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Dynamical Evolution of Four Old Galactic Open Clusters Traced by Their Constituent Stars with Gaia DR3
Vaidya, Kaushar; Rao, Khushboo K.; Agarwal, Manan +2 more
We investigate the evolutionary stages of four open clusters—Berkeley 39, Collinder 261, NGC 6819, and NGC 7789—of ages ranging from 1.6 to 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age groups based on the segregation level of BSS with respect to red-giant-branch stars and main-sequence stars, re…
Investigating scaling relations in X-ray reverberating AGN using symbolic regression
Chainakun, P.; Young, A. J.; Thongkonsing, P. +1 more
Symbolic regression (SR) is a regression analysis based on genetic algorithms to search for mathematical expressions that best fit a given data set, by allowing the expressions themselves to mutate. We use the SR to analyse the parameter relations of the X-ray reverberating active galactic nuclei where the soft Fe-L lags were observed by the X-ray…
4U 1210-64: a new member of the rare intermediate-mass X-ray binary subclass
Montesinos, B.; McBride, V. A.; Pottschmidt, K. +5 more
4U 1210-64 is a peculiar X-ray binary that was first discovered in 1978 by the Uhuru satellite. The analysis of the X-ray data revealed a 6.7-d orbital period and an additional long-term modulation that is manifested as low- and high-flux states. Based on the previous classification of the donor star from the analysis of its optical spectra, the s…
The Relative Prevalence of Wave Packets and Coherent Structures in the Inertial and Kinetic Ranges of Turbulence as Seen by Solar Orbiter
Dudok de Wit, Thierry; Bendt, Alina; Chapman, Sandra
The Solar Orbiter (SO) mission provides the opportunity to study the evolution of solar wind turbulence. We use SO observations of nine extended intervals of homogeneous turbulence to determine when turbulent magnetic field fluctuations may be characterized as: (i) wave packets and (ii) coherent structures (CSs). We perform the first systematic sc…
Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope
Peng, Qing-Yu; Xu, Huan; Cheng, Xiang-Ming +3 more
This study details an astrometric observation campaign of the Near-Earth Asteroid 1998 HH49, conducted with the aim of refining our understanding of its physical characteristics. Utilizing the 50 cm telescope located at the Wumingshan Mountain in Daocheng, Sichuan, images were obtained over four nights, from 2023 October 19 to October 22. These ob…
AT 2021hdr: A candidate tidal disruption of a gas cloud by a binary super massive black hole system
Bauer, F. E.; Chavushyan, V.; Arévalo, P. +25 more
With a growing number of facilities able to monitor the entire sky and produce light curves with a cadence of days, in recent years there has been an increased rate of detection of sources whose variability deviates from standard behavior, revealing a variety of exotic nuclear transients. The aim of the present study is to disentangle the nature o…
JWST Reveals Bulge-dominated Star-forming Galaxies at Cosmic Noon
van Dokkum, Pieter; van der Wel, Arjen; Bezanson, Rachel +10 more
Hubble Space Telescope imaging shows that most star-forming galaxies at cosmic noon—the peak of cosmic star formation history—appear disk-dominated, leaving the origin of the dense cores in their quiescent descendants unclear. With the James Webb Space Telescope's high-resolution imaging to 5 µm, we can now map the rest-frame near-infrared e…
The Correlation Between Dust and Gas Contents in Molecular Clouds
Li, Guang-Xing; Chen, Bing-Qiu; Li, Rui-Zhi +3 more
Molecular clouds are regions of dense gas and dust in space where new stars and planets are born. There is a strong correlation between the distribution of dust and molecular gas in molecular clouds. The present work focuses on the three-dimensional morphological comparisons between dust and gas in 567 molecular clouds identified in a previously p…
Distribution of atmospheric aerosols during the 2007 Mars dust storm (MY 28): Solar infrared occultation observations by SPICAM
Montmessin, F.; Bertaux, J. -L.; Fedorova, A. A. +3 more
Solar occultation measurements by the SPICAM IR on Mars-Express have been used to study aerosol vertical distribution during the 2007 global dust storm (GDS) of Mars Year 28. Measurements in the near-IR spectral range from 1 to 1.7 µm provide information about aerosol optical properties, extinction coefficient, particle size and number densi…
2FHL J1745.1–3035: A Newly Discovered, Powerful Pulsar Wind Nebula Candidate
Vignali, C.; Ajello, M.; Tibaldo, L. +8 more
We present a multi-epoch, multi-observatory X-ray analysis for 2FHL J1745.1–3035, a newly discovered very high-energy Galactic source detected by the Fermi Large Area Telescope (LAT) located in close proximity to the Galactic Center (l = 358.°5319; b = ‑0.°7760). The source shows a very hard γ-ray photon index above 50 GeV, Γ γ = 1.2 ±…