Search Publications
Euclid view of the dusty star-forming galaxies at ≳ detected in wide area submillimetre surveys
Cai, Zhen-Yi; Mitra, Dipanjan; Negrello, Mattia +1 more
We investigate the constraints provided by the Euclid space observatory on the physical properties of dusty star-forming galaxies (DSFGs) at $z\gtrsim 1.5$ detected in wide area submillimetre surveys with Herschel. We adopt a physical model for the high-z progenitors of spheroidal galaxies, which form the bulk of DSFGs at $z\gtrsim 1.5$. We improv…
Detecting the Effect of Nonthermal Sources on the Warm-hot Galactic Halo
Das, Sanskriti
We report the first detection of nonthermal broadening of O VII lines in the warm-hot ≈106 K circumgalactic medium of the Milky Way. We use z = 0 absorption of O VII Kα, O VII Kβ, and O VIII Kα lines in archival grating data of b > 15° quasar sightlines from Chandra and XMM-Newton. Nonthermal line broadening is evident in two-thirds …
EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season
Chaffin, Michael S.; Halekas, Jasper S.; Brain, David A. +14 more
We present a comprehensive study of the nightside aurora phenomenon on Mars, utilizing observations from EMUS onboard Emirates Mars Mission. The oxygen emission at 130.4 nm is by far the brightest FUV auroral emission line observed at Mars. Our statistical analysis reveals geographic, solar zenith angle, local time, and seasonal dependencies of au…
Mapping Multiphase Metals in Star-forming Galaxies: A Spatially Resolved UV+Optical Study of NGC 5253
Kumari, Nimisha; Hernandez, Svea; Aloisi, Alessandra +4 more
We present a pioneering, spatially resolved, multiphase gas abundance study on the blue compact dwarf galaxy NGC 5253, targeting 10 star-forming (SF) clusters inside six far-UV (FUV) Hubble Space Telescope/Cosmic Origins Spectrograph (COS) pointings with cospatial optical Very Large Telescope/MUSE observations throughout the galaxy. The SF regions…
Recent advances in solar data-driven MHD simulations of the formation and evolution of CME flux ropes
Poedts, Stefaan; Schmieder, Brigitte; Guo, Jinhan
Filament eruptions and coronal mass ejections are physical phenomena related to magnetic flux ropes carrying electric current. A magnetic flux rope is a key structure for solar eruptions, and when it carries a southward magnetic field component when propagating to the Earth. It is the primary driver of strong geomagnetic storms. As a result, devel…
A comprehensive study of orbital evolution of LMC X-4: existence of a second derivative of the orbital period
Paul, Biswajit; Jain, Chetana; Sharma, Rahul
We report here results from pulse arrival time delay analysis of the eclipsing high-mass X-ray binary (HMXB) pulsar LMC X-4 using observations made with the Rossi X-ray Timing Explorer, XMM-Newton, NuSTAR (Nuclear Spectroscopic Telescope ARray), and AstroSat. Combining the orbital parameters determined from these observations with the historical m…
Binary central stars of planetary nebulae in the Large Magellanic Cloud
Soszyński, I.; Smolec, R.; Szczerba, R. +2 more
Context. Close binary central stars of planetary nebulae (PNe) must have formed through a common envelope evolution during the giant phase experienced by one of the stars. Transfer of the angular momentum from the binary system to the envelope leads to the shortening of the binary separations from the radius of red giant to the radius of the order…
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…