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The Initiation of a Solar Streamer Blowout Coronal Mass Ejection Arising from the Streamer Flank
Chen, Yao; Zheng, Ruisheng; Wang, Bing
Streamer blowout (SBO) coronal mass ejections (CMEs) represent a particular class of CMEs that are characterized by a gradual swelling of the overlying streamer and a slow CME containing a flux-rope structure. SBO CMEs arising from the streamer flank fall into a special category of SBO CMEs involving three lower arches under the higher streamer ar…
A NICER View of Spectral and Profile Evolution for Three X-Ray-emitting Millisecond Pulsars
Enoto, Teruaki; Bogdanov, Slavko; Ray, Paul S. +17 more
We present two years of Neutron star Interior Composition Explorer (NICER) X-ray observations of three energetic rotation-powered millisecond pulsars (MSPs): PSRs B1937+21, B1821-24, and J0218+4232. We fit Gaussians and Lorentzians to the pulse profiles for different energy sub-bands of the soft X-ray regime to measure the energy dependence of pul…
The Relaxation of Reconnected Open Magnetic Field Lines in the Earth's Magnetosphere
Xu, Qi; Xu, Xiaojun; Wang, Jing +3 more
Magnetic reconnection is a fundamental and important physical process that can release magnetic energy and change magnetic topology. A statistic study of reconnected magnetic field lines has been carried out by Cluster spacecraft 1 during 58 current sheet crossing events. We calculated the values of $| {B}_{n}/B| $ at different distances from reco…
Ultradense Gas at the Dusty Torus Scale in a Partially Obscured Quasar
Li, Zhenzhen; Zhou, Hongyan; Hao, Lei +5 more
We present detailed studies of the partially obscured quasar 2MASS J151653.23+190048.2 with continuous broadband spectrophotometry from near-infrared (NIR) through optical to ultraviolet (UV). The NIR and optical spectra show strong broad emission lines, while the UV spectrum is dominated by a set of rich intermediate-width emission lines (IELs). …
Role of the Coronal Environment in the Formation of Four Shocks Observed without Coronal Mass Ejections at Earth's Lagrangian Point L1
Pick, M.; Magdalenić, J.; Bocchialini, K. +3 more
The main goal of this study is to determine the solar origin of four single shocks observed at the Lagrange point L1 and followed by storm sudden commencements (SSCs) during 2002. We look for associated coronal mass ejections (CMEs), starting from estimates of the transit time from Sun to Earth. For each CME, we investigate its association with a …
Broadband X-Ray Observation of Broad-line Radio Galaxy 3C 109
Fabian, Andrew C.; Kara, Erin; Lohfink, Anne M. +1 more
We present a study of the central engine in the broad-line radio galaxy 3C 109. To investigate the immediate surrounding of this accreting, supermassive black hole, we perform a multiepoch broadband spectral analysis of a joint NuSTAR/XMM observation (2017), an archival XMM observation (2005) and the 105 month averaged Swift-BAT data. We are able …
Long-term Periodicities in Kepler Photometry of Open Cluster NGC 6811
Saar, S. H.; Velloso, E. N.; do Nascimento, J. -D., Jr.
Long-term photometric variability can sometimes be related to the emergence of starspots in the photosphere following a quasi-periodic magnetic activity cycle. In order to investigate the existence and properties of magnetic cycles in a narrow range of fundamental parameters, we focused on solar-type stars in the intermediate-age open cluster NGC …
Absorption-line Abundances in the SMC-like Galaxy UGC 5282: Evidence of ISM Dilution from Inflows on Kiloparsec Scales
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +4 more
We present a Hubble Space Telescope Cosmic Origins Spectrograph spectrum of the QSO SDSS J095109.12+330745.8 ( ${z}_{\mathrm{em}}=0.645$ ) whose sightline passes through the SMC-like dwarf galaxy UGC 5282 ( ${M}_{B}=-16.0$ , cz = 1577 km s-1), 1.2 kpc in projection from the central H II region of the galaxy. Damped Lyα (DLA) absorption …
A Binary Star in the Superbubble N160 in the Large Magellanic Cloud
Chu, You-Hua; Li, Chuan-Jui; Ishioka, Ryoko +2 more
We have made a spectroscopic investigation of the nature of 053949.17-693747.4, a blue star with mid-infrared excess, projected within a superbubble in the H II complex N160 in the Large Magellanic Cloud (LMC). Analyses of photometric and spectrophotometric data of this star indicate that it is an O7 ± 1 V in the LMC. The radial velocity of this s…
On the Relation between Diffuse Bands and Other Interstellar Features
Krełowski, J.; Galazutdinov, G. A.; Siebenmorgen, R.
We discuss possible relations between different constituents of interstellar clouds, such as gas atoms (Fe I), simple molecular species (CH, CN), and the carriers of the puzzling diffuse interstellar bands (DIBs 5780, 5797, 5850 Å) as well as dust grains. We exemplify that abundances of carriers of these spectral features, revealed by the Doppler …