Search Publications
PSP/IS⊙IS Observation of a Solar Energetic Particle Event Associated with a Streamer Blowout Coronal Mass Ejection during Encounter 6
Palmerio, E.; Mitchell, D. G.; McComas, D. J. +21 more
In this paper we examine a low-energy solar energetic particle (SEP) event observed by IS⊙IS's Energetic Particle Instrument-Low (EPI-Lo) inside 0.18 au on 2020 September 30. This small SEP event has a very interesting time profile and ion composition. Our results show that the maximum energy and peak in intensity are observed mainly along the ope…
A Time-dependent Self-similar Reconstruction of Solar Coronal Mass Ejections Based on the Gibson-Low Model
Dai, Xinghua
The analytic Gibson-Low (GL) model, a time-dependent self-similar solution of the magnetohydrodynamics, is first used to directly reconstruct a coronal mass ejection (CME) through the method of forward modeling in this study. A systematic description of the GL model is presented at the beginning, and a set of parameters is introduced to define the…
Discovery and origin of the radio emission from the multiple stellar system KQ Vel
Umana, G.; Owocki, S. P.; Fossati, L. +20 more
KQ Vel is a binary system composed of a slowly rotating magnetic Ap star with a companion of unknown nature. In this paper, we report the detection of its radio emission. We conducted a multifrequency radio campaign using the ATCA interferometer (band-names: 16 cm, 4 cm, and 15 mm). The target was detected in all bands. The most obvious explanatio…
Relative Astrometry in an Annular Field
Lattanzi, M. G.; Busonero, D.; Butkevich, A. G. +4 more
Background. Relative astrometry at or below the microarcsec level with a 1 m class space telescope has been repeatedly proposed as a tool for exo-planet detection and characterization, as well as for several topics at the forefront of Astrophysics and Fundamental Physics. Aim. This paper investigates the potential benefits of an instrument concept…
Magnetic fields and hot gas in M 101
Ehle, M.; Weżgowiec, M.; Soida, M. +4 more
Context. Studies of nearby spiral galaxies in radio and X-ray wavelengths reveal the structure and energy balance of the magnetic fields and the hot interstellar medium (ISM). In some spiral galaxies, large-scale ordered magnetic fields have been found between the spiral stellar arms (the so-called magnetic arms). One of the considered explanation…
Density exponent analysis: gravity-driven steepening of the density profiles of star-forming regions
Li, Guang-Xing; Zhou, Ji-Xuan
The evolution of molecular interstellar clouds is a complex, multiscale process. The power-law density exponent describes the steepness of density profiles, and it has been used to characterize the density structures of the clouds; yet its usage is usually limited to spherically symmetric systems. Importing the Level-Set Method, we develop a new f…
Stellar populations of the globular cluster NGC 5053 investigated using AstroSat-Ultra Violet Imaging Telescope
Nikitha, K. J.; Vig, S.; Ghosh, S. K.
Globular clusters (GCs), being old and densely packed, serve as ideal laboratories to test stellar evolution theories. Although there is enormous literature on GCs in optical bands, studies in the ultraviolet (UV) regime are sparse. In this work, we study the stellar populations of a metal-poor and a rather dispersed GC, NGC 5053, using the UV ins…
An ALMA Observation of Time Variations in Chromospheric Temperature of a Solar Plage Region
Shimojo, Masumi; Shimizu, Toshifumi; Abe, Masashi
Nanoflares and the shock formation of magnetohydrodynamic waves in the solar chromosphere have been considered as key physical mechanisms of the heating of the chromosphere and corona. To investigate candidates of their signature in the mm-wavelength, a tiny active region located on the solar disk was observed with the Atacama Large millimeter and…
A Three-Dimensional Analytical Model of the Interstellar Extinction within the Nearest Kiloparsec
Savchenko, S. S.; Gontcharov, G. A.; Il'in, V. B. +6 more
We present a new version of our analytical model of the spatial interstellar extinction variations within the nearest kiloparsec from the Sun. This model treats the three-dimensional (3D) dust distribution as a superposition of three overlapping layers: (1) the layer along the Galactic midplane, (2) the layer in the Gould Belt, and (3) the layer p…
The Physical Properties of Star-forming Galaxies with Strong [O III] Lines at z = 3.25
Fang, Min; Zheng, Xian Zhong; Xu, Haiguang +13 more
We present an analysis of physical properties of 34 [O III] emission-line galaxies (ELGs) at z = 3.254 ± 0.029 in the Extended Chandra Deep Field South (ECDFS). These ELGs are selected from deep narrow H2S(1) and broad K s imaging of 383 arcmin2 obtained with CFHT/WIRCam. We construct spectral energy distributions …