Search Publications
Constraining the Excitation of Molecular Gas in Two Quasar-starburst Systems at z ∼ 6
Fan, Xiaohui; Neri, Roberto; Menten, Karl M. +15 more
We present NOrthern Extended Millimeter Array observations of CO(8–7), (9–8), and (10–9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J2054-0005 at z = 6.0389 and SDSS J0129-0035 at z = 5.7788. Both quasars were previously detected in CO (2–1) and (6–5) transitions, making them candidates for studying the …
IS⊙IS Solar γ-Ray Measurements: Initial Observations and Calibrations
Mitchell, D. G.; McComas, D. J.; Mitchell, J. G. +13 more
High-energy neutral solar radiation in the form of γ-rays and neutrons is produced as secondary products in solar flares. The characteristics of this emission can provide key information regarding the energization of charged particles, particularly when primary particles remain trapped in the corona. The Integrated Science Investigation of the Sun…
MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision
Law, David R.; Chen, Christine H.; Hines, Dean C. +17 more
Modeling observations of the archetypal debris disk around β Pic, obtained in 2023 January with the MIRI Medium Resolution Spectrograph on board JWST, reveals significant differences compared with that obtained with the Infrared Spectrograph on board Spitzer. The bright 5–15 µm continuum excess modeled using a ∼600 K black body has disappear…
Disk Turbulence and Star Formation Regulation in High-z Main-sequence Analog Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +7 more
The gas-phase velocity dispersions in disk galaxies, which trace turbulence in the interstellar medium, are observed to increase with lookback time. However, the mechanisms that set this rise in turbulence are observationally poorly constrained. To address this, we combine kiloparsec-scale Atacama Large Millimeter/submillimeter Array observations …
Prediction of Astrometric and Timing Microlensing Events with Pulsars by ATNF Catalog and Gaia DR3
Xie, Yi; Lu, Xu
Determining the mass of neutron stars is crucial for understanding their formation, evolution, and interior structure. Currently, only a few dozen neutron stars have had their masses measured, and most of them belong to binary systems. However, there are a huge number of isolated neutron stars with unknown masses. Microlensing events with neutron …
Solar Energetic Particle and the Heliospheric Current Sheet
Wu, Chin-Chun; Liou, Kan
The effect of the heliospheric current sheet (HCS) on the propagation of solar energetic particles (SEPs) remains poorly known. In this study we address this question by surveying energetic (∼2.0–9.6 MeV nucleon–1) helium data acquired by the energetic particle acceleration, composition, and transport (EPACT) sensor on board the Wind sp…
A Panchromatic Study of the X-Ray Binary Population in NGC 300 on Subgalactic Scales
Williams, Benjamin F.; Eracleous, Michael; Binder, Breanna A. +3 more
The population-wide properties and demographics of extragalactic X-ray binaries (XRBs) correlate with the star formation rates (SFRs), stellar masses (M ⋆), and environmental factors (such as metallicity, Z) of their host galaxy. Although there is evidence that XRB scaling relations (L X/SFR for high-mass XRBs (HMXBs) and L <…
First Resolution of Microlensed Images of a Binary-lens Event
Tan, Thiam-Guan; Thompson, I. B.; Le Bouquin, Jean-Baptiste +72 more
We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysis, but the joint modeling with the VLTI data breaks several degeneracies, arriving at a strongly favored solut…
The Radial Interplanetary Field Strength at Sunspot Minimum as Polar Field Proxy and Solar Cycle Predictor
Wang, Y. -M.
The minimum value of the geomagnetic aa index has served as a remarkably successful predictor of solar cycle amplitude. This value is reached near or just after sunspot minimum, when both the near-Earth solar wind speed and interplanetary magnetic field (IMF) strength fall to their lowest values. At this time, the heliospheric current sheet is fla…
Pulsation in TESS Objects of Interest
Janot-Pacheco, E.; Ferreira Lopes, C. E.; De Medeiros, J. R. +11 more
We report the discovery of three Transiting Exoplanet Survey Satellite Objects of Interest (TOI) with signatures of pulsation, observed in more than one sector. Our main goal is to explore how large is the variety of classical pulsators such as δ Sct, γ Dor, RR Lyrae and Cepheid among TOI pulsators. The analysis reveals two stars with signatures o…