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Characterization of dense Planck clumps observed with Herschel and SCUBA-2
Juvela, M.; Montillaud, J.; Traficante, A. +15 more
Context. Although the basic processes of star formation (SF) are known, more research is needed on SF across multiple scales and environments. The Planck all-sky survey provided a large catalog of Galactic cold clouds and clumps that have been the target of several follow-up surveys.
Aims: We aim to characterize a diverse selection of dense, …
Solar Orbiter's encounter with the tail of comet C/2019 Y4 (ATLAS): Magnetic field draping and cometary pick-up ion waves
Fedorov, A.; Livi, S.; Müller, D. +36 more
Context. Solar Orbiter is expected to have flown close to the tail of comet C/2019 Y4 (ATLAS) during the spacecraft's first perihelion in June 2020. Models predict a possible crossing of the comet tails by the spacecraft at a distance from the Sun of approximately 0.5 AU.
Aims: This study is aimed at identifying possible signatures of the int…
The Spatial and Temporal Distribution of Nighttime Ozone and Sulfur Dioxide in the Venus Mesosphere as Deduced From SPICAV UV Stellar Occultations
Montmessin, F.; Korablev, O.; Bertaux, J. -L. +5 more
The nighttime ozone and sulfur dioxide distributions were analyzed using the entire Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Venus (SPICAV) UV/Venus Express stellar occultation data set. After the discovery of an ozone layer at 100 km in the mesosphere reported by Montmessin, Bertaux, et al. (2011,
Modelling X-ray RMS spectra II: the ultrafast outflow of PDS 456
Reeves, J. N.; Alston, W. N.; Matzeu, G. A. +6 more
We present an improved model for excess variance spectra describing ultrafast outflows and successfully apply it to the luminous ($L_{\rm bol}\sim 10^{47}\mathrm{erg}\, \mathrm{s}^{-1}$) low-redshift (z = 0.184) quasar Pico del Dias Survey (PDS) 456. The model is able to account well for the broadening of the spike-like features of these outflows …
MEGANE investigations of Phobos and the Small Body Mapping Tool
Chabot, Nancy L.; Ernst, Carolyn M.; Nair, Hari +4 more
The MEGANE instrument onboard the MMX mission will acquire gamma-ray and neutron spectroscopy data of Phobos to determine the elemental composition of the martian moon and provide key constraints on its origin. To produce accurate compositional results, the irregular shape of Phobos and its proximity to Mars must be taken into account during the a…
Exotic image formation in strong gravitational lensing by clusters of galaxies - I. Cross-section
Meena, Ashish Kumar; Bagla, Jasjeet Singh
In a recent paper, we have discussed the higher order singularities in gravitational lensing. We have shown that a singularity map, comprising A3- lines and unstable (point) singularities (A4 and D4), is a compact representation of high magnification regions corresponding to a given lens model for all possible sour…
Orbits of 47 dwarf satellite galaxies of the Milky Way in three models of the gravitational potential with different masses
Bobylev, V. V.; Bajkova, A. T.
The analysis of the orbits of 47 dwarf satellite galaxies of the Milky Way, built using three models of the galactic gravitational potential with different masses, is presented. The models of the galactic potential were chosen based on the analysis of a large number of the Galaxy mass estimates known from the literature. The astrometric data neede…
Upper limits for phosphine (PH3) in the atmosphere of Mars
Patel, M. R.; Montmessin, F.; Irwin, P. G. J. +12 more
Phosphine (PH3) is proposed to be a possible biomarker in planetary atmospheres and has been claimed to have been observed in the atmosphere of Venus, sparking interest in the habitability of Venus's atmosphere. Observations of another biomarker, methane (CH4), have been reported several times in the atmosphere of Mars, hinti…
Near-IR Observations of the Young Star [BHB2007]-1: A Substellar Companion Opening the Gap in the Disk
Cleeves, L. Ilsedore; Garufi, Antonio; Zhu, Zhaohuan +5 more
The presence of planets or substellar objects still embedded in their native protoplanetary disks is indirectly suggested by disk substructures like gaps, cavities, and spirals. However, these companions are rarely detected. We present Very Large Telescope/NACO high-contrast images in the J, H, KS, and $L^{\prime} $ bands of the young s…
Multiwavelength analysis of the X-ray spur and southeast of the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Kavanagh, P. J. +5 more
Aims: The giant H II region 30 Doradus (30 Dor) located in the eastern part of the Large Magellanic Cloud is one of the most active star-forming regions in the Local Group. Studies of H I data have revealed two large gas structures which must have collided with each other in the region around 30 Dor. In X-rays there is extended emission (~1 k…