Search Publications
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…
A Repeating Fast Radio Burst Source in a Low-luminosity Dwarf Galaxy
Bhandari, Shivani; Kaspi, Victoria M.; Cognard, Ismaël +52 more
We present the localization and host galaxy of FRB 20190208A, a repeating source of fast radio bursts (FRBs) discovered using CHIME/FRB. As part of the Pinpointing REpeating ChIme Sources with EVN dishes repeater localization program on the European VLBI Network (EVN), we monitored FRB 20190208A for 65.6 hr at ∼1.4 GHz and detected a single burst,…
The Resolved Star Formation Law in NGC 7469 from JWST, ALMA, and VLA
Fiore, Fabrizio; Lapi, Andrea; Salvestrini, Francesco +4 more
We investigate the star formation process within the central 3.3 kpc region of the nearby luminous infrared Seyfert NGC 7469, probing scales ranging from 88 to 330 pc. We combine JWST/MIRI imaging with the F770W filter, with CO(2 – 1) and the underlying 1.3 mm dust continuum data from the Atacama Large Millimeter/submillimeter Array, along with Ka…
Solar Wind Structures from the Gaussianity of Magnetic Magnitude
Velli, Marco; Matteini, Lorenzo; Sioulas, Nikos +9 more
The heliosphere is permeated with highly structured solar wind originating from the Sun. One of the primary science objectives of Parker Solar Probe (PSP) is to determine the structures and dynamics of the plasma and magnetic fields at the sources of the solar wind. However, establishing the connection between in situ measurements and structures a…
Discovery of Astrometric Accelerations by Dark Companions in the Globular Cluster ω Centauri
Kamann, Sebastian; Girardi, Léo; Kozhurina-Platais, Vera +6 more
We present results from the search for astrometric accelerations of stars in ω Centauri using 13 yr of regularly scheduled Hubble Space Telescope WFC3/UVIS calibration observations in the cluster core. The high-precision astrometry of ∼160,000 sources was searched for significant deviations from linear proper motion. This led to the discovery of f…