Search Publications
Properties of Milky Way globular clusters associated with X-ray sources
Nedialkov, Petko; Botev, Svetoslav; Petrov, Georgi P.
The integral X-ray luminosities of 89 Milky Way Globular Clusters within 2 core radii rc have been estimated using the average X-ray fluxes of individual sources detected in the recent Chandra, XMM-Newton or Swift missions. The X-ray luminosity function is constructed and a limit luminosity LX([0.5-7] keV) = 1033.65
CO in the Draco nebula: the atomic-molecular transition
Bieging, John H.; Kong, Shuo
This paper presents maps of the J=2-1 transition of CO towards the Draco nebula intermediate-velocity cloud (IVC). The maps cover 8500 square arcmin with a velocity resolution of 0.33 km s$^{-1}$ and angular resolution of 38 ${\rm arcsec}$, or 0.11 pc at the cloud distance of 600 pc. The mapped area includes all the emission detected by the Hersch…
Seasonal Variation of the Martian Dayside Ionosphere
Zhai, Haohui; Ruan, Haibing
The Martian ionosphere has many similarities and differences compared to Earth, attracting significant attention. This paper utilizes radio occultation data from the Mars Global Surveyor (MGS), Mars Atmosphere and Volatile Evolution Mission (MAVEN), and ESA Mars Express mission (MEX), associated with the measurements from Mars Advanced Radar for S…
Properties of Galactic B[e] Supergiants. X. Refined Orbit and Fundamental Parameters of the HD 327083 Binary System
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +5 more
HD 327083 is a binary system that consists of two supergiant components and exhibits the B[e] phenomenon. In this paper, we report the determination of a new set of the system's fundamental parameters using a combination of photometric and spectroscopic data as well as the Gaia EDR3 distance. We found that the orbital period of the system is 107.6…
Visual Orbits of Wolf–Rayet Stars. II. The Orbit of the Nitrogen-rich Wolf–Rayet Binary WR 138 Measured with the CHARA Array
Moffat, Anthony F. J.; Monnier, John D.; Schaefer, Gail H. +19 more
Classical Wolf–Rayet (WR) stars are descendants of massive OB-type stars that have lost their hydrogen-rich envelopes and are in the final stages of stellar evolution, possibly exploding as Type Ib/c supernovae. It is understood that the mechanisms driving this mass loss are either strong stellar winds and or binary interactions, so intense studie…
Wind Speed Variations at the Venus Cloud Top above Aphrodite Terra According to Long-term UV Observations by VMC/VENUS Express and UVI/AKATSUKI
Ignatiev, N. I.; Zasova, L. V.; Titov, D. V. +4 more
Series of consecutive UV (365 nm) images of Venus cloud coverage provide a way to investigate dynamics of the mesosphere. An unprecedented series of such images was obtained by the VMC/Venus Express (ESA) and UVI/Akatsuki (JAXA) cameras from 2006 to 2022. At 10°S long-term variations in the mean zonal and meridional wind speed are observed with a …
Exploration of a Dissolving Association Made Up of IC 2602, Tucana–Horologium, and Other Young Comoving Groups
Kiman, Rocio; Faherty, Jacqueline K.; Gagné, Jonathan +11 more
Recently Gagné et al. suggested that young moving groups with similar kinematic properties could be part of larger dissolving structures. One example was IC 2602 as the core of a group of associations, including its corona (CIC 2602), Tucana-Horologium (THA), and parts of Theia 92. We explore this hypothesis by measuring the rotation periods of 95…
A full reconstruction of two galaxy clusters intra-cluster medium with strong gravitational lensing
Lewis, Geraint F.; Mahler, Guillaume; Hilton, Matt +6 more
Whilst X-rays and Sunyaev-Zel'dovich observations allow to study the properties of the intra-cluster medium (ICM) of galaxy clusters, their gravitational potential may be constrained using strong gravitational lensing. Although being physically related, these two components are often described with different physical models. Here, we present a uni…
The Diffusion Tensor of Protons at 1 au: Comparing Simulation, Observation, and Theory
Engelbrecht, N. E.; Strauss, R. D.; Lang, J. T. +1 more
The natural variation in plasma parameters observed at 1 au can lead to a variation in transport parameters, such as diffusion and drift coefficients, for energetic charged particles of solar and galactic origin. Given the importance of these parameters to particle transport studies, this variation is investigated through test particle simulations…
The X-ray mysteries of neutron stars and white dwarfs
Rea, Nanda; Schartel, Norbert
These two types of compact objects share several similarities, despite their different compositions. A short workshop in Spain brought communities together to share understanding of dense matter under extreme conditions.