System vB 120
Torres, Guillermo; Latham, David W.; Stefanik, Robert P.
We report spectroscopic observations of vB 120 (HD 30712), a 5.7 yr astrometric-spectroscopic binary system in the Hyades cluster. We combine our radial velocities with others from the literature, and with existing speckle interferometry measurements, to derive an improved 3D orbit for the system. We infer component masses of M 1 = 1.06…
Exploration of Halo Substructures in Integrals-of-motion Space with Gaia Data Release 3
Ye, Dashuang; Du, Cuihua; Deng, Mingji +2 more
Using kinematic data from the Gaia Data Release 3 catalog, along with metallicity estimates robustly derived from Gaia BP/RP spectra, we have explored the Galactic stellar halo in search of both known and potentially new substructures. By applying the Hierarchical Density-Based Spatial Clustering of Applications with Noise clustering algorithm in …
XMM–NuSTAR Observation and Multiwavelength Spectral Energy Distribution Modeling of Blazar 4FGL J1520.8–0348
Ajello, M.; Tramacere, A.; Marcotulli, L. +1 more
Active galactic nuclei (AGNs) can power relativistic jets, which are called blazars when pointed close to our line of sight. Depending on the presence or absence of emission lines in their optical spectra, blazars are categorized into flat spectrum radio quasars (FSRQs) or BL Lacertae (BL Lac) objects. According to the "blazar sequence," as synchr…
The Detection of Possible Quasiperiodic Oscillations in the BL Lac 4FGL J2139.4‑4235
Gong, Yunlu; Gao, Quangui; Li, Xiaopan +9 more
We present periodicity search analyses on the long-term γ-ray light curve of the BL Lacertae object 4FGL J2139.4‑4235 observed by the Fermi Large Area Telescope, over a period of more than 15 yr, from 2008 August 4 to 2023 December 10. To determine the quasiperiodic oscillation (QPO) behavior of 4FGL J2139.4‑4235 in the 0.3–300 GeV energy range, w…
On the Response of the Transition Region and the Corona to Rapid Excursions in the Chromosphere
Pereira, T. M. D.; Mathew, S. K.; Louis, R. E. +2 more
Spicules are the thin hair/grass-like structures that are prominently observed at the chromospheric solar limb. It is believed that fibrils and rapid blueshifted and redshifted excursions (RBEs and RREs; collectively referred to as REs) correspond to on-disk counterparts of type I spicules and type II spicules, respectively. Our investigation focu…
PEARLS: Discovery of Point-source Features within Galaxies in the North Ecliptic Pole Time Domain Field
Grogin, Norman A.; Hathi, Nimish P.; Holwerda, Benne W. +36 more
The first public 0.9–4.4 µm NIRCam images of the North Ecliptic Pole Time Domain Field uncovered galaxies displaying point-source features in their cores as seen in the longer-wavelength filters. We visually identified a sample of 66 galaxies (∼1 galaxy arcmin–2) with pointlike cores and have modeled their two-dimensional light pr…
Exploring the Origin of Cold Gas and Star Formation in a Rare Population of Strongly Bulge-dominated Early-type Galaxies
Lin, Zesen; Kong, Xu; Zhang, Chuan-Peng +7 more
We analyze the properties of a rare population, the strongly bulge-dominated early-type galaxies (sBDEs) with significant H I gas, using the databases from the FAST All Sky H I survey (FASHI) and the Arecibo Legacy Fast ALFA (ALFALFA) survey. We select the sBDEs from the Sloan Digital Sky Survey and crossmatch with the FASHI-ALFALFA combined H I s…
JWST NIRCam Photometry: A Study of Globular Clusters Surrounding Bright Elliptical Galaxy VV 191a at z = 0.0513
Grogin, Norman A.; Holwerda, Benne W.; Koekemoer, Anton M. +22 more
James Webb Space Telescope NIRCam images have revealed 154 reliable globular cluster (GC) candidates around the z = 0.0513 elliptical galaxy VV 191a after subtracting 34 likely interlopers from background galaxies inside our search area. NIRCam broadband observations are made at 0.9–4.5 µm using the F090W, F150W, F356W, and F444W filters. Us…
A Broadband X-Ray Investigation of Fast-spinning Intermediate Polar CTCV J2056–3014
Hailey, Charles J.; Mori, Kaya; Ramsay, Gavin +5 more
We report on XMM-Newton, NuSTAR, and NICER X-ray observations of CTCV J2056–3014, a cataclysmic variable (CV) with one of the fastest-spinning white dwarfs (WDs) at P = 29.6 s. While previously classified as an intermediate polar, CJ2056 also exhibits the properties of WZ Sge–type CVs, such as dwarf novae and superoutbursts. With XMM-Newton and NI…