Search Publications
Thermal instability and non-equilibrium in solar coronal loops: from coronal rain to long-period intensity pulsations
Antolin, Patrick
The complex interaction of the magnetic field with matter is the key to some of the most puzzling observed phenomena at multiple scales across the Universe, from tokamak plasma confinement experiments in the laboratory to the filamentary structure of the interstellar medium. A major astrophysical puzzle is the phenomenon of coronal heating, upon w…
The KBC void and Hubble tension contradict ΛCDM on a Gpc scale - Milgromian dynamics as a possible solution
Kroupa, Pavel; Haslbauer, Moritz; Banik, Indranil
The KBC void is a local underdensity with the observed relative density contrast δ ≡ 1 - ρ/ρ0 = 0.46 ± 0.06 between 40 and 300 Mpc around the Local Group. If mass is conserved in the Universe, such a void could explain the 5.3σ Hubble tension. However, the MXXL simulation shows that the KBC void causes 6.04σ tension with standard cosmol…
The Pristine survey - X. A large population of low-metallicity stars permeates the Galactic disc
Sestito, Federico; Navarro, Julio F.; Malhan, Khyati +26 more
The orbits of the least chemically enriched stars open a window on the formation of our Galaxy when it was still in its infancy. The common picture is that these low-metallicity stars are distributed as an isotropic, pressure-supported component since these stars were either accreted from the early building blocks of the assembling Milky Way (MW),…
The ALMA Spectroscopic Survey in the HUDF: Deep 1.2 mm Continuum Number Counts
Carilli, Chris; Smail, Ian; Daddi, Emanuele +20 more
We present the results from the 1.2 mm continuum image obtained as part of the Atacama Large Millimeter/submillimeter Array Spectroscopic Survey in the Hubble Ultra Deep Field. The 1.2 mm continuum image has a size of 2.9 (4.2) arcmin2 within a primary beam response of 50% (10%) and an rms value of $9.3\,\mu \mathrm{Jy}\,{\mathrm{beam}}…
Modeling Dust and Starlight in Galaxies Observed by Spitzer and Herschel: The KINGFISH Sample
Helou, G.; Boquien, M.; Roussel, H. +30 more
Interstellar dust and starlight are modeled for the galaxies of the project "Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel." The galaxies were observed by the Infrared Array Camera and the Multiband Imaging Photometer for Spitzer on Spitzer Space Telescope, and the Photodetector Array Camera and Spectrometer and the Spectral…
New Grids of Pure-hydrogen White Dwarf NLTE Model Atmospheres and the HST/STIS Flux Calibration
Rauch, Thomas; Hubeny, Ivan; Bohlin, Ralph C.
Nonlocal thermodynamic equilibrium (NLTE) calculations of hot white dwarf (WD) model atmospheres are the cornerstone of modern flux calibrations for the Hubble Space Telescope and for the CALSPEC database. These theoretical spectral energy distributions (SEDs) provide the relative flux versus wavelength, and only the absolute flux level remains to…
Rotation of Low-mass Stars in Taurus with K2
Bouvier, J.; Rebull, L. M.; Stauffer, J. R. +4 more
We present an analysis of K2 light curves (LCs) from Campaigns 4 and 13 for members of the young (∼3 Myr) Taurus association, in addition to an older (∼30 Myr) population of stars that is largely in the foreground of the Taurus molecular clouds. Out of 156 of the highest-confidence Taurus members, we find that 81% are periodic. Our sample of young…
A He I upper atmosphere around the warm Neptune GJ 3470 b
Alonso-Floriano, F. J.; Sánchez-López, A.; López-Puertas, M. +24 more
High resolution transit spectroscopy has proven to be a reliable technique for the characterization of the chemical composition of exoplanet atmospheres. Taking advantage of the broad spectral coverage of the CARMENES spectrograph, we initiated a survey aimed at characterizing a broad range of planetary systems. Here, we report our observations of…
Dynamical friction in a Fuzzy Dark Matter universe
Spergel, David N.; Lisanti, Mariangela; Lancaster, Lachlan +3 more
We present an in-depth exploration of the phenomenon of dynamical friction in a universe where the dark matter is composed entirely of so-called Fuzzy Dark Matter (FDM), ultralight bosons of mass m~Script O(10-22) eV . We review the classical treatment of dynamical friction before presenting analytic results in the case of FDM for point…
AGN Feedback and Star Formation of Quasar Host Galaxies: Insights from the Molecular Gas
Ho, Luis C.; Bauer, Franz E.; Treister, Ezequiel +2 more
Molecular gas serves as a key probe of the complex interplay between black hole accretion and star formation in the host galaxies of active galactic nuclei (AGNs). We use CO(2-1) observations from a new Atacama Large Millimeter/submillimeter Array survey, in conjunction with literature measurements, to investigate the molecular gas properties of a…