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Physical conditions and redshift evolution of optically thin C III>absorbers: low-z sample
Pradhan, Ananta C.; Mohapatra, Abhisek; Srianand, R.
We present a detailed analysis of 99 optically thin C III absorption systems at redshift 0.2 ≤ z ≤ 0.9 associated with neutral hydrogen column densities in the range 15 ≤ log $N({\rm{H\,{\small I}}})$ (cm-2) ≤ 16.2. Using photoionization models, we infer the number density (nH), C-abundance ([C/H]), and line-of-sight thicknes…
Astrometry and photometry of digitized plates of Baldone Schmidt telescope
Eglitis, Ilgmars; Andruk, Vitaly
During the 40-year photographic period of astronomical observations, the Baldone Astrophysical Observatory has accumulated more than 22,000 direct and 2,500 spectral images. In 2018, the digitization of direct astrophoto images with a resolution of 1200 dpi was completed. A processing methodology for obtaining the equatorial coordinates and photom…
Synthetic topography from the decameter to the centimeter scale on Mars for scientific and rover operations of the ESA-Roscosmos ExoMars mission
Wöhler, C.; Ruesch, O.; Josset, J. -L. +7 more
The ESA-Roscosmos ExoMars platform and rover mission will have complex interactions with the martian surface. In order to plan and perform landing, roving and scientific operations, the morphological characteristics of the terrain surrounding the rover need to be characterized from the decameter to the centimeter spatial scale. The smallest possib…
The Host Galaxy of the Dwarf Seyfert UGC 06728
Bentz, Misty C.
We present multi-color high-resolution imaging of the host galaxy of the dwarf Seyfert UGC 06728. As the lowest-mass black hole to be described with both a direct mass constraint and a spin constraint, UGC 06728 is an important source for comparison with black hole evolutionary models, yet little is known about the host galaxy. Using Hubble Space …
Large Scale Modulation: View from the Earth Points
Belov, A. V.; Yanke, V. G.; Oleneva, V. A. +1 more
The article reports a review of the current results obtained over the past decade in the study of cosmic ray solar modulation. The analysis of modulation effects was carried out in the isotropic and anisotropic approximations on the data of the ground-based network of detectors and the first data from the PAMELA and AMS-02 magnetic spectrometers. …
Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com
Pál, A.; Sódor, Á.; Benkő, J. M.
By analyzing photometric and spectroscopic time series, we show that the pulsator V764 Mon, assumed to be the brightest RR Lyr star in the sky, is in fact a rapidly rotating δ Sct star with an unusually long dominant period (P1=0.29 d). Our spectroscopy confirmed the binarity of V764 Mon discovered by the Gaia satellite. In the case of …
PROBA2 LYRA Occultations: Thermospheric Temperature and Composition, Sensitivity to EUV Forcing, and Comparisons With Mars
Dominique, Marie; Thiemann, Edward M. B.
A method for retrieving temperature and composition from 150 to 350 km in Earth's thermosphere using total number density measurements made via extreme ultraviolet (EUV) solar occultations by the Project for OnBoard Autonomy 2/Large Yield Radiometer (PROBA2/LYRA) instrument is presented. Systematic and random uncertainties are calculated and found…
On the scaling relations of bulges and early-type galaxies
Pastrav, Bogdan A.
Following from our recent work, we present here a detailed structural analysis of a representative sample of nearby spiral and early-type galaxies (ETGs) taken from the Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel/ (KINGFISH) / Spitzer Infrared Nearby Galaxies Survey (SINGS) surveys. The photometric parameters of bulges are…
Astrometric Observations of a Near-Earth Object Using the Image Fusion Technique
Su, Jie; Wang, Jiancheng; Zhang, Yigong +2 more
The precise astrometric observation of small near-Earth objects (NEOs) is an important observational research topic in the astrometric discipline, which greatly promotes multidisciplinary research, such as the origin and evolution of the solar system, the detection and early warning of small NEOs, and deep-space navigation. The characteristics of …
A Revisit to the Optical Starlight Polarization Catalogue by Heiles: Distance Update
Meng, Mei-niang; Sun, Xiao-hui
Starlight polarization serves one of the powerful tools to study magnetic fields in the Galactic interstellar medium. Heiles catalogue contains polarization information for 9286 stars, and is by far the biggest. This catalogue has been extensively used to study the magnetic fields. However, the distance parameters of the stars in this catalogue ar…