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Role of magnetic fields in the fragmentation of the Taurus B213 filament into Sun-type star-forming cores
Jose, Jessy; Eswaraiah, Chakali; Jiao, Sihan +1 more
Fragmentation is a key step in the process of transforming clouds (and their substructures, such as filaments, clumps and cores) into protostars. The thermal gas pressure and gravitational collapse are believed to be the primary agents governing this process, referred as thermal Jeans fragmentation. However, the contributions of other factors (suc…
Solar Energetic Particle Events with Short and Long Onset Times
Yashiro, Seiji; Nitta, Nariaki V.; Asai, Ayumi +1 more
Gradual solar energetic particle (SEP) events, usually attributed to shock waves driven by coronal mass ejections (CMEs), show a wide variety of temporal behaviors. For example, TO, the >10 MeV proton onset time with respect to the launch of the CME, has a distribution of at least an order of magnitude, even when the source region is not far fr…
Periodic changes in the morphology of the Galactic resonance rings
Melnik, A. M.; Dambis, A. K.; Podzolkova, E. N.
We study the periodic enhancement of either trailing or leading segments of the resonance elliptical rings in the dynamical model of the Galaxy which reproduces distributions of observed velocities derived from Gaia DR3 (EDR3) data along the Galactocentric distance. The model disc forms a nuclear ring, an inner combined ring, and outer resonance r…
Diagnostics from Polarization of Scattered Optical Light from Galactic Infrared Cirrus
Martin, Peter G.; Bowes, Shannon K.
We propose polarization of scattered optical light from intermediate Galactic latitude infrared cirrus as a new diagnostic to constrain models of interstellar dust and the anisotropic interstellar radiation field (aISRF). For single scattering by a sphere, with Mie scattering phase functions for intensity and polarized intensity for a dust model a…
Physics and Chemistry of Radiation Driven Cloud Evolution. [C II] Kinematics of IC 59, and IC 63
Soam, Archana; Andersson, B. -G.; Güsten, Rolf +5 more
We used high-resolution [C II] 158 µm mapping of two nebulae IC 59 and IC 63 from SOFIA/upGREAT in conjunction with ancillary data of the gas, dust, and polarization to probe the kinematics, structure, and magnetic properties of their photodissociation regions (PDRs). The nebulae are part of the Sh 2-185 H II region that is illuminated by th…
Surface activity of rapidly rotating stars from simultaneous X-ray and UV observations with AstroSat
Sairam, Lalitha; Pathak, Utkarsh; Singh, Kulinder Pal
Our study focuses on analysing the coronal, transition and chromospheric activity of four rapidly rotating stars located within 50 pc in the solar neighborhood. We have used the multi-wavelength capabilities of AstroSat to investigate the outer atmospheres of AB Dor, BO Mic, DG CVn and GJ 3331. These stars, classified as M and K type active stars,…
Solar Wind Protons in the Diamagnetic Cavity at Comet 67P/Churyumov-Gerasimenko
Nilsson, Hans; Goetz, Charlotte; Volwerk, Martin +5 more
The plasma environment at a comet can be divided into different regions with distinct plasma characteristics. Two such regions are the solar wind ion cavity, which refers to the part of the outer coma that does not contain any solar wind ions anymore; and the diamagnetic cavity, which is the region of unmagnetized plasma in the innermost coma. Fro…
The clustering properties of high-redshift passive galaxies
Pentericci, L.; Magliocchetti, M.; Santini, P. +1 more
We investigate the clustering properties of 3 < z < 5 candidate passive galaxies from the Merlin et al. (2019) sample residing in the GOODS-North (35 sources) and GOODS-South (33 sources) fields. Within the large uncertainties due to the paucity of sources we do not detect clustering signal in GOODS-North, while this is present in GOODS-Sout…
Electric fields and currents in solar-terrestrial plasmas
Yang, Zhongwei; Parks, George K.; Lee, Ensang
This article will review many ideas and concepts originally suggested by Alfvén (Space Sci Rev 7:1940, 1967) and Fälthammar (Rev Geophys 15: 457, 1977) on the important roles electric fields and currents play in solar-terrestrial plasmas. Much of our understanding of planetary and solar plasmas has come primarily from treating plasmas as fluids. F…
Correlations in Chromospheric and Coronal Activity Indicators of Giant Stars
Crandall, Sara; Smith, Graeme H.
The main goal of this paper is to use ultraviolet photometry from the Galaxy Evolution Explorer (GALEX) satellite to study chromospheric activity among red giant and core-helium-burning (CHeB) stars. Correlations are sought between several chromospheric and coronal activity indicators for giants that were detected in soft X-rays by the ROentgen SA…