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A nearby luminous AGN sample optically selected from Hubble Space Telescope
Li, Shuang-Liang
In this work, a nearby luminous active galactic nucleus (AGN) sample is selected from Hubble Space Telescope(HST), where only sources with both X-ray emission observed by Chandra/XMM-Newton and radio flux detected by Very Large Array (VLA)/Very Long Baseline Array (VLBA)/very long baseline interferometry (VLBI)/Multi-Element Radio Linked Interfero…
The Ursa Major Moving Group: a chronochemokinematic analysis
Sneden, C.; Dopcke, Gustavo; Porto de Mello, G. F.
Stars in kinematic groups are believed to share the same age, metallicity, and velocity vectors, and are disrupted by events such as encounters with massive objects, leaving a residue of stars sharing the same kinematic properties, thus bridging an important evolutionary gap between clusters and field stars. We determine the most likely metallicit…
Detection of a Low-mass Stellar Companion to the Accelerating A2IV Star HR 1645
Duchêne, Gaspard; Esposito, Thomas M.; Hom, Justin +51 more
The ∼500 Myr A2IV star HR 1645 has one of the most significant low-amplitude accelerations of nearby early-type stars measured from a comparison of the Hipparcos and Gaia astrometric catalogs. This signal is consistent with either a stellar companion with a moderate mass ratio (q ∼ 0.5) on a short period (P < 1 yr), or a substellar companion at…
Validation of MHD Model Predictions of the Corona with LASCO-C2 Polarized Brightness Images
Riley, Pete; Lamy, Philippe; Mikić, Zoran +1 more
Progress in our understanding of the solar corona requires that the results of advanced magnetohydrodynamic models driven by measured magnetic fields, and particularly the underlying heating models, be thoroughly compared with coronal observations. The comparison has so far mainly concerned the global morphology of the corona, synthetic images cal…
Multifilter time-series observations of three short period ATLAS variable stars
Koen, Chris
The `Asteroid Terrestrial-impact Last Alert System' discovered hundreds of thousands of new candidate variable stars. Follow-up observations of three of these are reported in this paper. The targets were selected on the basis of having high probability of being periodic (false alarm probability for period detection smaller than 10-5), s…
Machine Learning Analysis of Jupiter's Far-Ultraviolet Auroral Morphology
Milan, S. E.; Nichols, J. D.; Kamran, A.
We present the first principal component analysis of Jupiter's far-ultraviolet auroras, in order to identify the most repeatable sources of variation in the auroral morphology. We show that the most recurrent source of variance is emission just poleward of the statistical oval on the dawnside. Further significant repeatable sources of variance are…
Kinematics of subclusters in star cluster complexes: imprint of their parental molecular clouds
Fujii, M. S.
Star cluster complexes such as the Carina Nebula could have formed in turbulent giant molecular clouds. We perform a series of N-body simulations starting from subclustering initial conditions based on hydrodynamic simulations of turbulent molecular clouds. These simulations finally result in the formation of star cluster complexes consisting of s…
Non-thermal emission from massive star-forming regions: a possible SNR candidate G351.7-1.2?
Vig, S.; Ghosh, S. K.; Lal, D. V. +3 more
We present low-frequency wideband observations (300-500 MHz) of the star-forming complex G351.7-1.2 using upgraded Giant Metrewave Radio Telescope (uGMRT), India. Combining this with the optical, infrared, and submillimetre data, we analyse the large-scale diffuse radio emission associated with the region that exhibits a broken shell morphology. T…
Water and OH Emission from the Inner Disk of a Herbig Ae/Be Star
Najita, Joan R.; Brittain, Sean D.; Carr, John S. +2 more
We report the detection of hot H2O and OH emission from the Herbig Ae/Be star HD 101412 using the Cryogenic Infrared Echelle Spectrograph on the Very Large Telescope. Previous studies of Herbig Ae/Be stars have shown the presence of OH around some of these sources, but H2O has proven more elusive. While marginal water emissio…
Solar Wind Dynamic Pressure Upstream From Saturn: Estimation From Magnetosheath Properties and Comparison With SKR
Thomsen, M. F.; Jackman, C. M.; Lamy, L.
An analytical method is developed by which measurements made by the Cassini spacecraft in Saturn's magnetosheath can be used to infer the upstream solar wind parameters, specifically the solar wind speed (Vsw) and the dynamic pressure (Pd). The method is validated by comparing the results with other estimates of these parameters, includ…