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The hierarchical structure of galactic haloes: generalized N-dimensional clustering with C LUSTAR-ND
Lewis, Geraint F.; Oliver, William H.; Elahi, Pascal J.
We present C LUSTAR-ND, a fast hierarchical galaxy/(sub)halo finder that produces Clustering Structure via Transformative Aggregation and Rejection in N-Dimensions. It is designed to improve upon H ALO-OPTICS - an algorithm that automatically detects and extracts significant astrophysical clusters from the 3D spatial positions of simulation partic…
Convolutional Neural Networks for Searching Superflares from Pixel-level Data of the Transiting Exoplanet Survey Satellite
Tu, Zuo-Lin; Wang, F. Y.; Wu, Qin +3 more
In this work, six convolutional neural networks (CNNs) have been trained based on 15,638 superflare candidates on solar-type stars, which are collected from the three years of Transiting Exoplanet Survey Satellite (TESS) observations. These networks are used to replace the manually visual inspection, which was a direct way of searching for superfl…
Illuminating the Motions of Jupiter's Auroral Dawn Storms
Nichols, J. D.; Rutala, M. J.; Clarke, J. T. +1 more
Jupiter's auroral main emission (ME) has long been considered to be the result of currents keeping plasma corotating with the surrounding magnetosphere. As a result, the ME corotates with the planet, and individual auroral features making up the ME roughly follow suit. Jupiter's dawn storms, some of the rarest and brightest auroral features within…
Photometric and statistical comparisons of the old open cluster M67 (NGC 2682) using KFISP and Gaia EDR3 astrometry
Hendy, Y. H. M.; Abdel Rahman, H. I.
Ulysses Flyby in the Heliosphere: Comparison of the Solar Wind Model with Observational Data
Malova, Helmi V.; Popov, Victor Yu.; Zelenyi, Lev M. +1 more
A model capable of reproducing a set of solar wind parameters along the virtual spacecraft orbit out of an ecliptic plane has been developed. In the framework of a quasi-stationary axisymmetric self-consistent MHD model the spatial distributions of magnetic field and plasma characteristics at distances from 20 to 1200 Solar radii at almost all sol…
The astrometric results of observations of fast-moving NEAs during close approach to the Earth
Yu, Yong; Tang, Zheng-Hong; Pomazan, Anton +4 more
Current investigation is devoted to ongoing follow-up observations of fast-moving near-Earth asteroids (NEAs) carried out with Rotating-drift-scan CCD technique on small-aperture telescopes in China and Ukraine. The observations were obtained during closest approach (CA) to the Earth in order to get more observational points and extend observation…
Various Activities above Sunspot Light Bridges in IRIS Observations: Classification and Comparison
Hou, Yijun; Li, Ting; Yang, Shuhong +3 more
Light bridges (LBs) are among the most striking substructures in sunspots, where various activities have been revealed by recent high-resolution observations from the Interface Region Imaging Spectrograph (IRIS). Based on the variety of their physical properties, we classified these activities into four distinct categories: transient brightening (…
A puzzling 2-hour X-ray periodicity in the 1.5-hour orbital period black widow PSR J1311−3430
Mereghetti, Sandro; Belfiore, Andrea; Salvaterra, Ruben +3 more
Time-domain analysis of an archival XMM-Newton observation unveiled a very unusual variability pattern in the soft X-ray emission of PSR J1311−3430, a black widow millisecond pulsar in a tight binary (PB = 93.8 min) with a very low-mass (M ∼ 0.01 M⊙) He companion star, known to show flaring emission in the optical and in the …
Differential astrometry with Gaia. Investigating relativistic light deflection close to Jupiter
Lattanzi, M. G.; Messineo, R.; Busonero, D. +5 more
Aims: In this paper, we develop a differential astrometric framework that is appropriate for a scanning space satellite such as Gaia. We apply it to the first of the GAREQ fields - the Gaia Relativistic Experiment on Jupiter's quadrupole - which is the fruit of dedicated efforts within the Gala project focused on measuring the relativistic de…
Spectral evidence of solar neighborhood analogs in CALIFA galaxies
Sánchez, S. F.; Barrera-Ballesteros, J. K.; Carigi, L. +3 more
Aims: We introduce a novel nonparametric method to find solar neighborhood analogs (SNAs) in extragalactic integral field spectroscopic surveys. The main ansatz is that the physical properties of the solar neighborhood (SN) should be encoded in its optical stellar spectrum.
Methods: We assume that our best estimate of such a spectrum is …