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Sequential Observations of Flux Transfer Events, Poleward-Moving Auroral Forms, and Polar Cap Patches
Russell, C. T.; Khotyaintsev, Y.; Fear, R. C. +17 more
We report the observation of solar wind-magnetosphere-ionosphere interactions using a series of flux transfer events (FTEs) observed by Magnetospheric MultiScale (MMS) mission located near the dayside magnetopause on 18 December 2017. The FTEs were observed to propagate duskward and either southward or slightly northward, as predicted under duskwa…
Outbursts of comets at large heliocentric distances: Concise review and numerical simulations of brightness jumps
Wesołowski, M.; Gronkowski, P.; Tralle, I.
The outburst of comet brightness is spectacular and well-known manifestation of the physical activity of these relatively small cosmic bodies. The outbursts of brightness are observed for periodic comets, as well as for the comets moving along parabolic trajectories. The most known comet representing such kind of activity is the comet 29P/Schwassm…
End-of-mission calibration of the Cassini Imaging Science Subsystem
Porco, Carolyn; West, Robert; Verbiscer, Anne +3 more
We provide an end-of-mission update to the in-flight calibration of the Imaging Science Subsystem cameras on the Cassini spacecraft, resolving discrepancies in our previous analyses from 2004 to 2010, incorporating data through the end of the mission, adding a correction for the weak but measurable camera sensitivity decline over time, and providi…
Investigating the Chromospheric Footpoints of the Solar Wind
De Pontieu, Bart; McIntosh, Scott W.; Brooks, David H. +1 more
Coronal holes present the source of the fast solar wind. However, the fast solar wind is not unimodal—there are discrete, but subtle, compositional, velocity, and density structures that differentiate different coronal holes as well as wind streams that originate within one coronal hole. In this Letter we exploit full-disk observational "mosaics" …
ALMA Observations of the Extraordinary Carina Pillars: HH 901/902
Ho, Paul T. P.; Mesa-Delgado, Adal; Toalá, Jesús A. +4 more
We present Atacama Large Millimeter/Submillimeter Array 1.3 mm continuum and C18O(2-1), N2D+(3-2), 13CS(5-4), and 12CO(2-1) line sensitive and high angular resolution (∼0"3) observations of the famous Carina pillars and protostellar objects HH 901/902. Our observations reveal for the first tim…
The Hα Emission Line Variations of HR 6819
Gies, Douglas R.; Wang, Luqian
The star system HR 6819 was recently proposed by Rivinius et al. as the site of the nearest example of a stellar-mass black hole. Their spectra show evidence of two components: a B3 III star in a 40 day orbit and a stationary B-emission line star. Based upon the orbital mass function and the lack of evidence of a spectral component with reflex orb…
Tracing the Coevolution Path of Supermassive Black Holes and Spheroids with AKARI-selected Ultraluminous IR Galaxies at Intermediate Redshifts
Yamamura, Issei; Toba, Yoshiki; Noda, Hirofumi +6 more
We present the stellar population and ionized-gas outflow properties of ultraluminous IR galaxies (ULIRGs) at z = 0.1-1.0 that are selected from the AKARI far-IR all-sky survey. We construct a catalog of 1077 ULIRGs to examine feedback effects after major mergers. Of the 1077 ULIRGs, 202 are spectroscopically identified by SDSS and Subaru/FOCAS ob…
NuSTAR and Parkes observations of the transitional millisecond pulsar binary XSS J12270-4859 in the rotation-powered state
de Martino, D.; Rea, N.; Torres, D. F. +5 more
We report on the first NuSTAR observation of the transitional millisecond pulsar binary XSS J12270-4859 during its current rotation-powered state, complemented with a 2.5 yr-long radio monitoring at Parkes telescope and archival XMM-Newton and Swift X-ray and optical data. The radio pulsar is mainly detected at 1.4 GHz displaying eclipses over ∼ 4…
The Relation of the Alpha Persei Star Cluster with the Nearby Stellar Stream
Carraro, Giovanni; Seleznev, Anton F.; Kulesh, Maxim V. +1 more
A map of 100° on a side extracted from Gaia DR2 and centered on Alpha Persei reveals two distinct structures—the Alpha Persei star cluster and a conspicuous stellar stream, as widely documented in recent literature. In this work we employ DBSCAN to assess individual stars' membership and attempt at separating stars belonging to the cluster and to …
Investigation of the Middle Corona with SWAP and a Data-Driven Non-Potential Coronal Magnetic Field Model
West, Matthew J.; Meyer, Karen A.; Upton, Lisa A. +2 more
The large field-of-view of the Sun Watcher using Active Pixel System detector and Image Processing (SWAP) instrument onboard the PRoject for Onboard Autonomy 2 (PROBA2) spacecraft provides a unique opportunity to study extended coronal structures observed in the EUV in conjunction with global coronal magnetic field simulations. A global non-potent…