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The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey. III. The Perseus-Pisces supercluster and the Southern Great Wall as traced by X-ray luminous galaxy clusters
Böhringer, Hans; Chon, Gayoung; Trümper, Joachim
The Perseus-Pisces supercluster is known as one of the largest structures in the nearby Universe that has been charted by the galaxy and galaxy cluster distributions. For the latter mostly clusters from the Abell catalogue have been used. Here we take a new approach to a quantitative characterisation of the Perseus-Pisces supercluster using a stat…
The QuaStar Survey: Detecting Hidden Low-velocity Gas in the Milky Way's Circumgalactic Medium
Werk, Jessica K.; Zheng, Yong; Peek, Joshua +2 more
From our position embedded within the Milky Way's interstellar medium, we have limited ability to detect gas at low relative velocities in the extended Galactic halo because those spectral lines are blended with much stronger signals from dense foreground gas. As a result, the content of the Milky Way's circumgalactic medium (CGM) is poorly constr…
The Spacecraft Wake: Interference With Electric Field Observations and a Possibility to Detect Cold Ions
Eriksson, Anders I.; Khotyaintsev, Yuri V.; André, Mats +1 more
Wakes behind spacecraft caused by supersonic drifting positive ions are common in plasmas and disturb in situ measurements. We review the impact of wakes on observations by the Electric Field and Wave double-probe instruments on the Cluster satellites. In the solar wind, the equivalent spacecraft charging is small compared to the ion drift energy …
Revealing a New Black Widow Binary 4FGL J0336.0+7502
Kong, Albert K. H.; Li, Kwan-Lok; Jane Yap, Y. X. +1 more
We report on the discovery of a promising candidate for a black widow (BW) millisecond pulsar binary, 4FGL J0336.0+7502, which shows many pulsar-like properties in the 4FGL-DR2 catalog. Within the 95% error region of the LAT source, we identified an optical counterpart with a clear periodicity at Porb = 3.718178(9) hr using the Bohyunsa…
White dwarf-open cluster associations based on Gaia DR2
Paunzen, E.; Prišegen, M.; Piecka, M. +2 more
Context. Fundamental parameters and physical processes leading to the formation of white dwarfs (WDs) may be constrained and refined by discovering WDs in open clusters (OCs). Cluster membership can be utilized to establish the precise distances, luminosities, ages, and progenitor masses of such WDs.
Aims: We compile a list of probable WDs th…
Multi-spacecraft study of the solar wind at solar minimum: Dependence on latitude and transient outflows
Fedorov, A.; Eastwood, J. P.; Owens, M. J. +15 more
Context. The recent launches of Parker Solar Probe, Solar Orbiter (SO), and BepiColombo, along with several older spacecraft, have provided the opportunity to study the solar wind at multiple latitudes and distances from the Sun simultaneously.
Aims: We take advantage of this unique spacecraft constellation, along with low solar activity acro…
Online data analysis system of the INTEGRAL telescope
Paltani, S.; Tramacere, A.; Ferrigno, C. +3 more
Context. During more than 17 years of operation in space, the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) telescope has accumulated a large data set that contains records of hard X-ray and soft γ-ray astronomical sources. These data can be reused in the context of multi-wavelength or multi-messenger studies of astronomical sources a…
Chromospheric Activity of Periodic Variable Stars Based on the LAMOST Low- and Medium-resolution Spectral Survey
Shi, Jianrong; Han, Xianming L.; Zhang, Li-yun +5 more
We present a catalog of 75,867 periodic variable stars from data release 7 of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. We calculated the chromospheric activity index, equivalent widths for 201,349 spectra, and excess fractional luminosity ( ${R}_{{\rm{H}}\alpha }^{{\prime} }$ ) for 130,796 spectra. Based on the intensity of t…
Double X/Peanut structures in barred galaxies - insights from an N-body simulation
Ciambur, Bogdan C.; Fragkoudi, Francesca; Khoperskov, Sergey +2 more
Boxy, peanut-, or X-shaped 'bulges' are observed in a large fraction of barred galaxies viewed in, or close to, edge-on projection, as well as in the Milky Way. They are the product of dynamical instabilities occurring in stellar bars, which cause the latter to buckle and thicken vertically. Recent studies have found nearby galaxies that harbour t…
Empirical Selection of Auroral Kilometric Radiation During a Multipoint Remote Observation With Wind and Cassini
Jackman, C. M.; Bonnin, X.; Cecconi, B. +5 more
Auroral Kilometric Radiation (AKR) is terrestrial radio emission that originates in particle acceleration regions along magnetic field lines, coinciding with discrete auroral arcs. AKR viewing geometry is complex due to the confinement of the source regions to nightside local times (LTs) and the anisotropy of the beaming pattern, so observations a…