Search Publications
Desaturated EUV Flare Ribbons in an X-class Flare
Krucker, Säm; Schwartz, Richard A.; Torre, Gabriele
This paper studies the energy dissipation of nonthermal electrons in the chromospheric flare ribbons during the peak time of a Geostationary Operational Environmental Satellite X-class flare (SOL2011-09-06) using desaturated Solar Dynamics Observatory/Atmospheric Imaging Assembly extreme-ultraviolet (EUV) narrow-band images. The temperature distri…
ALMA Host Galaxy Observation of the Off-axis Gamma-Ray Burst XRF 020903
Urata, Yuji; Huang, Kuiyun; Chen, Jheng-Cyun
We investigated the radio properties of the host galaxy of X-ray flash, XRF 020903, which is the best example for investigating the off-axis origin of gamma-ray bursts (GRBs). Dust continuum at 233 GHz and CO are observed using the Atacama Large millimeter/submillimeter array. The molecular gas mass derived by applying the metallicity-dependent CO…
Investigating Toroidal Flows in the Sun Using Normal-mode Coupling
Mani, Prasad; Hanasoge, Shravan
Helioseismic observations have provided valuable data sets with which to pursue the detailed investigation of solar interior dynamics. Among various methods to analyze these data, normal-mode coupling has proven to be a powerful tool, used to study Rossby waves, differential rotation, meridional circulation, and nonaxisymmetric multiscale subsurfa…
Effect of Dust Size on the Near-infrared Spectra (1.0-5.0 µm) of Brown Dwarf Atmospheres
Sorahana, Satoko; Kobayashi, Hiroshi; Tanaka, Kyoko K.
In this study, we demonstrate the dependence of atmospheric dust size on the near-infrared spectra of ten L dwarfs, and constrain the sizes of dust grains in each L dwarf atmosphere. In previous studies, by comparing observed and modeled spectra, it was suggested that the deviations of their spectral shapes from theoretical prediction are general …
Mapping Solar X-Ray Images from SDO/AIA EUV Images by Deep Learning
Yang, Bo; Yang, Jiayan; Bi, Yi +6 more
The full-Sun corona is now imaged every 12 s in extreme ultraviolet (EUV) passbands by Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), whereas it is only observed several times a day at X-ray wavelengths by Hinode/X-Ray Telescope (XRT). In this paper, we apply a deep-learning method, i.e., the convolution neural network (CNN), to es…
Identifying Circumgalactic Medium Absorption in QSO Spectra: A Bayesian Approach
Scott, Jennifer E.; Shoemaker, Emileigh S.; Hamill, Colin D.
We present a study of candidate galaxy-absorber pairs for 43 low-redshift QSO sightlines (0.06 < z < 0.85) observed with the Hubble Space Telescope/Cosmic Origins Spectrograph that lie within the footprint of the Sloan Digital Sky Survey with a statistical approach to match absorbers with galaxies near the QSO lines of sight using only the S…
Characterizing Magnetic Connectivity of Solar Flare Electron Sources to STEREO Spacecraft Using ADAPT-WSA Modeling
Arge, C. N.; Henney, C. J.; Kahler, S. W. +1 more
Onsets and intensity profiles of six energetic (E > 30 keV) electron events common to STEREO A and B (STA and STB) spacecraft were analyzed by Klassen et al. with the STEREO Solar Electron and Proton Telescopes when the spacecraft were separated by <70° in solar longitude. All six events were characterized by earlier onsets and higher peak i…
Long-term Evolution of the Short-term X-Ray Variability of the Jetted TDE Swift J1644+57
Jin, Chichuan
The short-term X-ray variability of tidal disruption events (TDEs) and its similarities with that of active galactic nuclei are poorly understood. In this work, we show the diversity of TDEs' short-term X-ray variability, and take Swift J1644+57 as an example to study the evolution of various properties related to the short-term X-ray variability,…
Deciphering the 3D Orion Nebula-IV: The HH 269 Flow Emerges from the Orion-S Embedded Molecular Cloud
Abel, N. P.; O'Dell, C. R.; Ferland, G. J.
We have extended the membership and determined the 3D structure of the large (0.19 pc) HH 269 sequence of shocks in the Orion Nebula. All of the components lie along a track that is highly tilted to the plane of the sky and emerge from within the Orion-S embedded molecular cloud. Their source is probably either the highly obscured mm 9 source asso…
Modeling the Hα Emission Surrounding Spica Using the Lyman Continuum from a Gravity-darkened Central Star
Aufdenberg, Jason P.; Hammill, Joseph M.
The large, faint Hα emission surrounding the early B-star binary Spica has been used to constrain the total hydrogen recombination rate of the nebula and indirectly probe the Lyman continuum luminosity of the primary star. Early analysis suggested that a stellar atmosphere model, consistent with Spica A's spectral type, has a Lyman continuum lumin…