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High-frequency Magnetic Fluctuations in Space Plasmas and the Role of Electron Landau Damping
Telloni, Daniele; Vecchio, Antonio; Lepreti, Fabio +1 more
While low-frequency plasma fluctuations in the interplanetary space have been successfully described in the framework of classical turbulence, high-frequency fluctuations still represent a challenge for theoretical models. At these scales, kinetic plasma processes are at work, but although some of them have been identified in spacecraft measuremen…
Multimessenger Constraints on Magnetic Fields in Merging Black Hole-Neutron Star Binaries
Haiman, Zoltán; D'Orazio, Daniel J.; Vigna-Gómez, Alejandro +2 more
The LIGO-Virgo-KAGRA Collaboration recently detected gravitational waves (GWs) from the merger of black hole-neutron star (BHNS) binary systems GW200105 and GW200115. No coincident electromagnetic (EM) counterparts were detected. While the mass ratio and BH spin in both systems were not sufficient to tidally disrupt the NS outside the BH event hor…
Metallicity Distribution Function of the Eridanus II Ultra-faint Dwarf Galaxy from Hubble Space Telescope Narrowband Imaging
Dolphin, Andrew E.; Martin, Nicolas; Starkenburg, Else +9 more
We use deep narrowband CaHK (F395N) imaging taken with the Hubble Space Telescope (HST) to construct the metallicity distribution function (MDF) of Local Group ultra-faint dwarf galaxy Eridanus II (Eri II). When combined with archival F475W and F814W data, we measure metallicities for 60 resolved red giant branch stars as faint as m F475W
A Possible 250 s X-Ray Quasi-periodicity in the Fast Blue Optical Transient AT2018cow
Tao, Lian; Zhang, Liang; Shu, Xinwen +11 more
The fast blue optical transients (FBOTs) are a new population of extragalactic transients of unclear physical origin. A variety of mechanisms has been proposed including failed supernova explosion, shock interaction with a dense medium, young magnetar, accretion onto a compact object and stellar tidal disruption event, but none is conclusive. Here…
A First Look into the Nature of JWST/MIRI 7.7 µm Sources from SMACS 0723
Rinaldi, Pierluigi; Caputi, Karina I.; Iani, Edoardo +1 more
Until now, our knowledge of the extragalactic universe at mid-infrared (mid-IR) wavelengths (>5 µm) was limited to rare active galactic nuclei and the brightest normal galaxies up to z ~ 3. The advent of JWST with its Mid-Infrared Instrument (MIRI) will revolutionize the ability of the mid-IR regime as a key wavelength domain to probe the…
Distance and age of the massive stellar cluster Westerlund 1. I. Parallax method using Gaia-EDR3
Damineli, Augusto; Navarete, Felipe; Almeida, Leonardo A. +2 more
Westerlund 1 (Wd 1) is one of the most massive young star clusters in the Milky Way. Although relevant for star formation and evolution, its fundamental parameters are not yet very well constrained. We aim to derive an accurate distance and provide constraints on the cluster age. We used the photometric and astrometric information available in the…
HST/WFC3 Complete Phase-resolved Spectroscopy of White-dwarf-brown-dwarf Binaries WD 0137 and EPIC 2122
Mayorga, L. C.; Lothringer, Joshua D.; Apai, Dániel +7 more
Brown dwarfs in close-in orbits around white dwarfs offer an excellent opportunity to investigate properties of fast-rotating, tidally locked, and highly irradiated atmospheres. We present Hubble Space Telescope Wide Field Camera 3 G141 phase-resolved observations of two brown-dwarf-white-dwarf binaries: WD 0137-349 and EPIC 212235321. Their 1.1-1…
Microlensing Events in the Galactic Plane Using the Zwicky Transient Facility
Duev, Dmitry A.; Riddle, Reed; Mróz, Przemek +10 more
Microlensing is a powerful technique to study the Galactic population of "dark" objects such as exoplanets both bound and unbound, brown dwarfs, low-luminosity stars, old white dwarfs, and neutron stars, and it is almost the only way to study isolated stellar-mass black holes. The majority of previous efforts to search for gravitational microlensi…
The OmegaWhite survey for short-period variable stars - VII. High amplitude short-period blue variables
Ramsay, Gavin; Buckley, David A. H.; Kupfer, Thomas +11 more
Blue Large-Amplitude Pulsators (BLAPs) are a relatively new class of blue variable stars showing periodic variations in their light curves with periods shorter than a few tens of minutes and amplitudes of more than 10 per cent. We report nine blue variable stars identified in the OmegaWhite survey conducted using ESO's VST, which shows a periodic …
The tidal evolution of the Fornax dwarf spheroidal and its globular clusters
Fattahi, Azadeh; Navarro, Julio F.; Errani, Raphaël +2 more
The dark matter content of the Fornax dwarf spheroidal galaxy inferred from its kinematics is substantially lower than expected from LCDM cosmological simulations. We use N-body simulations to examine whether this may be the result of Galactic tides. We find that, despite improved proper motions from the Gaia mission, the pericentric distance of F…