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Unexpected energetic particle observations near the Sun by Parker Solar Probe and Solar Orbiter
McComas, D. J.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +6 more
Solar energetic particles (SEPs) from suprathermal (few keV) up to relativistic (∼few GeV) energies are accelerated at the Sun in association with solar flares and coronal mass ejection-driven shock waves. Although our knowledge of the origin, acceleration, and transport of these particles from close to the Sun through the interplanetary medium ha…
Scaling relations of X-ray luminous clusters in the Hyper Suprime-Cam Subaru Strategic Program field
Fukazawa, Yasushi; Okabe, Nobuhiro; Poon, Helen +2 more
We present the XMM-Newton X-ray analysis of 19 X-ray luminous galaxy clusters of low- to mid-redshift (<0.4) selected from the MCXC (Meta-Catalog of X-Ray Detected Clusters of Galaxies) cluster catalogue in the Hyper Suprime-Cam Subaru Strategic Programme field. We derive the hydrostatic equilibrium mass and study scaling relations using (i) th…
Effects of coronal mass ejection orientation on its propagation in the heliosphere
Temmer, M.; Vršnak, B.; Dumbović, M. +3 more
Context. In the scope of space weather forecasting, it is crucial to be able to more reliably predict the arrival time, speed, and magnetic field configuration of coronal mass ejections (CMEs). From the time a CME is launched, the dominant factor influencing all of the above is the interaction of the interplanetary CME (ICME) with the ambient plas…
Material around the Centaur (2060) Chiron from the 2018 November 28 UT Stellar Occultation
Bosh, Amanda S.; Person, Michael J.; Levine, Stephen E. +5 more
A stellar occultation of Gaia DR3 2646598228351156352 by the Centaur (2060) Chiron was observed from the South African Astronomical Observatory on 2018 November 28 UT. Here we present a positive detection of material surrounding Chiron from the 74-inch telescope for this event. Additionally, a global atmosphere is ruled out at the tens of microbar…
The MeerKAT Galaxy Clusters Legacy Survey: star formation in massive clusters at 0.15 < z < 0.35
Knowles, K.; Clarke, T. E.; Hilton, M. +5 more
We investigate dust-unbiased star formation rates (SFRs) as a function of the environment in 20 massive clusters ($M_{200}\gt 4\times 10^{14}\, {\rm M}_{\odot }$) between 0.15 < $z$ < 0.35 using radio luminosities (L1.4GHz) from the recently released MeerKAT Galaxy Cluster Legacy Survey catalogue. We use optical data from the Dark…
N2/CO ratio in comets insensitive to orbital evolution
Mousis, O.; Jehin, E.; Anderson, S. E. +2 more
Comets are seen as depleted in nitrogen compared to the protosolar value, but a small number exhibit significantly higher than typical N2/CO ratios: C/1908 R1 (Morehouse), C/1940 R2 (Cunningham), C/1947 S1 (Bester), C/1956 R1 (Arend-Roland), C/1957 P1 (Mrkos), C/1961 R1 (Humason), C/1969 Y1 (Bennett), C/1973 E1 (Kohoutek), C/1975 V1-A (…
Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly α emitters and IGM transmission in the COSMOS field at z ∼ 5
Ono, Yoshiaki; Ouchi, Masami; Hennawi, Joseph F. +5 more
We present a novel technique called 'photometric IGM tomography' to map the intergalactic medium (IGM) at z ≃ 4.9 in the COSMOS field. It utilizes deep narrow-band (NB) imaging to photometrically detect faint Ly α forest transmission in background galaxies across the Subaru/Hyper-Suprime Cam (HSC)'s $1.8\rm \, sq.\, deg$ field of view and locate L…
Effects of Airless Bodies' Regolith Structures and of the Solar Wind's Properties on the Backscattered Energetic Neutral Atoms Flux
Verkercke, S.; Chaufray, J. -Y.; Leblanc, F. +4 more
The surfaces of airless planetary bodies, such as the Moon or Mercury, are covered with regoliths, which interact with the solar wind. The solar protons can either be absorbed by the surface or neutralized and reflected as hydrogen energetic neutral atoms (ENAs). The ENA flux is thought to depend mostly on the structure of the upper regolith layer…
The vertex coordinates of the Galaxy's stellar systems according to the Gaia DR3 catalogue
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +2 more
We present the results of determining the coordinates of the vertices of various stellar systems, the centroids of which are located in the Galactic plane. To do this, the positions, parallaxes, proper motions, and radial velocities of red giants and subgiants contained in the Gaia DR3 catalogue have been used. When determining the components of t…
Cosmic-CoNN: A Cosmic-Ray Detection Deep-learning Framework, Data Set, and Toolkit
Howell, D. Andrew; McCully, Curtis; Xu, Chengyuan +2 more
Rejecting cosmic rays (CRs) is essential for the scientific interpretation of CCD-captured data, but detecting CRs in single-exposure images has remained challenging. Conventional CR detectors require experimental parameter tuning for different instruments, and recent deep-learning methods only produce instrument-specific models that suffer from p…