Search Publications
Observations of Magnetic Reconnection and Particle Acceleration Locations in Solar Coronal Jets
Panesar, Navdeep K.; Fleishman, Gregory D.; Musset, Sophie +2 more
We present a multiwavelength analysis of two flare-related jets on 2014 November 13, using data from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), the Reuven High Energy Solar Spectroscopic Imager (RHESSI), the Hinode/X-ray Telescope (XRT), and the Interface Region Imaging Spectrograph (IRIS). Unlike most coronal jets, whe…
Spatial Extent of Molecular Gas, Dust, and Stars in Massive Galaxies at z ∼ 2.2-2.5 Determined with ALMA and JWST
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +3 more
We present the results of 0.″6-resolution observations of CO J = 3 - 2 line emission in 10 massive star-forming galaxies at z ~ 2.2-2.5 with the Atacama Large Millimeter/submillimeter Array (ALMA). We compare the spatial extent of molecular gas with those of dust and stars, traced by the 870 and 4.4 µm continuum emissions, respectively. The …
Non-field-aligned Proton Beams and Their Roles in the Growth of Fast Magnetosonic/Whistler Waves: Solar Orbiter Observations
Verscharen, Daniel; He, Jiansen; Fedorov, Andrey +5 more
The proton beam is an important population of the non-Maxwellian proton velocity distribution in the solar wind, but its role in wave activity remains unclear. In particular, the velocity vector of the proton beam and its influence on wave growth/damping have not been addressed before. Here we explore the origin and the associated particle dynamic…
Transition Probabilities of Near-infrared Ce III Lines from Stellar Spectra: Applications to Kilonovae
Lee, Ho-Gyu; Lee, Jae-Joon; Ishigaki, Miho N. +6 more
Kilonova spectra provide us with information of r-process nucleosynthesis in neutron star mergers. However, it is still challenging to identify individual elements in the spectra mainly due to the lack of experimentally accurate atomic data for heavy elements at near-infrared wavelengths. Recently, Domoto et al. proposed that the absorption featur…
First Metis Detection of the Helium D3 Line Polarization in a Large Eruptive Prominence
Telloni, Daniele; Susino, Roberto; Fineschi, Silvano +24 more
Metis on board Solar Orbiter is the space coronagraph developed by an Italian-German-Czech consortium. It is capable of observing solar corona and various coronal structures in the visible-light (VL) and UV (hydrogen Lyα) channels simultaneously for the first time. Here we present observations of a large eruptive prominence on 2021 April 25-26, in…
All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample
Rest, Armin; Matheson, Thomas; Points, Sean +14 more
Hot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T eff and surface gravity , which can be deduced from their optical spectra and used in model atmospheres to predict their spectral energy d…
Updated Reference Wavelengths for Si VII and Mg VII Lines in the 272-281 Å Range
Young, Peter R.
New reference wavelengths for atomic transitions of Mg VII and Si VII in the 272-281 Å wavelength range are derived using measurements from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft. Mg VII and Si VII are important ions for measuring plasma properties in the solar transition region at around 0.6 MK. The six …
Investigating Possible Binarity for GJ 229B
Mandell, Avi M.; McElwain, Michael W.; Howe, Alex R.
GJ 229B, the first type-T brown dwarf to be discovered, has presented a tension between comparisons with evolutionary models and the larger-than-expected mass and radius values derived from spectroscopic and astrometric observations. We examine the hypothesis that GJ 229B is actually a binary substellar object by using two grid-based fits using ev…
Connection between Polytropic Index and Heating
McComas, D. J.; Livadiotis, G.
The paper derives the one-to-one connecting relationships between plasma heating and its polytropic index, and addresses the consequences through the transport equation of temperature. Thermodynamic polytropic processes are classified in accordance to their polytropic index, the exponent of the power-law relationship of thermal pressure expressed …
Deep Search for Gamma-Ray Emission from the Accreting X-Ray Pulsar 1A 0535+262
Torres, D. F.; Li, J.; Ji, L. +2 more
Binary systems are a well-established subclass of gamma-ray sources. The high mass X-ray binary pulsar 1A 0535+262 has been considered to be a possible gamma-ray emitter for a long time, although former gamma-ray searches using the Fermi Large Area Telescope (LAT) and VERITAS data resulted in upper limits only. We aim at a deep search for gamma-ra…