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Fon Dushanbe Catalogue. Results of Processing in the Tycho-2 System
Andruk, V. M.; Protsyuk, Yu. I.; Yuldoshev, Q. +2 more
In the Tycho-2 catalogue system the processing of 1529 photographic plates of the FON Dushanbe project from the collection of the Institute of Astrophysics of the National Academy of Sciences of Tajikistan was completed. The photographic plates with the size of 8°×8° (30x30 cm) were exposed in the zones from -8° to + 84° in the period of 1985-1992…
FUGIN hot core survey. I. Survey method and initial results for l = 10°-20°
Hasegawa, Tetsuo; Saito, Hiro; Seta, Masumichi +4 more
We have developed a method to make a spectral-line-based survey of hot cores, which represent an important stage of high-mass star formation, and applied the method to the data of the FUGIN (FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope) survey. First, we select hot core candidates by searching the FUGIN data for t…
Future Venus missions and flybys: A collection of possible measurements with mass spectrometers and plasma instruments
Wurz, P.; Galli, A.; Vorburger, A. +1 more
This study contains predictions for mass spectrometry and plasma instrument measurements during upcoming Venus flybys of BepiColombo and Solar Orbiter and discusses the possibility of a phosphine detection with mass spectrometry in Venus' upper atmosphere. The results extend the ones published previously in Gruchola et al. (2019), where prediction…
Critical comments on publications by S. Hoffmann and N. Vogt on historical novae/supernovae and their candidates
Neuhäuser, Ralph; Neuhäuser, Dagmar L.
We critically discuss recent articles by S. Hoffmann and N. Vogt on historical novae and supernovae (SNe) as well as their list of "24 most promising events" "with rather high probability to be a nova" (Hoffmann et al., AN, 2020, 341, 79 (P3)). Their alleged positional accuracy of previously suggested historical nova/SN records is based on inhomog…
Shocks and Molecules in Diffuse Interstellar Cloud Pairs
Heiles, Carl; Reach, William T.
The diffuse interstellar medium (ISM) is dynamic, and its chemistry and evolution are determined by shock fronts as well as photodissociation. Shocks are implied by the supersonic motions and velocity dispersion, often statistically called "turbulence". We compare models of magnetohydrodynamic (MHD) shocks, with speeds typical of cloud motions thr…
Intermittent warmth on young Mars
Mangold, Nicolas
Warm and wet conditions could have episodically punctuated a generally cold early climate on Mars, according to a multidisciplinary modelling approach that potentially solves a five-decade long debate regarding warm conditions on early Mars.
The thermal emission of Saturn's icy moons. Effects of topography and regolith properties
Lucas, A.; Ferrari, C.; Jacquemoud, S.
Context. The effects of space weathering and other alteration processes on the upper surface of Saturn's icy moons are yet to be explored.
Aims: We present a thermophysical model parametrised by way of regolith properties such as porosity, grain size, and composition, as well as the local topography. The modelled surface temperature and appar…
An association of CMEs with solar flares detected by Fermi γ-ray burst monitor during solar cycle 24
Abdel-Sattar, Walid; Mawad, Ramy; Farid, Hussein M.
By performing certain spatial and temporal criteria, we obtained 492 CME events simultaneously associated with GBM solar flare events (hereafter, GBM-flare-CME) from the total number 5123 Gamma-ray Burst Monitor (GBM) solar flares and 15228 Coronal Mass Ejections (CMEs) detected during the solar cycle 24 (2008-2019). Among these 492 events, which …
Globular Cluster Candidates in the Sagittarius Dwarf Galaxy
Piatti, Andrés E.
Recently, new Sagittarius (Sgr) dwarf-galaxy globular clusters were discovered, which opens the question of the actual size of the Sgr globular cluster population, and therefore on our understanding of the Sgr galaxy formation and accretion history of the Milky Way. Based on Gaia EDR3 and SDSS IV DR16 (APOGEE-2) data sets, we performed an analysis…
Spatial statistics in star-forming regions: is star formation driven by column density alone?
Naylor, T.; Hatchell, J.; Retter, B.
Star formation is known to occur more readily where more raw materials are available. This is often expressed by a 'Kennicutt-Schmidt' relation where the surface density of young stellar objects (YSOs) is proportional to column density to some power, µ. The aim of this work was to determine if column density alone is sufficient to explain th…