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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 …
Bright spectroscopic binaries: II. A study of five systems with orbital periods of P≲500 days
Jack, Dennis; Schröder, Klaus-Peter; Hernández Huerta, Missael Alejandro +1 more
We present a detailed analysis of five bright spectroscopic binary systems (HD 18665, HD 27131, HD 171852, HD 215550, and HD 217427) that have orbital periods of P≲500 days. We determined the complete set of orbital parameters using the toolkit RadVel by analyzing the observed radial velocity curves. To study the properties of the five systems, we…
The Curious Case of the "Heartworm" Nebula
Heywood, I.; Camilo, F.; Predehl, P. +9 more
The curious Galactic features near G357.2-0.2 were observed with the MeerKAT radio interferometer array in the UHF and L bands (0.56-1.68 GHz). There are two possibly related features: a newly identified faint heart-shaped partial shell (the "heart"), and a series of previously known but now much better imaged narrow, curved features (the "worm") …
Link between the Optical and Radio Frames from Gaia DR3 Data and VLBI Measurements
Bobylev, V. V.
Based on published data, we have assembled a sample of 126 radio stars with the trigonometric parallaxes and proper motions measured by VLBI and available in the Gaia DR3 catalogue (in fact, Gaia EDR3). Our analysis of the Gaia-VLBI proper motion differences for 84 radio stars based on the model of solid-body mutual rotation has revealed no rotati…
Dust Mass Associated with the Supernova Remnant IC 443 When Emission Meets Extinction
Jiang, Biwei; Zhao, He; Li, Jun
The dust mass of the well-known supernova remnant IC 443 is estimated from both the infrared emission and the visual extinction. With photometry to the images taken by Spitzer, WISE, IRAS, AKARI, and Planck, the spectral energy distribution (SED) of the dust is obtained after subtracting synchrotron radiation and considering the spectral line emis…
Dynamical Origin for the Collinder 132-Gulliver 21 Stream: A Mixture of Three Comoving Populations with an Age Difference of 250 Myr
Tang, Shih-Yun; Pang, Xiaoying; Wang, Long +6 more
We use Gaia DR3 data to study the Collinder 132-Gulliver 21 region via the machine-learning algorithm STARGO and find eight subgroups of stars (ASCC 32, Collinder 132 gp 1-6, Gulliver 21) located in close proximity. Three comoving populations were identified among these eight subgroups: (i) a coeval 25 Myr old moving group (Collinder 132), (ii) an…
Water-maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream
Zhang, Bo; Li, Jingjing; Wu, Yuanwei +1 more
A 22 GHz water-maser survey was conducted towards 178 O-rich asymptotic giant branch (AGB) stars with the aim of identifying maser emission associated with the Sagittarius stellar stream. In this survey, maser emissions were detected in 21 targets, 20 of which were new detections. We studied the Galactic distributions of H2O- and SiO-ma…
Type IV Radio Bursts and Associated Active Regions in Sunspot Cycle 24
Kumari, Anshu
We study the association of solar Type IV radio bursts with the location of active regions on the Sun during Solar Cycle 24. The active regions associated with moving and stationary Type IV bursts are categorized as close to disk center and far from disk center, based on their location on the solar surface (i.e. ≤45∘ or ≥45∘,…