Search Publications
A New Sample of Transient Ultraluminous X-Ray Sources Serendipitously Discovered by Swift/XRT
Fürst, Felix; Middleton, Matthew J.; Walton, Dominic J. +11 more
Ultraluminous X-ray sources (ULXs) are our best laboratories for studying extreme super-Eddington accretion. Most studies of these objects are of relatively persistent sources; however, there is growing evidence to suggest a large fraction of these sources are transient. Here we present a sample of five newly reported transient ULXs in the galaxie…
The S-Web Origin of Composition Enhancement in the Slow-to-moderate Speed Solar Wind
Sun, X.; Lynch, B. J.; Lepri, S. T. +3 more
Connecting the solar wind observed throughout the heliosphere to its origins in the solar corona is one of the central aims of heliophysics. The variability in the magnetic field, bulk plasma, and heavy ion composition properties of the slow wind are thought to result from magnetic reconnection processes in the solar corona. We identify regions of…
Solar Radio Spikes and Type IIIb Striae Manifestations of Subsecond Electron Acceleration Triggered by a Coronal Mass Ejection
Kontar, Eduard P.; Vilmer, Nicole; Chen, Xingyao +3 more
Understanding electron acceleration associated with magnetic energy release at subsecond scales presents major challenges in solar physics. Solar radio spikes observed as subsecond, narrow-bandwidth bursts with Δf/f ~ 10-3-10-2 are indicative of a subsecond evolution of the electron distribution. We present a statistical anal…
Multistage Reconnection Powering a Solar Coronal Jet
Teriaca, Luca; Long, David M.; Berghmans, David +5 more
Coronal jets are short-lived eruptive features commonly observed in polar coronal holes and are thought to play a key role in the transfer of mass and energy into the solar corona. We describe unique contemporaneous observations of a coronal blowout jet seen by the Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft and the…
Untangling the Sources of Abundance Dispersion in Low-metallicity Stars
Weinberg, David H.; Johnson, Jennifer A.; Ilyin, Ilya +4 more
We measure abundances of 12 elements (Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni) in a sample of 86 metal-poor (-2 ≲ [Fe/H] ≲ -1) subgiant stars in the solar neighborhood. Abundances are derived from high-resolution spectra taken with the Potsdam Echelle Polarimetric and Spectroscopic Instrument on the Large Binocular Telescope, modeled using i…
CLEAR: Spatially Resolved Emission Lines and Active Galactic Nuclei at 0.6 < z < 1.3
Papovich, Casey; Cleri, Nikko J.; Holwerda, Benne W. +8 more
We investigate spatially resolved emission-line ratios in a sample of 219 galaxies (0.6 < z < 1.3) detected using the G102 grism on the Hubble Space Telescope Wide Field Camera 3 taken as part of the CANDELS Lyα Emission at Reionization survey to measure ionization profiles and search for low-luminosity active galactic nuclei (AGN). We analy…
Discovery of A Large-scale Bent Radio Jet in the Merging Cluster A514
Kale, Ruta; Lee, Wonki; ZuHone, John +3 more
We report a discovery of a large-scale bent radio jet in the merging galaxy cluster A514 (z = 0.071). The radio emission originates from the two radio lobes of the active galactic nucleus (AGN) located near the center of the southern subcluster and extends toward the southern outskirts with multiple bends. Its peculiar morphology is characterized …
Macrospicules and Their Connection to Magnetic Reconnection in the Lower Solar Atmosphere
Shen, Yuandeng; Zhou, Xinping; Duan, Yadan +4 more
Solar macrospicules are beam-like cool plasma ejections of size in between spicules and coronal jets, which can elucidate potential connections between plasma jetting activity at different scales. With high-resolution observations from the New Vacuum Solar Telescope and Solar Dynamics Observatory, we investigate the origin of five groups of recurr…
Constraining the White-dwarf Mass and Magnetic Field Strength of a New Intermediate Polar through X-Ray Observations
Hailey, Charles J.; Mori, Kaya; Ramsay, Gavin +9 more
We report timing and broadband spectral analysis of a Galactic X-ray source, CXOGBS J174517.0-321356 (J1745), with a 614 s periodicity. Chandra discovered the source in the direction of the Galactic Bulge. Gong proposed that J1745 was either an intermediate polar (IP) with a mass of ~1 M ⊙, or an ultracompact X-ray binary (UCXB). To con…
Comparing Globular Cluster System Properties with Host Galaxy Environment
Ma, Chung-Pei; Greene, Jenny E.; Blakeslee, John P. +2 more
We present Hubble Space Telescope photometry in the optical (F475X) and near-infrared (F110W) bands of the globular cluster (GC) systems of the inner halos of a sample of 15 massive elliptical galaxies. The targets are selected from the volume-limited MASSIVE survey, and chosen to sample a range of environments from sparsely populated groups to th…