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Measuring the gas reservoirs in 108 < M⋆ < 1011 M⊙ galaxies at 1 ≤ z ≤ 3
Pérez-González, Pablo G.; Magdis, Georgios E.; Sánchez-Blázquez, Patricia +7 more
Context. Understanding the gas content in galaxies, along with its consumption and replenishment, is vital to our grasp of the evolution of the Universe. Numerous studies have addressed this notion, utilizing various observational tools and analytical methods. These include examining low-transition 12CO millimeter rotational lines and e…
Cold electrons at a weakly outgassing comet
Henri, P.; Galand, M.; Deca, J. +1 more
Throughout the Rosetta mission, cold electrons (<1 eV) were measured in the coma of comet 67P/Churyumov-Gerasimenko. Cometary electrons are produced at ~10 eV through photoionization or through electron-impact ionization collisions. The cold electron population is formed by cooling the warm population through inelastic electron-neutral collisio…
Spectral similarities in galaxies through an unsupervised classification of spaxels
Fraix-Burnet, D.; Chambon, H. J.
Aims: We present the first unsupervised classification of spaxels in hyperspectral images of individual galaxies. Classes identify regions by spectral similarity and thus take all the information into account that is contained in the data cubes (spatial and spectral).
Methods: We used Gaussian mixture models in a latent discriminant subs…
Frequency Chirping of Electromagnetic Ion Cyclotron Waves in Earth's Magnetosphere
An, Zeyu; Tao, Xin; Zonca, Fulvio +1 more
Electromagnetic ion cyclotron (EMIC) waves are known to exhibit frequency chirping occasionally, contributing to the rapid acceleration and precipitation of energetic particles in the magnetosphere. However, the chirping mechanism of EMIC waves remains elusive. In this work, a phenomenological model of whistler mode chorus waves named the Trap-Rel…
Machine-learning applications for cataclysmic variable discovery in the ZTF alert stream
Copperwheat, C. M.; Darnley, M. J.; Mistry, D. +1 more
Cataclysmic variables (CV) encompass a diverse array of accreting white dwarf binary systems. Each class of CV represents a snapshot along an evolutionary journey, one with the potential to trigger a type Ia supernova event. The study of CVs offers valuable insights into binary evolution and accretion physics, with the rarest examples potentially …
IAS/CEA Evolution of Dust in Nearby Galaxies (ICED): The spatially-resolved dust properties of NGC4254
Berta, S.; Aussel, H.; Adam, R. +57 more
We present the first preliminary results of the project ICED, focusing on the face-on galaxy NGC4254. We use the millimetre maps observed with NIKA2 at lRAM-30m. as part of the IMEGIN Guaranteed Time Large Program. and of a wide collection of ancillary data (multi-wavelength photometry and gas phase spectral lines) that are publicly available. We …
Revisiting the Activity–Rotation Relation for Evolved Stars
Liu, Jifeng; Wang, Song; Li, Xue +2 more
The magnetic dynamo mechanism of giant stars remains an open question, which can be explored by investigating their activity–rotation relations with multiple proxies. By using the data from the LAMOST and Galaxy Evolution Explorer surveys, we carried out a comprehensive study of activity–rotation relations of evolved stars based on Ca II H and K l…
Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24
Aguilar-Rodriguez, E.; Corona-Romero, P.; Gonzalez-Esparza, J. A. +1 more
Stream interaction regions (SIRs) dominate the large-scale solar wind dynamics during the minimum of the solar cycle. The interaction of SIRs with the magnetosphere causes most of geomagnetic storms during this epoch. We used in-situ solar wind observations at 1 AU to study 62 SIRs detected in the interval 2007-2008 (minimum of cycle 23) and 61 SI…
Unexpected increase of the deuterium to hydrogen ratio in the Venus mesosphere
Vandaele, Ann Carine; Robert, Séverine; Chamberlain, Sarah +14 more
Studying Venus's HDO and H2O sheds light on its water history. The HDO/H2O ratio in its bulk atmosphere, 120 times Earth's, suggests a significantly wetter past for Venus. Our study analyzes mesospheric (70 to 110 km) temperature, H2O, and HDO profiles taken in solar occultation by SOIR/Venus Express. We observe in…
Revising the Basal Permittivity of the South Polar Layered Deposits of Mars With a Surficial Dust Cover
Kofman, W.; Hérique, A.; Grima, C. +1 more
Bright basal reflections from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) have been proposed to be consistent with permittivities characteristic of a wet material beneath the south polar layered deposits (SPLD). The characterization of a recently formed impact crater highlight the existence of a several meters thick ice…