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Modeling the Emission and Polarization Properties of Pulsating Ultraluminous X-Ray Sources
Israel, G. L.; Turolla, R.; Pintore, F. +4 more
Pulsating Ultraluminous X-ray Sources (PULXs) are a class of extragalactic sources with high X-ray luminosity, in excess of $$ {10}^{39} $$ erg $$ {\mathrm{s}}^{-1} $$, and showing pulsations that associate them with neutron stars accreting at a super-Eddington rate. A simplified model is presented, which describes the thermal emission from an acc…
The environments of radio galaxies and quasars in LoTSS data release 2
van Weeren, R. J.; Rottgering, H. J. A.; Pan, T. +4 more
Aims. The orientation-based unification scheme of radio-loud active galactic nuclei (AGNs) asserts that radio galaxies and quasars are essentially the same type of object, but viewed from different angles. To test this unification model, we compared the environments of radio galaxies and quasars, which would reveal similar properties when an accur…
Investigation Of The Occurrence Of Significant Deviations In The Magnetopause Location: Solar-Wind And Foreshock Effects
Plaschke, Ferdinand; Grimmich, Niklas; Pöppelwerth, Adrian +7 more
Common magnetopause models can predict the location of the magnetopause with respect to upstream conditions from different sets of input parameters, including solar-wind pressure and the interplanetary magnetic field. However, recent studies have shown that some effects of upstream conditions may still be poorly understood since deviations between…
NAROO program: Analysis of USNO Galilean observations 1967–1998
Lainey, V.; Robert, V.; Arlot, J. -E. +1 more
The New Astrometric Reduction of Old Observations (NAROO) program is dedicated to the measurement of astrophotographic plates and the analysis of old observations for scientific purposes. One of the main objectives of the NAROO program is to provide accurate positional measurements of planets and satellites to improve our knowledge of their orbits…
Suzaku Observations of the Cold Front in A3667: A Nonequilibrium Ionization State of the Intracluster Medium
Kohmura, Takayoshi; Uchida, Yuusuke; Shishido, Mona
We present a systematic study of the thermodynamic properties of the intracluster medium (ICM), including the plasma conditions in the ICM, in the merging galaxy cluster A3667 using Suzaku. We analyze the X-ray spectra of the ICM between the northwestern and the southeastern radio relics across a prominent cold front in A3667 to search for the ICM…
Asteroseismic study of subgiants and giants of the open cluster M67 using Kepler/K2: expanded sample and precise masses
Vanderburg, Andrew; Li, Yaguang; Corsaro, Enrico +7 more
Sparked by the asteroseismic space revolution, ensemble studies have been used to produce empirical relations linking observed seismic properties and fundamental stellar properties. Cluster stars are particularly valuable because they have the same metallicity, distance, and age, thus reducing scatter to reveal smoother relations. We present the f…
Conducting high-frequency radio SETI searches using ALMA
Mason, Louisa A.; Garrett, Michael A.; Wandia, Kelvin +1 more
The Atacama Millimeter/Submillimeter Array (ALMA) remains unparalleled in sensitivity at radio frequencies above 35 GHz. In this paper, we explore ALMA's potential for narrow-band technosignature detection, considering factors such as the interferometer's undistorted field of view, signal dilution due to significant drift rates at high frequencies…
Connecting energetic electrons at the Sun and in the heliosphere through X-ray and radio diagnostics
Maksimovic, Milan; Vilmer, Nicole; Krupar, Vratislav +2 more
Context. Solar flares release huge amounts of energy, a considerable part of which is channeled into particle acceleration in the lower corona. Hard X-ray (HXR) emissions are used to diagnose the accelerated electrons that bombard the chromosphere, while type III radio bursts result from energetic electron beams propagating through the corona and …
Solar Variability in the Mg II h and k Lines
Solanki, S. K.; Shapiro, A. I.; Krivova, N. A. +3 more
Solar irradiance and its variations in the ultraviolet (UV) control the photochemistry in Earth's atmosphere and influence Earth's climate. The variability in the Mg II h and k core-to-wing ratio, also known as the Mg II index, is highly correlated with the solar UV irradiance variability. Because of this, the Mg II index is routinely used as a pr…
Revisiting the classics: on the optical colours of novae as standard crayons
Strader, Jay; Chomiuk, Laura; Craig, Peter +9 more
We present a systematic study of the