Search Publications
Signatures of Active Galactic Nucleus Feedback Modes: A Green Bean Galaxy with 150 kpc Jet-induced Radio Emission
Prescott, Moire K. M.; Kapińska, Anna D.; Sanderson, Kelly N. +4 more
Jetted active galactic nuclei (AGN) hosting extended photoionized nebulae provide us with a unique view of the timescales associated with AGN activity. Here, we present a new green bean galaxy at z = 0.304458 ± 0.000007 with large-scale jet-induced radio emission. The spectral energy distributions of the radio components show steep spectral indice…
Absence of nebular He II λ4686 constrains the UV emission from the ultraluminous X-ray pulsar NGC 1313 X-2
Castro Segura, N.; Soria, R.; Middleton, M. +1 more
While much has been learned in recent decades about the X-ray emission of the extragalactic ultraluminous X-ray sources (ULXs), their radiative output in the ultraviolet (UV) band remains poorly constrained. Understanding of the full ULX spectral energy distribution (SED) is imperative to constrain the accretion flow geometry powering them, as wel…
Swift X-ray and UV observations of six Gaia binaries supposedly containing a neutron star
Sbarufatti, B.; Mereghetti, S.; Rea, N. +3 more
Recent observations have led to the discovery of numerous optically selected binaries containing an undetected component with mass consistent with a compact object (neutron star (NS) or white dwarf). Using the Neil Gehrels Swift Observatory, we carried out X-ray and UV observations of a small sample of these binaries. Four systems are wide (with a…
Evolution of spin in the intermediate polar CC sculptoris
Knigge, C.; Scaringi, S.; Castro Segura, N. +6 more
We report on spin variations in the intermediate polar and cataclysmic variable CC Scl, as seen by the Transiting Exoplanet Survey Satellite (TESS). By studying both the spin period and its harmonic, we find that the spin has varied since it was first observed in 2011. We find the latest spin value for the source to be 389.473(6) s, equivalent to …
A refined search for high-velocity gas in the Cygnus Loop supernova remnant
Ritchey, Adam M.; Federman, S. R.; Lambert, David L.
We present the results of a sensitive search for high-velocity gas in interstellar absorption lines associated with the Cygnus Loop supernova remnant (SNR). We examine high-resolution high signal-to-noise ratio optical spectra of six stars in the Cygnus Loop region with distances greater than ~700 pc. All stars show low-velocity Na I and Ca II abs…
Probing Turbulent Scattering Effects on Suprathermal Electrons in the Solar Wind: Modeling, Observations, and Implications
Maksimovic, Milan; Kasper, Justin C.; Kontar, Eduard P. +7 more
This study explores the impact of a turbulent scattering mechanism, akin to those influencing solar and galactic cosmic rays propagating in the interplanetary medium, on the population of suprathermal electrons in the solar wind. We employ a Fokker–Planck equation to model the radial evolution of electron pitch angle distributions under the action…
H3+ absorption and emission in local (U)LIRGs with JWST/NIRSpec: Evidence for high H2 ionization rates
Perna, Michele; Lamperti, Isabella; González-Alfonso, Eduardo +6 more
We study the 3.4 ‑ 4.4 µm fundamental rovibrational band of H3+, a key tracer of the ionization of the molecular interstellar medium (ISM), in a sample of 12 local (d < 400 Mpc) (ultra)luminous infrared galaxies ((U)LIRGs) observed with JWST/NIRSpec. The P, Q, and R branches of the band are detected in 13 out of 20 a…
Confrontation between modelled solar integrated observables and direct observations. I. Radial velocities and convective blueshift
Meunier, N.; Lagrange, A. -M.; Dumusque, X. +1 more
Context. Stellar variability strongly impacts the search for low-mass exoplanets with radial velocity techniques. Two types of planet-free time series can be used to quantify this impact: models and direct solar observations after a subtraction of the Solar System planetary contribution. Making a comparison among these approaches is necessary to i…
A Detailed Study of Jupiter's Great Red Spot over a 90-day Oscillation Cycle
Wong, Michael H.; Irwin, Patrick G. J.; Simon, Amy A. +1 more
Jupiter's Great Red Spot (GRS) is known to exhibit oscillations in its westward drift with a 90-day period. The GRS was observed with the Hubble Space Telescope on eight dates over a single oscillation cycle in 2023 December to 2024 March to search for correlations in its physical characteristics over that time. Measured longitudinal positions are…
A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections
Lynch, B. J.; Antiochos, S. K.; Kumar, P. +3 more
Coronal mass ejections (CMEs) from pseudostreamers represent a significant fraction of large-scale eruptions from the Sun. In some cases, these CMEs take a narrow jet-like form reminiscent of coronal jets; in others, they have a much broader fan-shaped morphology like CMEs from helmet streamers. We present results from a magnetohydrodynamic simula…