A VLBI Proper Motion Analysis of the Recoiling Supermassive Black Hole Candidate Mrk 1018 [PDF]
The Astrophysical Journal, 2023 Mrk 1018 is a nearby changing-look active galactic nucleus (AGN) that has oscillated between spectral Type 1.9 and Type 1 over a period of 40 yr. Recently, a recoiling supermassive black hole (rSMBH) scenario has been proposed to explain the spectral and
Gregory Walsh +2 more
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Precision analysis of NGC 2158 with Gaia DR3 [PDF]
Scientific ReportsThis research uses the third edition of the Gaia Data Release (DR3) to re-investigate the open star cluster NGC 2158. We employed the pyUPMASK Python package and HDBSCAN algorithms to identify the cluster member stars. The key focus of this investigation
Nasser M. Ahmed, A. L. Tadross
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The photometry and kinematics studies of NGC 2509 derived from Gaia DR3 [PDF]
Scientific ReportsThis research uses the third edition of the Gaia Data Release (DR3) to re-investigate the open star cluster NGC 2509. We employed the pyUPMASK Python package and HDBSCAN algorithms to identify the cluster member stars.
Nasser M. Ahmed, A. L. Tadross
doaj +2 more sources
Tidal tail identification and detailed analysis of the open star cluster King 13 using Gaia DR3 and 2MASS [PDF]
Scientific ReportsWe present a comprehensive study of the young open cluster King 13 using photometric and astrometric data from Gaia DR3 and 2MASS. Our analysis refines the cluster’s fundamental parameters, including its structure, kinematics, and evolutionary status. To
Nasser M. Ahmed, Mohamed S. Darwish
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Proper motion of Cygnus Loop shock filaments [PDF]
Serbian Astronomical Journal, 2023 We determined the shock speed in the Galactic supernova remnant Cygnus Loop, using the proper motion of its optical filaments and the latest estimate of its distance.
Vučetić M. +6 more
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Simulation of CSST’s astrometric capability
Frontiers in Astronomy and Space Sciences, 2023 Introduction: The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude
Zhen-Sen Fu +12 more
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Position and Proper Motion of Sagittarius A* in the ICRF3 Frame from VLBI Absolute Astrometry
The Astronomical Journal, 2023 Sagittarius A* (Sgr A*) is a strong, compact radio source believed to be powered by a supermassive black hole at the galactic center. Extinction by dust and gas in the galactic plane prevents observing it optically, but its position and proper motion ...
David Gordon +2 more
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Cannonball or Bowling Ball: Proper Motion and Parallax for PSR J0002+6216
The Astrophysical Journal, 2023 We report the results of careful astrometric measurements of the cannonball pulsar J0002+6216 carried out over 3 yr using the High Sensitivity Array. We significantly refine the proper motion to μ = 35.3 ± 0.6 mas yr ^−1 and place new constraints on the ...
S. Bruzewski +6 more
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Large-Scale Ejecta of Z CMa—Proper Motion Study and New Features Discovered
Galaxies, 2023 Z Canis Majoris is a fascinating early-type binary with a Herbig Be primary and a FU Orionis-type secondary. Both of the stars exhibit sub-arcsecond jet-like ejecta.
Tiina Liimets +4 more
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Motion Smoothness-Based Assessment of Surgical Expertise: The Importance of Selecting Proper Metrics
Sensors, 2023 The smooth movement of hand/surgical instruments is considered an indicator of skilled, coordinated surgical performance. Jerky surgical instrument movements or hand tremors can cause unwanted damages to the surgical site.
Farzad Aghazadeh +3 more
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