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The magnetic field and dust filaments in the Polaris Flare
Panopoulou, G. V.; Tassis, K.; Psaradaki, I.
In diffuse molecular clouds, possible precursors of star-forming clouds, the effect of the magnetic field is unclear. In this work, we compare the orientations of filamentary structures in the Polaris Flare, as seen through dust emission by Herschel, to the plane-of-the-sky magnetic field orientation (Bpos) as revealed by stellar optica…
Large-scale Structure around a z=2.1 Cluster
Casey, Caitlin M.; Kacprzak, Glenn G.; Tran, Kim-Vy H. +10 more
The most prodigious starburst galaxies are absent in massive galaxy clusters today, but their connection with large-scale environments is less clear at z≳ 2. We present a search of large-scale structure around a galaxy cluster core at z = 2.095 using a set of spectroscopically confirmed galaxies. We find that both color-selected star-forming galax…
Plasma code for astrophysical charge exchange emission at X-ray wavelengths
Raassen, A. J. J.; Gu, Liyi; Kaastra, Jelle
Charge exchange X-ray emission provides unique insight into the interactions between cold and hot astrophysical plasmas. Besides its own profound science, this emission is also technically crucial to all observations in the X-ray band, since charge exchange with the solar wind often contributes a significant foreground component that contaminates …
The JCMT Gould Belt Survey: Evidence for Dust Grain Evolution in Perseus Star-forming Clumps
White, G. J.; Di Francesco, J.; Marsh, K. +56 more
The dust emissivity spectral index, β, is a critical parameter for deriving the mass and temperature of star-forming structures and, consequently, their gravitational stability. The β value is dependent on various dust grain properties, such as size, porosity, and surface composition, and is expected to vary as dust grains evolve. Here we present …
The Electron Drift Instrument for MMS
Nakamura, R.; Baumjohann, W.; Torbert, R. B. +21 more
The Electron Drift Instrument (EDI) on the Magnetospheric Multiscale (MMS) mission measures the in-situ electric and magnetic fields using the drift of a weak beam of test electrons that, when emitted in certain directions, return to the spacecraft after one or more gyrations. This drift is related to the electric field and, to a lesser extent, th…
Spatially resolved galactic wind in lensed galaxy RCSGA 032727-132609
Rigby, Jane R.; Sharon, Keren; Bayliss, Matthew B. +4 more
We probe the spatial distribution of outflowing gas along four lines of sight separated by up to 6 kpc in a gravitationally lensed star-forming galaxy at z = 1.70. Using Mg II and Fe II emission and absorption as tracers, we find that the clumps of star formation are driving galactic outflows with velocities of -170 to -250 km s-1. The …
Homologous Jet-driven Coronal Mass Ejections from Solar Active Region 12192
Panesar, Navdeep K.; Moore, Ronald L.; Sterling, Alphonse C.
We report observations of homologous coronal jets and their coronal mass ejections (CMEs) observed by instruments onboard the Solar Dynamics Observatory (SDO) and the Solar and Heliospheric Observatory (SOHO) spacecraft. The homologous jets originated from a location with emerging and canceling magnetic field at the southeastern edge of the giant …
The MOSDEF Survey: The Strong Agreement between Hα and UV-to-FIR Star Formation Rates for z ~ 2 Star-forming Galaxies
Barro, Guillermo; Inami, Hanae; Siana, Brian +12 more
We present the first direct comparison between Balmer line and panchromatic spectral energy distribution (SED)-based star formation rates (SFRs) for z∼ 2 galaxies. For this comparison, we used 17 star-forming galaxies selected from the MOSFIRE Deep Evolution Field (MOSDEF) survey, with 3σ detections for Hα and at least two IR bands (Spitzer/MIPS 2…
Ultraluminous X-ray bursts in two ultracompact companions to nearby elliptical galaxies
Romanowsky, Aaron J.; Liu, Jifeng; Strader, Jay +8 more
A flaring X-ray source was found near the galaxy NGC 4697 (ref. 1). Two brief flares were seen, separated by four years. During each flare, the flux increased by a factor of 90 on a timescale of about one minute. There is no associated optical source at the position of the flares, but if the source was at the distance of NGC 4697, then the luminos…
Hall effect control of magnetotail dawn-dusk asymmetry: A three-dimensional global hybrid simulation
Artemyev, A. V.; Pritchett, P. L.; Wang, X. Y. +4 more
Magnetotail reconnection and related phenomena (e.g., flux ropes, dipolarizing flux bundles, flow bursts, and particle injections) occur more frequently on the duskside than on the dawnside. Because this asymmetry can directly result in dawn-dusk asymmetric space weather effects, uncovering its physical origin is important for better understanding…