Search Publications
A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey
Kobayashi, Naoto; Arimatsu, Ko; Tominaga, Nozomu +15 more
The population of optical transients evolving within a time-scale of a few hours or a day (so-called fast optical transients, FOTs) has recently been debated extensively. In particular, our understanding of extragalactic FOTs and their rates is limited. We present a search for extragalactic FOTs with the Tomo-e Gozen high-cadence survey. Using the…
ALMA-LEGUS. I. The Influence of Galaxy Morphology on Molecular Cloud Properties
Grebel, Eva K.; Smith, Linda J.; Aloisi, Alessandra +24 more
We present a comparative study of the molecular gas in two galaxies from the Legacy ExtraGalactic UV Survey (LEGUS) sample: barred spiral NGC 1313 and flocculent spiral NGC 7793. These two galaxies have similar masses, metallicities, and star formation rates, but NGC 1313 is forming significantly more massive star clusters than NGC 7793, especiall…
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…
Spatially resolved plasma composition evolution in a solar flare – The effect of reconnection outflow
Long, David M.; Brooks, David H.; Baker, Deborah +6 more
Context. Solar flares exhibit complex variations in elemental abundances compared to photospheric values. These abundance variations, characterized by the first ionization potential (FIP) bias, remain challenging to interpret. Aims. We aim to (1) examine the spatial and temporal evolution of coronal abundances in the X8.2 flare on 2017 September 1…
Water-Ice Dominated Spectra of Saturn's Rings and Small Moons From JWST
Fletcher, L. N.; Hedman, M. M.; Showalter, M. R. +11 more
JWST measured the infrared spectra of Saturn's rings and several of its small moons (Epimetheus, Pandora, Telesto, and Pallene) as part of Guaranteed Time Observation program 1247. The NIRSpec instrument obtained near-infrared spectra of the small moons between 0.6 and 5.3 microns, which are all dominated by water-ice absorption bands. The shapes …
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…
A fast-rotating blue straggler star in the tidal tail of the open cluster NGC 752
Chen, Li; Zhong, Jing; Qin, Songmei +3 more
Context. NGC 752 is a well-known Galactic open cluster of intermediate age. In recent works, a very long and asymmetric tail was revealed. A blue straggler star (BSS) at the periphery of the tidal tail of the cluster was subsequently identified.
Aims: We aim to perform a detailed analysis of the newly detected BSS based on the available compr…
Ytterbium atom interferometry for dark matter searches
Zhou, Yifan; Ranson, Rowan; Panagiotou, Michalis +1 more
We analyze the projected sensitivity of a laboratory-scale ytterbium atom interferometer to scalar, vector, and pseudoscalar dark matter signals. A frequency ratio measurement between two transitions in
Cosmic-ray diffusion in two local filamentary clouds
Grenier, I. A.; Kamal Youssef, F. R.
Context. Hadronic interactions between cosmic rays (CRs) and interstellar gas have been probed in γ rays across the Galaxy. A fairly uniform CR distribution is observed up to a few hundred parsecs from the Sun, except in the Eridu cloud, which shows an unexplained 30-50% deficit in GeV to TeV CR flux.
Aims: To explore the origin of this defic…
Study on Test-Mass Charging for Taiji Gravitational Wave Observatory
Han, Ruilong; Cai, Minghui; Yang, Tao +8 more
Taiji is proposed as a space-based gravitational wave (GW) observatory consisting of three spacecraft in a heliocentric orbit meanwhile with the distance of 3 million kilometers ahead of the Earth at about 20°. Free-falling test masses (TMs) are a key component of the interferometer for space-based GW detection in the 0.1mHz-1 Hz frequency range. …