Search Publications
Diagnostics of the solar coronal plasmas by magnetohydrodynamic waves: magnetohydrodynamic seismology
Nakariakov, Valery M.; Yuan, Ding; Kolotkov, Dmitrii Y. +3 more
Macroscopic wave and oscillatory phenomena ubiquitously detected in the plasma of the corona of the Sun are interpreted in terms of magnetohydrodynamic theory. Fast and slow magnetoacoustic waves are clearly distinguished in observations. Properties of coronal magnetohydrodynamic waves are determined by local parameters of the plasma, including th…
Atomic diffusion and mixing in old stars - VIII. Chemical abundance variations in the globular cluster M4 (NGC 6121)
Korn, A. J.; Nordlander, T.; Gruyters, P. +1 more
Variations in chemical abundances with evolutionary phase have been identified among stars in globular and open clusters with a wide range of metallicities. In the metal-poor clusters, these variations compare well with predictions from stellar structure and evolution models considering the internal diffusive motions of atoms and ions, collectivel…
Simulation-based inference of deep fields: galaxy population model and redshift distributions
Tortorelli, Luca; Refregier, Alexandre; Kacprzak, Tomasz +3 more
Accurate redshift calibration is required to obtain unbiased cosmological information from large-scale galaxy surveys. In a forward modelling approach, the redshift distribution n(z) of a galaxy sample is measured using a parametric galaxy population model constrained by observations. We use a model that captures the redshift evolution of the gala…
Dust beyond the torus: revealing the mid-infrared heart of local Seyfert ESO 428-G14 with JWST/MIRI
Gandhi, Poshak; Alonso-Herrero, Almudena; Ward, Martin +34 more
Polar dust has been discovered in a number of local active galactic nuclei (AGN), with radiation-driven torus models predicting a wind to be its main driver. However, little is known about its characteristics, spatial extent, or connection to the larger scale outflows. We present the first JWST/MIRI study aimed at imaging polar dust by zooming on …
Improving metallicity estimates for very metal-poor stars in the Gaia DR3 GSP-Spec catalog
Helmi, Amina; Matsuno, Tadafumi; Starkenburg, Else +1 more
Context. In the latest Gaia Data Release (DR3), the GSP-Spec module has provided stellar parameters and chemical abundances measured from the RVS spectra alone. However, the GSP-Spec parameters - including metallicity - for very metal-poor (VMP; [Fe/H] < −2) stars suffer from parameter degeneracy due to a lack of information in their spectra, a…
Exposing Line Emission: The Systematic Differences of Measuring Galaxy Stellar Masses with JWST NIRCam Medium versus Wide Band Photometry
Willott, Chris J.; Martis, Nicholas S.; Bradač, Maruša +15 more
Photometrically derived stellar masses are known to suffer from systematic uncertainties, particularly due to nebular emission contributions to the spectral energy distribution (SED). Using James Webb Space Telescope NIRCam imaging from the CAnadian NIRISS Unbiased Cluster Survey, we introduce a comparison study of photometrically derived redshift…
Quenching-driven equatorial depletion and limb asymmetries in hot Jupiter atmospheres: WASP-96b example
Feinstein, Adina D.; Taylor, Jake; Radica, Michael +11 more
Transport-induced quenching in hot Jupiter atmospheres is a process that determines the boundary between the part of the atmosphere at chemical equilibrium and the part of the atmosphere at thermochemical (but not photothermochemical) disequilibrium. The location of this boundary, the quench level, depends on the interplay between the dynamical an…
Discovery of a > 13 Mpc long X-ray filament between two galaxy clusters beyond three times their virial radii
Pacaud, F.; Reiprich, T. H.; Dolag, K. +5 more
Context. A significant fraction of the missing baryons in the local Universe is expected to reside in large-scale filaments that may be observable in soft X-ray emission. Until now, however, very few candidate emission filaments have been found in individual systems, and none beyond three times the virial radius of the clusters at the nodes of the…
JASMINE: Near-infrared astrometry and time-series photometry science
Ouchi, Masami; Isobe, Naoki; Notsu, Yuta +86 more
The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science goals. One is Galactic archaeology with a Galactic Center survey, which aims to reveal the Milky Way's central…
Project Hephaistos - II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
Wright, Jason T.; Zackrisson, Erik; Korn, Andreas J. +5 more
The search for extraterrestrial intelligence is currently being pursued using multiple techniques and in different wavelength bands. Dyson spheres, megastructures that could be constructed by advanced civilizations to harness the radiation energy of their host stars, represent a potential technosignature, that in principle may be hiding in public …