Search Publications
Structure of the W3A Low-density Foreground Region
Seo, Youngmin; Goldsmith, Paul. F.; Stutzki, Jürgen +5 more
We present analysis of [O I] 63 µm and CO J = 5 - 4 and 8 - 7 multiposition data in the W3A region and use it to develop a model for the extended low-density foreground gas that produces absorption features in the [O I] and J = 5 - 4 CO lines. We employ the extinction to the exciting stars of the background H II region to constrain the total…
Prediction of Proton Pressure in the Outer Part of the Inner Magnetosphere Using Machine Learning
Mouikis, C. G.; Kronberg, E. A.; Li, S. Y. +3 more
The information on plasma pressure in the outer part of the inner magnetosphere is important for simulations of the inner magnetosphere and a better understanding of its dynamics. Based on 17-year observations from both Cluster Ion Spectrometry and Research with Adaptive Particle Imaging Detector instruments onboard the Cluster mission, we used ma…
Astrophysical Studies of 9 Unstudied Open Star Clusters Using GAIA DR3
Tadross, A. L.; Badawy, W. A.; Hendy, Y. H. M. +2 more
Using the Gaia DR3 data sets, this work gives an analysis of nine open clusters: Dolidze 25, Kronberger 13, Kronberger 18, Majaess 99, NGC 7795, Ruprecht 139, Teutsch 55, S1, and FSR 0596, which are close to the Galactic plane of the Milky Way. The number of probable cluster members is found to be 81, 77, 120, 155, 108, 110, 160, and 116 respectiv…
SRG/ART-XC Galactic Plane Survey near Galactic Longitude L 20°: Catalog of Sources
Sazonov, S. Yu.; Lutovinov, A. A.; Karasev, D. I. +11 more
We present a catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope onboard the SRG space observatory during the observations of the Galactic plane region near a longitude l~20° (L20 field) in October 2019. The L20 field was observed four times in the scanning mode, which provided a uniform coverage of the sky region with a total ar…
Nustar observation of the binary system 4U 0114 + 65
Abdallah, Mohammed H.; Samir, Rasha M.; Leahy, Denis A. +1 more
The high-mass X-ray binary system 4U 0114 + 65 was observed by Nustar in October 2019 and by XMM-Newton in August 2015. Here we performed spectral and timing analysis of the Nustar observation and carry out timing analysis on the XMM-Newton data. We measured the spin period of the neutron star from both observations and found a spin-up rate $\dot{…
Searching For Wide Binary Stars with Non-coeval Components in the Southern Sky
Malkov, Oleg; Kniazev, Alexey
We have completed our observational program to search for wide binary systems with non-coeval components in the southern sky and report our results here. The final set of four systems was spectroscopically investigated in this paper. No binary systems with components of different ages were found among them. Taking into account our previous studies…
Chasing extreme planetary architectures. I. HD 196885 Ab, a super-Jupiter dancing with two stars?
Bouchy, F.; Kervella, P.; Udry, S. +21 more
Context. Planet(s) in binaries are unique architectures for testing predictions of planetary formation and evolution theories in very hostile environments. Their presence in such a highly perturbed region poses a clear challenge from the early phase of planetesimals accretion to the dynamical evolution and stability through a very long period of t…
Study of Forbush Decrease Recovery Times by the Payload for Antimatter Matter Exploration and Light-Nuclei Astrophysics (PAMELA) Experiment
Ricci, M.; Picozza, P.; Bazilevskaya, G. A. +37 more
A Forbush decrease (FD) is a sudden drop of cosmic-ray intensity arising as an effect of coronal mass ejection (CME) propagation in interplanetary space. The different physical properties of each CME cause variability in the FDs observed by scientific instruments. A comprehensive study of both phenomena is required to properly understand the proce…
Drift rates of major Neptunian features between 2018 and 2021
de Pater, Imke; Wong, Michael H.; Hueso, Ricardo +13 more
Using near-infrared observations of Neptune from the Keck and Lick Observatories, and the Hubble Space Telescope in combination with amateur datasets, we calculated the drift rates of prominent infrared-bright cloud features on Neptune between 2018 and 2021. These features had lifespans of ∼ 1 day to ≥1 month and were located at mid-latitudes and …
The Low-temperature Corona in ESO 511-G030 Revealed by NuSTAR and XMM-Newton
Fabian, Andrew C.; Reynolds, Christopher S.; Yu, Zhibo +9 more
We present the results from a coordinated XMM-Newton + NuSTAR observation of the Seyfert 1 galaxy ESO 511-G030. With this joint monitoring program, we conduct a detailed variability and spectral analysis. The source remained in a low flux and very stable state throughout the observation period, although there are slight fluctuations of flux over l…