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A search for thermal X-ray emission from the composite supernova remnant G21.5-0.9 with Suzaku
Raycheva, Nergis C.; Sezer, Aytap
G21.5-0.9 is a young plerionic composite supernova remnant (SNR) hosting a bright pulsar wind nebula. The previous X-ray studies reported that the X-ray spectrum of the entire SNR can be fitted with a non-thermal spectral model, while the recent Chandra studies have pointed out that its X-ray spectrum also shows weak thermal emission. With this mo…
Speckle Observations with PISCO in Calern (France): Orbit and Mass Determinations for 22 Visual Binaries
Bendjoya, P.; Rivet, J. -P.; Ling, J. F. +7 more
This paper presents orbits and masses for 22 visual double stars, partly derived using their last observations made with the speckle camera PISCO. For 13 of them we have determined their first-time orbits. Masses were calculated from Hipparcos and Gaia parallaxes when available, and from dynamical parallaxes otherwise. They are compared with masse…
KIC 10417986: Spectroscopic Confirmation of the Nature of the Binary System with a δ Scuti Component
Esamdin, Ali; Fu, Jian-Ning; Yang, Tao-Zhi +9 more
KIC 10417986 is a short orbital period (0.0737 day) ellipsoidal variable star with a δ Sct and γ Dor hybrid pulsation component discovered by Kepler. The ground-based spectroscopic observations were carried out in the winters of 2020 and 2021 to investigate the binary nature of this star. We derive the orbital parameters using the rvfit code with …
Search for shallow subsurface structures in Chryse and Acidalia Planitiae on Mars
Tsuchiya, Fuminori; Kimura, Tomoki; Kumamoto, Atsushi +6 more
Chryse and Acidalia Planitiae (CAP) are known as one of the areas which have abundant sites of recurring slope lineae (RSL) on Mars. We present a radar survey of shallow subsurface structures across the CAP regions using the Mars SHAllow RADar sounder (SHARAD) onboard the Mars Reconnaissance Orbiter (MRO). A total of 25 subsurface reflectors were …
New views in the ultraviolet of the Andromeda galaxy enabled by the AstroSAT/UVIT Telescope
Buick, Megan; Postma, Joseph E.; Leahy, Denis A. +2 more
The UVIT instrument on AstroSat has carried out a survey of our neighboring Andromeda galaxy, with a set of 19 fields to cover its large angular extent. The survey is complete in the FUV F148W filter, and about halfcomplete in FUV F169M, FUV F172M, NUV N219M and NUV N279N filters. The NUV coverage is incomplete due to failure of the NUV detector p…
Evaluating the feasibility of interpretable machine learning for globular cluster detection
Fahrion, Katja; Dold, Dominik
Extragalactic globular clusters (GCs) are important tracers of galaxy formation and evolution because their properties, luminosity functions, and radial distributions hold valuable information about the assembly history of their host galaxies. Obtaining GC catalogues from photometric data involves several steps which will likely become too time-co…
Hyades Kinematics and the Relationship Between Galactic Coordinates and its Angular Distance from the Apex with Gaia EDR3
Elsanhoury, W. H.; Al-Johani, Amnah S.; Al-Juhani, Afaf +6 more
In this paper, we have improved the Hyades members with aid of the Gaia EDR3 source. We have studied their kinematics, including computations of the convergent point with AD-diagram method such as \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathr…
Reflectance study of ice and Mars soil simulant associations-II. CO2 and H2O ice
Thomas, Nicolas; Pommerol, Antoine; Poch, Olivier +1 more
We measure the visible and near-infrared reflectance of icy analogues of the Martian surface made of CO2 ice associated in different ways with H2O ice and the regolith simulant JSC Mars-1. Such experimental results obtained with well-controlled samples in the laboratory are precious to interpret quantitatively the imaging and…
Precise Measurement of Orbital and Physical Parameters of Bright Detached Solar Analog Eclipsing Binaries
Çakırlı, Ö.; Kayhan, C.; Hoyman, B. +2 more
We combined photometry from the All Sky Automated Survey (ASAS) and the Transiting Exoplanet Survey Satellite (TESS) with high-resolution spectroscopy from the ESO public archive to obtain, for the first time, absolute physical and orbital parameters for six double-lined detached eclipsing binary systems with solar-type components. The atmospheric…
RXTE Observation of the Nonthermal Emission from the Early Stage Merger in A1750
Henriksen, Mark J.
We make the first observation-based calculation of the energy that goes into cosmic ray protons versus cosmic ray electrons in shock acceleration during structure formation. We find a ratio of energy in cosmic ray protons to energy in cosmic ray electrons of 0.86. This value, calculated from the nonthermal X-ray component reported here from RTXE a…