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Reconstructing the mid-infrared spectra of galaxies using ultraviolet to submillimeter photometry and Deep Generative Networks
Efstathiou, A.; Rissaki, Agapi; Pavlou, O. +2 more
The mid-infrared spectra of galaxies are rich in features such as the Polycyclic Aromatic Hydrocarbon (PAH) and silicate dust features which give valuable information about the physics of galaxies and their evolution. For example they can provide information about the relative contribution of star formation and accretion from a supermassive black …
A summary of instruments proposed for observing pulsating variables from the Mt. Abu Observatory
Ganesh, Shashikiran; Prajapati, Prachi; Mishra, Anwesh Kumar +3 more
Pulsating variables play a significant role in shaping modern astronomy. Presently it is an exciting era in observational study of variable stars owing to surveys like OGLE and TESS. The vast number of sources being discovered by these surveys is also creating opportunities for 1–2-m class telescopes to provide follow-up observations to characteri…
Variable circularly polarized radio emission from the young stellar object [BHB2007]-1: Another ingredient of a unique system
Viganò, Daniele; Cleeves, L. Ilsedore; Zurlo, Alice +7 more
The young stellar object [BHB2007]-1 has been extensively studied in the past at radio, millimeter, and infrared wavelengths. It has revealed a gap in the disk and previous observations have claimed possible emission from a sub-stellar object undergoing formation, in correspondence to the disk gap. In this work, we analyzed a set of eight Karl G. …
Effect of Target Layering in Gravity-Dominated Cratering in Nature, Experiments, and Numerical Simulations
Rossi, A. P.; Raducan, S. D.; Collins, G. S. +4 more
Impacts into layered targets may generate "concentric craters" where a wider outer crater in the top layer surrounds a smaller, nested crater in the basement, which itself may be complex or simple. The influence of target on cratering depends on the ratio of target strength to lithostatic stress, which, in turn, is affected by gravity, target dens…
Three-dimensional Venusian ionosphere model
Chaufray, Jean-Yves; Lefèvre, Franck; Lebonnois, Sébastien +3 more
To study the Venusian ionosphere, a 3D ionospheric model is included in the Venus Planetary Climate Model (Venus PCM), which we present here with a number of recent extensions and improvements. Our ionospheric model of Venus consists of 15 charged species (electron and 14 ions), 13 photo-ionization for 8 species, an ion-neutral chemistry (61 react…
Revealing the Impact of Critical Stellar Central Density on Galaxy Quenching through Cosmic Time
Xu, Bingxiao; Peng, Yingjie
In a previous work, we investigated the structural and environmental dependence on quenching in the nearby universe. In this work, we extend our investigations to higher redshifts by combining galaxies from the Sloan Digital Sky Survey and The FourStar Galaxy Evolution surveys. In low density, we find a characteristic Σ1 kpc above which…
Stratospheric aerosols and C6H6 in Jupiter's south polar region from JWST/MIRI observations
de Pater, Imke; Fletcher, Leigh N.; Vinatier, Sandrine +14 more
Context. The polar atmosphere of Jupiter is significantly affected by auroral activity, which can induce both thermal and chemical differences compared to the rest of the atmosphere. In particular, auroral activity enhances the production of various hydrocarbons, including benzene. Benzene could be a potential precursor to the formation of the str…
Modeling the Enceladus dust plume based on in situ measurements performed with the Cassini Cosmic Dust Analyzer
Kempf, S.; Postberg, F.; Srama, R. +5 more
We analyzed data recorded by the Cosmic Dust Analyzer on board the Cassini spacecraft during Enceladus dust plume traversals. Our focus was on profiles of relative abundances of grains of different compositional types derived from mass spectra recorded with the Dust Analyzer subsystem during the Cassini flybys E5 and E17. The E5 profile, correspon…
Star Formation Characteristics of Galaxies Hosting AGN
Nandi, Payel; Subramonian Stalin, Chelliah
We present an analysis of the ultra-violet (UV) observations of two Seyfert type active galactic nuclei (AGN), namely NGC 4051 and NGC 4151. These observations aimed at studying the star formation in the hosts of these AGN were carried out with the ultra-violet imaging telescope on board AstroSat in far-UV. A total of 193 and 328 star-forming regi…
First Solar Orbiter observation of a dark halo in the solar atmosphere
Parenti, S.; Long, D. M.; Andretta, V. +5 more
Context. Solar active regions (ARs) are often surrounded by dark large areas of reduced emission compared to the quiet Sun, observed at various wavelengths corresponding to the chromosphere, transition region (TR), and corona, known as dark halos (DHs). The mechanisms behind the darker emission of DHs remain unclear and merit a wider scope of stud…