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X-ray Emission and Orientation of Selected PF Galaxy Clusters
Tugay, A. V.; Dylda, S. S.; Panko, E. A.
X-ray counterparts for 35 galaxy clusters contained in the PF catalogue of galaxy clusters and groups were found in XMM-Newton archive. 22 ones (all from ACO catalogue) have extended elliptic X-ray haloes appropriate for determination of orientation. Position angles and eccentricities were calculated and compared with cluster orientations optical …
Distinct characteristics of asymmetric magnetic reconnections: Observational results from the exhaust region at the dayside magnetopause
Zhang, Y. C.
Magnetic reconnection plays a key role in the conversion of magnetic energy into the thermal and kinetic energy of plasma. On either side of the diffusion region in space plasma, the conditions for the occurrence of reconnections are usually not symmetric. Previous theoretical studies have predicted that reconnections under asymmetric conditions w…
A study of cosmic ray flux based on the noise in raw CCD data from solar images
Qin, G.; Shen, Z. -N.
Raw solar images from CCDs are often contaminated with single-pixel noise which is thought to be made by cosmic ray hits. The cosmic ray-affected pixels are usually outstanding when compared with the perimeter zone. In this work, we use a method based on the median filtering algorithm to identify and count the cosmic ray traces from SOHO/EIT solar…
Hubble Space Telescope Observations of Active Asteroid 324P/La Sagra
Mutchler, Max; Jewitt, David; Agarwal, Jessica +3 more
Hubble Space Telescope observations of active asteroid 324P/La Sagra near perihelion show continued mass loss consistent with the sublimation of near-surface ice. Isophotes of the coma measured from a vantage point below the orbital plane are best matched by steady emission of particles having a nominal size of a ∼ 100 µm. The inferred rate …
X-rays from magnetic intermediate mass Ap/Bp stars
Robrade, Jan
The X-ray emission of magnetic intermediate mass Ap/Bp stars is reviewed and put into context of intrinsic as well as extrinsic hypotheses for its origin. New X-ray observations of Ap/Bp stars are presented and combined with an updated analysis of the available datasets, providing the largest sample of its type that is currently available. In the …
XMM-Newton study of the Draco dwarf spheroidal galaxy
Sasaki, Manami; Saeedi, Sara; Ducci, Lorenzo
Aims: We present the results of the analysis of five XMM-Newton observations of the Draco dwarf spheroidal galaxy (dSph). The aim of the work is the study of the X-ray population in the field of the Draco dSph.
Methods: We classified the sources on the basis of spectral analysis, hardness ratios, X-ray-to-optical flux ratio, X-ray variab…
Analytical model of Europa's O2 exosphere
Mura, Alessandro; Plainaki, Christina; Milillo, Anna +5 more
The origin of the exosphere of Europa is its water ice surface. The existing exosphere models, assuming either a collisionless environment (simple Monte Carlo techniques) or a kinetic approach (Direct Monte Carlo Method) both predict that the major constituent of the exosphere is molecular oxygen. Specifically, O2 is generated at the su…
Calibration of the Voyager Ultraviolet Spectrometers and the Composition of the Heliosphere Neutrals: Reassessment
Holberg, J. B.; Ben-Jaffel, Lotfi
The data harvest from the Voyagers’ (V 1 and V 2) Ultraviolet Spectrometers (UVS) covers encounters with the outer planets, measurements of the heliosphere sky-background, and stellar spectrophotometry. Because their period of operation overlaps with many ultraviolet missions, the calibration of V1 and V2 UVS with other spectrometers is invaluable…
X-ray deficiency on strongly accreting T Tauri stars. Comparing Orion with Taurus
Bouy, H.; Manara, C. F.; Merín, B. +3 more
Context. Depending on whether a T Tauri star accretes material from its circumstellar disk or not, different X-ray emission properties can be found. The accretion shocks produce cool heating of the plasma, contributing to the soft X-ray emission from the star.
Aims: Using X-ray data from the Chandra Orion Ultra-deep Project and accretion rate…
Solution structure of the isolated histone H2A-H2B heterodimer
Moriwaki, Yoshihito; Yamane, Tsutomu; Ohtomo, Hideaki +6 more
During chromatin-regulated processes, the histone H2A-H2B heterodimer functions dynamically in and out of the nucleosome. Although detailed crystal structures of nucleosomes have been established, that of the isolated full-length H2A-H2B heterodimer has remained elusive. Here, we have determined the solution structure of human H2A-H2B by NMR coupl…