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Planar Magnetic Structures Downstream of Coronal Mass Ejection-driven Shocks in the Inner Heliosphere
Xu, Qi; Feng, Xueshang; Shen, Zhenning +7 more
Planar magnetic structures (PMSs), characterized by interplanetary magnetic field vectors remaining parallel to a specific plane, are commonly observed in the solar wind, especially in the sheath region of interplanetary coronal mass ejections (ICMEs). In this study, PMS events in the 2 hr regions downstream of ICME-driven shocks were investigated…
Ion Energization and Thermalization in Magnetic Reconnection Exhaust Region in the Solar Wind
Verscharen, Daniel; He, Jiansen; Fedorov, Andrey +7 more
Plasma energization and thermalization in magnetic reconnection is an important topic in astrophysical studies. We select two magnetic reconnection exhausts encountered by Solar Orbiter and analyze the associated ion heating in the kinetic regime. Both cases feature asymmetric plasma merging in the exhaust and anisotropic heating. For a quantitati…
Photospheric and Chromospheric Magnetic Field Evolution during the X1.6 Flare in Active Region NOAA 12192
Guglielmino, S. L.; Romano, P.; Zuccarello, F. +2 more
We report on observations acquired by the Interferometric Bidimensional Spectropolarimeter (IBIS) during SOL2014-10-22T14:02, an X1.6 flare that occurred in active region NOAA 12192, taken in the Fe I 617.30 nm and Ca II 854.2 nm line profiles. We analyze polarization signatures in the Stokes profiles of the two lines across one of the flare ribbo…
Are Quasi-periodic Pulsations Independent of Loop Oscillations in Solar Flare?
Li, Dong; Feng, Song; Ning, Zongjun +3 more
We investigated oscillations in an M8.7 solar flare (SOL2014-10-22), including quasi-periodic pulsations (QPPs) in light curves and Doppler shift oscillations in the flare loops. Using Bayesian-based Markov Chain Monte Carlo, Fast Fourier Transform, and wavelet analysis method, QPPs were identified at microwave and hard X-ray wave bands during the…
HST UV Spectroscopy of the Dwarf Starburst Galaxy Pox 186
Cannon, John M.; Skillman, Evan D.; Mehta, Vihang +4 more
Studying the galaxies responsible for reionization is often conducted through local reionization-era analogs; however, many of these local analogs are too massive to be representative of the low-mass star-forming galaxies that are thought to play a dominant role in reionization. The local, low-mass dwarf starburst galaxy Pox 186 is one such system…
Flares, Warps, Truncations, and Satellite: The Ultra-thin Galaxy UGC 11859
Beckman, John E.; Borlaff, Alejandro S.; Fanelli, Michael N. +2 more
The structure of the outskirts of galaxies provides valuable information about their past and evolution. Due to their projected orientation, edge-on isolated galaxies effectively serve as test labs in which to study the three-dimensional structures of galaxies, including warps and flares, and to explore the possible sources of such distortions. We…
The Neon Gap: Probing Ionization with Dwarf Galaxies at z 1
Koo, David C.; Guo, Yicheng; Guhathakurta, Puragra +2 more
We present measurements of [NeIII]λ3869 emission in z ~ 1 low-mass galaxies taken from the Keck/DEIMOS spectroscopic surveys HALO7D and DEEPwinds. We identify 167 individual galaxies with significant [NeIII] emission lines, including 112 "dwarf" galaxies with $\mathrm{log}({M}_{\star }/{M}_{\odot })\lt \,9.5$ , with 0.3 < z < 1.4. We also me…
HOPS 361-C's Jet Decelerating and Precessing through NGC 2071 IR
Quillen, Alice C.; Rubinstein, Adam E.; Federman, Samuel +5 more
We present a two-epoch Hubble Space Telescope study of NGC 2071 IR highlighting HOPS 361-C, a protostar producing an arced 0.2 parsec-scale jet. The proper motions for the brightest knots decrease from 350 to 100 km s-1 with increasing distance from the source. The [Fe II] and Paβ emission line intensity ratio gives a velocity jump thro…
Structure and Kinematics of Sh2-138-A Distant Hub-filament System in the Outer Galactic Plane
Baug, Tapas; Dewangan, Lokesh K.; Mallick, Kshitiz K. +2 more
We present a molecular line study of the Sh2-138 (IRAS 22308+5812) hub-filament system with the aim of investigating its structure and kinematics. Archival CO molecular line data from the Canadian Galactic Plane Survey (CO(J = 1-0)) for the wider region (~50' × 50') and the James Clerk Maxwell Telescope (CO(3-2), 13CO(3-2), and C18…
The Type II-P Supernova 2019mhm and Constraints on its Progenitor System
Rest, A.; Foley, R. J.; Kilpatrick, C. D. +4 more
We present pre- and postexplosion observations of the Type II-P supernova (SN II-P) 2019mhm located in NGC 6753. Based on optical spectroscopy and photometry, we show that SN 2019mhm exhibits broad lines of hydrogen with a velocity of -8500 ± 200 km s-1 and a 111 ± 2 day extended plateau in its luminosity, typical of the Type II-P subcl…