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Organic Matter in Cometary Environments
McKay, Adam J.; Roth, Nathan X.
Comets contain primitive material leftover from the formation of the Solar System, making studies of their composition important for understanding the formation of volatile material in the early Solar System. This includes organic molecules, which, for the purpose of this review, we define as compounds with C–H and/or C–C bonds. In this review, we…
The evolution of merger fraction of galaxies at z < 0.6 depending on the star formation mode in the AKARI NEP-Wide Field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +19 more
We study the galaxy merger fraction and its dependence on star formation mode in the 5.4 deg2 of the North Ecliptic Pole-Wide Field. We select 6352 galaxies with AKARI 9 $\mu$m detections, and identify mergers among them using the Gini coefficient and M20 derived from the Subaru/Hyper Suprime-Cam (HSC) optical images. We obta…
Solo dwarfs IV: comparing and contrasting satellite and isolated dwarf galaxies in the Local Group
McConnachie, A. W.; Higgs, C. R.
We compare and contrast the stellar structures of isolated Local Group dwarf galaxies, as traced by their oldest stellar populations, with the satellite dwarf galaxies of the Milky Way and M 31. All Local Group dwarfs with Mv ≤ -6 and µo < 26.5 mag arcsec-2 are considered, taking advantage of measurements …
The Dynamics of the Alfvénic Oval
Keiling, Andreas
The auroral oval is a well-established concept, introduced more than five decades ago. The Alfvénic oval, on the other hand, is a very recent concept, which has been revealed in both observational and numerical studies. This is the first review of the global Alfvénic oval, while also defining primary, secondary and tertiary layers of the Alfvénic …
The CH radical at radio wavelengths: revisiting emission in the 3.3 GHz ground-state lines
Menten, Karl M.; Jacob, Arshia M.; Wiesemeyer, Helmut +1 more
Context. The intensities of the three widely observed radio-wavelength hyperfine structure (HFS) lines between the Λ-doublet components of the rotational ground state of CH are inconsistent with local thermodynamic equilibrium (LTE) and indicate ubiquitous population inversion. While this can be qualitatively understood assuming a pumping cycle th…
Multiwavelength Emission from Magnetically Arrested Disks around Isolated Black Holes
Kimura, Shigeo S.; Kashiyama, Kazumi; Hotokezaka, Kenta
We discuss the prospects for identifying the nearest isolated black holes (IBHs) in our Galaxy. IBHs accreting gas from the interstellar medium likely form magnetically arrested disks (MADs). We show that thermal electrons in the MADs emit optical signals through the thermal synchrotron process while nonthermal electrons accelerated via magnetic r…
The Mie representation for Mercury's magnetic field
Glassmeier, K. -H.; Narita, Y.; Motschmann, U. +4 more
The parameterization of the magnetospheric field contribution, generated by currents flowing in the magnetosphere is of major importance for the analysis of Mercury's internal magnetic field. Using a combination of the Gauss and the Mie representation (toroidal–poloidal decomposition) for the parameterization of the magnetic field enables the anal…
Integrated Photometry of Multiple Stellar Populations in Globular Clusters
Milone, A. P.; Cordoni, G.; Marino, A. F. +8 more
Evidence that multiple populations (MPs) are common properties of globular clusters (GCs) has accumulated over the past decades from clusters in the Milky Way and in its satellites. This finding has revived research into GCs, and suggested that their formation at high redshift must have been a much more complex phenomenon than imagined before. How…
Exploring the Stellar Rotation of Early-type Stars in the LAMOST Medium-resolution Survey. II. Statistics
Deng, Licai; de Grijs, Richard; Sun, Weijia +1 more
Angular momentum is a key property regulating star formation and evolution. However, the physics driving the distribution of the stellar rotation rates of early-type main-sequence stars is as yet poorly understood. Using our catalog of 40,034 early-type stars with homogeneous $v\sin i$ parameters, we review the statistical properties of their stel…
Estimating [α/Fe] from Gaia low-resolution BP/RP spectra using the ExtraTrees algorithm
Fouesneau, Morgan; Andrae, René; Korn, Andreas J. +2 more
Context. Gaia Data Release 3 will contain more than a billion sources with positions, parallaxes, and proper motions. In addition, for hundreds of millions of stars, it will include low-resolution blue photometer (BP) and red photometer (RP) spectra. Obtained by dispersing light with prisms, these spectra have resolutions that are too low to allow…