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Investigating dynamical properties of globular clusters through a family of lowered isothermal models
Jiang, Ing-Guey; Cheng, Chia-Hsuan
To investigate the dynamical properties of globular clusters, surface brightness and kinematic data were collected and fitted to a family of lowered isothermal models called LIMEPY models. For the 18 globular clusters studied, the amounts of concentration, truncation, and anisotropy were determined. In addition, the cluster mass, half-mass radius,…
The formation of cone chains in the Chryse Planitia region on Mars and the thermodynamic aspects of this process
Czechowski, Leszek; Zalewska, Natalia; Zambrowska, Anita +3 more
This paper considers a small region in Chryse Planitia where several subparallel chains of cones are observed. Despite many papers on small Martian cones, the mechanism of their formation is not unequivocally explained, nor the reason for their arrangement in subparallel chains. In this paper, we test a few hypotheses stating that most of the cone…
Gaia DR3 and nearby galaxies: where do foregrounds matter?
Barmby, P.
Nearby galaxies provide populations of stellar and non-stellar sources at a common distance and in quantifiable environments. All are observed through the Milky Way foreground, with varying degrees of contamination that depend on observed Galactic latitude and the distance and size of the target galaxy. This work uses Gaia Data Release 3 (DR3) to …
A Machine Learning Enhanced Approach for Automated Sunquake Detection in Acoustic Emission Maps
Besliu-Ionescu, Diana; Mercea, Vanessa; Paraschiv, Alin Razvan +2 more
Sunquakes are seismic emissions visible on the solar surface, associated with some solar flares. Although discovered in 1998, they have only recently become a more commonly detected phenomenon. Despite the availability of several manual detection guidelines, to our knowledge, the astrophysical data produced for sunquakes is new to the field of mac…
A closer look at NGC 7314 nuclear region: a multiwavelength analysis of the Seyfert nucleus and its surroundings
Arévalo, P.; López-Navas, E.; Menezes, R. B. +4 more
The central regions of galaxies harbouring active galactic nuclei (AGNs) can be quite complex, especially at high activity, presenting, besides variability, a variety of phenomena related, e.g. to ionization/excitation mechanisms. A detailed study is necessary in order to understand better those objects. For that reason, we performed a multiwavele…
Investigating the vertical distribution of the disk as a function of radial action
Zhao, Gang; Chen, Yuqin; Du, Cuihua +1 more
Aims: As heating processes can broaden the distributions of radial actions and the vertical distributions of the Galactic disks, we investigate the vertical distribution of the Galactic disks as a function of radial action based on Apache Point Observatory Galactic Evolution Experiment (APOGEE) and Gaia data in order to deepen our understandi…
In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022
Ayres, Thomas
The Wilson-Bappu effect (WBE) is a remarkable correlation between the width of the chromospheric emission core of the Ca II 3934 Å K line and stellar absolute visual magnitude over an astonishing range, from diminutive red dwarfs to bloated yellow supergiants. The WBE signifies a deep connection between the nonclassical, mechanically heated chromo…
Small-Scale Upflows in a Coronal Hole - Tracked from the Photosphere to the Corona
Barczynski, Krzysztof; Orozco Suárez, David; Mandrini, Cristina H. +4 more
Coronal transients are known as sources of coronal upflows. With the commissioning of Solar Orbiter, it became apparent that coronal small-scale features are even more frequent than previously estimated. It was found that even small coronal features seen by Solar Orbiter can produce visible upflows. Therefore, it is important to study the plasma f…
Validation of TOI-1221 b: A Warm Sub-Neptune Exhibiting Transit Timing Variations around a Sun-like Star
Kristiansen, Martti H.; Torres, Guillermo; Hellier, Coel +25 more
We present a validation of a long-period ( ${91.68278}_{-0.00041}^{+0.00032}$ days) transiting sub-Neptune planet, TOI-1221 b (TIC 349095149.01), around a Sun-like (m V = 10.5) star. This is one of the few known exoplanets with a period >50 days, and belongs to the even smaller subset of which have bright enough hosts for detailed …
Are Nonthermal Velocities in Active Region Coronal Loops Anisotropic?
Hahn, Michael; Asgari-Targhi, Mahboubeh; Savin, Daniel Wolf
We have measured line widths in active region coronal loops in order to determine whether the nonthermal broadening is anisotropic with respect to the magnetic field direction. These nonthermal velocities are caused by unresolved fluid motions. Our analysis method combines spectroscopic data and a magnetic field extrapolation. We analyzed spectra …