Search Publications
Reddening and He I ∗ λ10830 Absorption Lines in Three Narrow-line Seyfert 1 Galaxies
Zhou, Hongyan; Ji, Tuo; Shi, Xiheng +6 more
We report the detection of heavy reddening and the He I* λ10830 absorption lines at the active galactic nucleus (AGN) redshift in three narrow-line Seyfert 1 galaxies: SDSS J091848.61+211717.0, SDSS J111354.66+124439.0, and SDSS J122749.13+321458.9. They exhibit very red optical to near-infrared colors, narrow Balmer/Paschen broad emission lines a…
Two-dimensional Molecular Gas and Ongoing Star Formation around H II Region Sh2-104
Wang, Jun-Jie; Xu, Jin-Long; Xu, Ye +6 more
We performed a multi-wavelength study toward H II region Sh2-104. New maps of 12CO J = 1 - 0 and 13CO J = 1 - 0 were obtained from the Purple Mountain Observatory 13.7 m radio telescope. Sh2-104 displays a double-ring structure. The outer ring with a radius of 4.4 pc is dominated by 12, 500 µm, 12CO J = 1 - 0…
Unusual Black Hole Binary LMC X-3: A Transient High-mass X-Ray Binary That Is Almost Always On?
Boyd, Patricia T.; Smale, Alan P.; Valencic, Lynne A. +1 more
We have analyzed a rich, multimission, multiwavelength data set from the black hole X-ray binary (BHXB) LMC X-3, covering a new anomalous low state (ALS), during which the source flux falls to an unprecedentedly low and barely detectable level, and a more normal low state. Simultaneous X-ray and UV/optical monitoring data from Swift are combined w…
The FluxCompensator: Making Radiative Transfer Models of Hydrodynamical Simulations Directly Comparable to Real Observations
Robitaille, Thomas P.; Koepferl, Christine M.
When modeling astronomical objects throughout the universe, it is important to correctly treat the limitations of the data, for instance finite resolution and sensitivity. In order to simulate these effects, and to make radiative transfer models directly comparable to real observations, we have developed an open-source Python package called the Fl…
High Radiation Pressure on Interstellar Dust Computed by Light-scattering Simulation on Fluffy Agglomerates of Magnesium-silicate Grains with Metallic-iron Inclusions
Kimura, Hiroshi
Recent space missions have provided information on the physical and chemical properties of interstellar grains such as the ratio β of radiation pressure to gravity acting on the grains in addition to the composition, structure, and size distribution of the grains. Numerical simulation on the trajectories of interstellar grains captured by Stardust…
Pseudo-automatic Determination of Coronal Mass Ejections’ Kinematics in 3D
Stenborg, Guillermo; Dal Lago, Alisson; Echer, Ezequiel +2 more
Coronal mass ejection (CME) events are among the main drivers of geomagnetic disturbances, and hence play a central role in the Sun-Earth system. Their monitoring and, in particular, the determination of their speed and direction of propagation are key issues for the forecasting of space weather near to Earth. We have implemented a method to track…
Measuring Velocities in the Early Stage of an Eruption: Using “Overlappogram” Data from Hinode EIS
Warren, Harry; Harra, Louise K.; Doschek, George A. +4 more
In order to understand the onset phase of a solar eruption, plasma parameter measurements in the early phases are key to constraining models. There are two current instrument types that allow us to make such measurements: narrow-band imagers and spectrometers. In the former case, even narrow-band filters contain multiple emission lines, creating s…
Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS
Tiengo, Andrea; Haberl, Frank; Belfiore, Andrea +9 more
We performed a search for eclipsing and dipping sources in the archive of the EXTraS project—a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A system…
Flare Ribbons Approach Observed by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory
Hou, Yijun; Li, Ting; Zhang, Jun
We report flare ribbons approach (FRA) during a multiple-ribbon M-class flare on 2015 November 4 in NOAA AR 12443, obtained by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory. The flare consisted of a pair of main ribbons and two pairs of secondary ribbons. The two pairs of secondary ribbons were formed later than the …
Removing Visual Bias in Filament Identification: A New Goodness-of-fit Measure
Green, C. -E.; Dawson, J. R.; Cunningham, M. R. +3 more
Different combinations of input parameters to filament identification algorithms, such as disperse and filfinder, produce numerous different output skeletons. The skeletons are a one-pixel-wide representation of the filamentary structure in the original input image. However, these output skeletons may not necessarily be a good representation of th…