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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…
Possible Origin of a Newly Discovered GeV Gamma-Ray Source Fermi J1242.5+3236
Mo, Xiu-Rong; Luo, Ming-Hong; Tan, Hong-Bin +2 more
Based on the first 13.4 yr of Fermi science data in the energy range from 300 MeV to 500 GeV, we discovered a bright GeV gamma-ray source with a ~5.64σ detection, named Fermi J1242.5+3236, which has an offset of about 0.°0996 from a nearby star-forming galaxy NGC 4631. When using the 12 yr' data, the detection significance of Fermi J1242.5+3236 is…
Time-resolved spectral catalogue of INTEGRAL/SPI gamma-ray bursts
Greiner, Jochen; Biltzinger, Björn; Burgess, J. Michael
Since its launch in 2002, the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) satellite has detected many gamma-ray bursts (GRBs), which are summarised in the INTEGRAL Burst Alert System (IBAS) catalogue. This catalogue combines triggers from the data of the Imager on Board the INTEGRAL (IBIS) and of the anti-coincident shield (ACS) of …
Relating peak optical luminosity and orbital period of stellar-mass black holes in X-ray binaries
Maccarone, Thomas J.; Blackmon, Victoria A.
We compare the peak optical luminosity with the orbital period for a sample of 22 stellar-mass black hole candidates with good measurements of both quantities. We find that the peak absolute magnitude for the outbursts follows a linear relation with MV, peak = 3.48(± 0.85) - 3.89(± 0.91) logPorb, which corresponds to a $L_V \…