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A new radio catalogue for M83: supernova remnants and H II regions
Soria, Roberto; White, Richard L.; Blair, William P. +3 more
We present a new catalogue of radio sources in the face-on spiral galaxy M83. Radio observations taken in 2011, 2015, and 2017 with the Australia Telescope Compact Array at 5.5 and 9 GHz have detected 270 radio sources. Although a small number of these sources are background extragalactic sources, most are either H II regions or supernova remnants…
A giant galaxy in the young Universe with a massive ring
Kacprzak, Glenn G.; Glazebrook, Karl; Labbé, Ivo +12 more
In the local (redshift z ≈ 0) Universe, collisional ring galaxies make up only ~0.01% of galaxies1 and are formed by head-on galactic collisions that trigger radially propagating density waves2-4. These striking systems provide key snapshots for dissecting galactic disks and are studied extensively in the local Universe5…
A novel approach for optimal trajectory design with multiple operation modes of propulsion system, part 2
Taheri, Ehsan; Junkins, John L.; Kolmanovsky, Ilya +1 more
Equipping a spacecraft with multiple solar-powered electric engines (of the same or different types) compounds the task of optimal trajectory design due to presence of both real-valued inputs (power input to each engine in addition to the direction of thrust vector) and discrete variables (number of active engines). Each engine can be switched on/…
On the Production of He+ of Solar Origin in the Solar Wind
Landi, Enrico; Rivera, Yeimy J.; Lepri, Susan T. +1 more
Solar wind measurements in the heliosphere predominantly comprise protons, alphas, and minor elements in a highly ionized state. The majority of low-charge states, such as He+, measured in situ are often attributed to pick-up ions of nonsolar origin. However, through inspection of the velocity distribution functions of near-Earth measur…
Quantifying the structure of strong gravitational lens potentials with uncertainty-aware deep neural networks
Vernardos, Georgios; Tsagkatakis, Grigorios; Pantazis, Yannis
Gravitational lensing is a powerful tool for constraining substructure in the mass distribution of galaxies, be it from the presence of dark matter sub-haloes or due to physical mechanisms affecting the baryons throughout galaxy evolution. Such substructure is hard to model and is either ignored by traditional, smooth modelling, approaches, or tre…
Titan's neutral atmosphere seasonal variations up to the end of the Cassini mission
Flasar, F. M.; Lavvas, P.; Coustenis, A. +4 more
In this paper we report new results concerning the seasonal atmospheric evolution near Titan's poles and equator in terms of temperature and composition using nadir spectra acquired by the Cassini Composite Infrared Spectrometer (CIRS) at high spectral resolution during the last year of the Cassini mission in 2017 complementing previous investigat…
Detection of Pb II in the Ultraviolet Spectra of Three Metal-poor Stars
Beers, Timothy C.; Placco, Vinicius M.; Holmbeck, Erika M. +8 more
We report the first detection of the Pb II line at 2203.534 Šin three metal-poor stars, using ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. We perform a standard abundance analysis assuming local thermodynamic equilibrium (LTE) to derive lead (Pb, Z = 82) abundances. The Pb II line …
The large-scale magnetic field of the eccentric pre-main-sequence binary system V1878 Ori
Hussain, G. A. J.; Alecian, E.; Kochukhov, O. +4 more
We report time-resolved, high-resolution optical spectropolarimetric observations of the young double-lined spectroscopic binary V1878 Ori. Our observations were collected with the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii Telescope through the BinaMIcS large programme. V1878 Ori A and B are partially convective intermediate mass wea…
Tracking the year-to-year variation in the spectral energy distribution of the narrow-line Seyfert 1 galaxy Mrk 335
Komossa, S.; Gallo, L. C.; Grupe, D. +5 more
Multiwavelength monitoring of Mrk 335 with Swift between 2007 and 2019 are used to construct annual spectral energy distributions (SEDs) and track year-to-year changes. Non-contemporaneous archival data prior to 2007 are used to build a bright state SED. In this work, the changes are examined and quantified to build the foundation for future SED m…
Detection of green line emission in the dayside atmosphere of Mars from NOMAD-TGO observations
Aoki, S.; Vandaele, A. C.; Daerden, F. +13 more
The oxygen emission at 557.7 nm is a ubiquitous component of the spectrum of the terrestrial polar aurora and the reason for its usual green colour1. It is also observed as a thin layer of glow surrounding the Earth near 90 km altitude in the dayside atmosphere2,3 but it has so far eluded detection in other planets. Here we r…