Search Publications
SPYGLASS. V. Spatially and Temporally Structured Star-forming Environments in the Cepheus-Hercules Complex
Kraus, Adam L.; Bouma, Luke G.; Kerr, Ronan +2 more
Young associations record complete histories of star-forming events through their demographics and dynamics, and Gaia has greatly expanded our knowledge of these associations. We present the first structural and dynamical overview study of the Cep-Her Complex, which has recently emerged as the largest stellar population within 500 pc that still la…
An Image-based Search for Pulsar Candidates in the MeerKAT Bulge Survey
Calore, Francesca; Kaplan, David L.; Clavel, Maïca +13 more
We report on the results of an image-based search for pulsar candidates toward the Galactic bulge. We used mosaic images from the MeerKAT radio telescope that were taken as part of a 173 deg2 survey of the bulge and Galactic center of our Galaxy at L band (856–1712 MHz) in all four Stokes I, Q, U, and V. The image rms noise levels of 12…
Observational Evidence for Hot Wind Impact on Parsec Scales in Low-luminosity Active Galactic Nuclei
Li, Zhiyuan; Shi, Fangzheng; Yuan, Feng +2 more
Supermassive black holes in galaxies spend the majority of their lifetime in the low-luminosity regime, powered by hot accretion flow. Strong winds launched from the hot accretion flow have the potential to play an important role in active galactic nuclei (AGN) feedback. Direct observational evidence for these hot winds with temperatures around 10…
Updated Spectral Characteristics for the Ultracool Dwarf TRAPPIST-1
Burgasser, Adam J.; Davoudi, Fatemeh; Rackham, Benjamin V. +5 more
A comprehensive infrared spectroscopic study of star TRAPPIST-1 is a crucial step toward the detailed examination of its planets. While the presence of Earth's atmosphere has limited the spectral extent of such a study up to now, the Near Infrared Imager and Slitless Spectrograph (NIRISS) and the Near Infrared Spectrograph instruments aboard the J…
Searching for Evidence of Subchromospheric Magnetic Reconnection on the Sun
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +13 more
Within the coronae of stars, abundances of those elements with low first ionization potential (FIP) often differ from their photospheric values. The coronae of the Sun and solar-type stars mostly show enhancements of low-FIP elements (the FIP effect) while more active stars such as M dwarfs have coronae generally characterized by the inverse-FIP (…
Ionized Carbon in Galaxies: The [C II] 158 µm Line as a Total Molecular Gas Mass Tracer Revisited
Zhang, Zhi-Yu; Zhao, Yinghe; Liu, Jiamin +1 more
In this paper, we present a statistical study of the [C II] 158 µm line and the CO(1‑0) emission for a sample of ∼200 local and high-z (32 sources with z > 1) galaxies with very different physical conditions. We explore the correlation between the luminosities of [C II] and CO(1‑0) lines and obtain a strong linear relationship, confirming…
Forecasting Constraints from Surface Brightness Fluctuations in Galaxy Clusters
Romero, Charles E.
Studies of surface brightness (SB) fluctuations in the intracluster medium present an indirect estimate of turbulent pressure support and associated Mach numbers. While high-resolution X-ray spectroscopy can directly constrain line-of-sight gas motions, including those due to turbulence, such observations are relatively expensive and will be limit…
Formation and Eruption of a Hot Channel Magnetic Flux Rope in a Nested Double Null Magnetic System
Yao, Surui; Shen, Yuandeng; Zhou, Chengrui +2 more
The coronal magnetic topology significantly affects the outcome of magnetic flux rope (MFR) eruptions. The recently reported nested double null magnetic system remains unclear as to how it affects MFR eruptions. Using observations from the New Vacuum Solar Telescope and the Solar Dynamics Observatory, we studied the formation and successful erupti…
Dust-obscured Galaxies in the XMM-SERVS Fields: Selection, Multiwavelength Characterization, and Physical Nature
Brandt, W. N.; Yu, Zhibo; Zou, Fan +7 more
Dust-obscured galaxies (DOGs) are enshrouded by dust and many are believed to host accreting supermassive black holes (SMBHs), which makes them unique objects for probing the coevolution of galaxies and SMBHs. We select and characterize DOGs in the 13 deg2 XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS), leveraging th…
Solar Flare Ribbon Fronts. II. Evolution of Heating Rates in Individual Flare Footpoints
Polito, Vanessa; Xu, Yan; Kerr, Graham S. +1 more
Solar flare ribbon fronts appear ahead of the bright structures that normally characterize solar flares, and can persist for an extended period of time in spatially localized patches before transitioning to "regular" bright ribbons. They likely represent the initial onset of flare energy deposition into the chromosphere. Chromospheric spectra (e.g…