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The jet paths of radio active galactic nuclei and their cluster weather
Finoguenov, A.; Heywood, I.; Hardcastle, M. J. +21 more
We studied bent radio sources within X-ray galaxy groups in the COSMOS and XMM-LSS fields. The radio data were obtained from the MeerKAT International GHz Tiered Extragalactic Explorations data release 1 (MIGHTEE-DR1) at 1.2–1.3 GHz, with angular resolutions of 8.9″ and 5″, and median noise levels of rmsmed ∼ = 3.5 and 5.5 µJy/bea…
Juno Observations of Langmuir Waves in Association with Interplanetary Shocks from ~1.3 to ~5.4 au
Cattell, C.; Elliott, S.; Hanson, E. L. M. +1 more
Langmuir waves are often observed upstream of planetary bow shocks and interplanetary (IP) shocks. Waveform capture (WFC) measurements, obtained during Juno's cruise phase, reveal the occurrence of Langmuir waves, as well as other wave modes, in association with IP shocks and IP coronal mass ejections (ICMEs) at distances from ∼1.3 to ∼5.4 au. Thi…
A new look at disk winds and external photoevaporation in the σ-Orionis cluster
Bayo, A.; Alcalá, J. M.; Hernández, J. +12 more
Context. Disk winds play a crucial role in the evolution of protoplanetary disks. Typical conditions for star and planet formation are in regions with intermediate or strong UV radiation fields produced by massive stars. In these environments, internally or externally driven winds can occur. The σ-Orionis cluster is the ideal site to study disk wi…
Beyond Accretion Limits: The Rise of Pulsating Gems
Wolter, Anna; Pintore, Fabio; Esposito, Paolo +23 more
The discovery of several ultraluminous X-ray sources exhibiting fast and rapidly evolving X-ray pulsations unequivocally associates these sources with accreting neutron stars orbiting relatively massive companion stars (> 8M$$ {}_{\odot } $$). Among these ULXs, the brightest pulsating ULX (PULX), NGC 5907 ULX-1, displays a peak luminosity (~2 ×…
Force Analysis of Venus's Induced Magnetosphere: A Multifluid Hall–Magnetohydrodynamics Study
Cao, Jinbin; Ge, Yasong; Lu, Haoyu +8 more
Understanding which processes control atmospheric escape and the loss of water from planetary environments is crucial. The ESA's Venus Express spacecraft has observed a significant depletion in Venus's upper atmosphere, driven by the solar wind. In such scenarios, the electromagnetic force can accelerate planetary ions to energies that allow them …
Variations in Venusian magnetic topology during an interplanetary coronal mass ejection passage: A multifluid magnetohydrodynamics study
Cao, Jinbin; Mazelle, Christian; Ge, Yasong +7 more
The global effects on Venusian magnetic topology and ion escape during the significant solar-wind disturbances caused by the interplanetary coronal mass ejection (ICME) remain an open area of research. This study examined a particularly intense ICME interaction with Venus on November 5, 2011, using a global multifluid magnetohydrodynamics (MHD) mo…
starkiller: Subtracting Stars and Other Sources from IFU Spectroscopic Data Through Forward Modeling
Bannister, Michele T.; Nordlander, Thomas; Ridden-Harper, Ryan +1 more
We present starkiller, an open-source Python package for forward-modeling flux retrieval from integral field unit (IFU) spectrograph data cubes. starkiller simultaneously provides stellar spectral classification, relative velocity, and line-of-sight extinction for all sources in a catalog, alongside a source-subtracted data cube. It performs synth…
MAR: A Multiband Astronomical Reduction package
Sodré, L.; Menéndez-Delmestre, K.; Perottoni, H. D. +9 more
The Multiband Astronomical Reduction (MAR) is a multithreaded data reduction pipeline designed to handle raw astronomical images from the Southern Photometric Local Universe Survey, transforming them into frames that are ready for source extraction, photometry and flux calibration. MAR is a complete software written almost entirely in Python, with…
Quasi-parallel Antisunward-propagating Whistler Waves Associated with the Electron Deficit in the Near-Sun Solar Wind: Particle-in-cell Simulation
Verscharen, Daniel; Coburn, Jesse T.; Innocenti, Maria Elena +1 more
In situ observations of the solar wind have shown that the electron velocity distribution function (VDF) consists of a quasi-Maxwellian core, comprising most of the electron population, and two sparser components: the halo, which are suprathermal and quasi-isotropic electrons, and an escaping beam population, the strahl. Recent Parker Solar Probe …
Spectroscopic diagnosis of a B-class flare and an associated filament eruption
Kayshap, Pradeep; Babu, B. Suresh; Tripathi, Sharad C.
The flare ribbon and an associated filament eruption are diagnosed using O IV 1401.16 Å, Si IV 1402.77 Å, and Mg II k 2796.35 Å spectral lines provided by Interface Region Imaging Spectrograph (IRIS). The flare ribbons have downflow (redshifts) in all these lines, and this redshift decreases from the transition region to the chromosphere. While th…