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Contribution of Anisotropic Electron Current to the Magnetotail Current Sheet as a Function of Location and Plasma Conditions
Petrukovich, A. A.; Russell, C. T.; Artemyev, A. V. +7 more
The magnetotail current sheet carries the current responsible for the largest fraction of the energy storage in the magnetotail, the magnetic energy in the lobes. It is thus inextricably linked with the dynamics and evolution of many magnetospheric phenomena, such as substorms. The magnetotail current sheet structure and stability depend mostly on…
A kpc-scale-resolved study of unobscured and obscured star formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS
Ivison, R. J.; Smail, Ian; Sobral, David +12 more
We present Atacama Large Millimeter/Submillimeter Array (ALMA) continuum observations of a sample of nine star-forming galaxies at redshifts 1.47 and 2.23 selected from the High-z Emission Line Survey (HiZELS). Four galaxies in our sample are detected at high significance by ALMA at a resolution of 0 ${_{.}^{\prime\prime}}$ 25 at rest-frame 355 &m…
Detection of a variable ultrafast outflow in the narrow-line Seyfert 1 galaxy PG 1448+273
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +4 more
Relativistically blueshifted absorption features of highly ionized ions, the so-called ultrafast outflows (UFOs), have been detected in the X-ray spectra of a number of accreting supermassive black holes. If these features truly originate from accretion disc winds accelerated to more than 10 per cent of the speed of light, their energy budget is v…
Implications of a proton blazar inspired model on correlated observations of neutrinos with gamma-ray flaring blazars
Bhadra, Arunava; Majumdar, Debasish; Banik, Prabir +1 more
The recent detections of the neutrino event IceCube-170922A, 13 muon-neutrino events observed in 2014-2015 and the IceCube-141209A by IceCube observatory from the Blazars TXS 0506 +056 , PKS 0502 +049 /TXS 0506 +056 , and GB6 J1040+0617 respectively, all of which were in the state of enhanced gamma-ray emission, indicate that cosmic rays are accel…
Three open clusters containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55
Castro, N.; Negueruela, I.; Tabernero, H. M. +2 more
Classical Cepheids in open clusters play an important role in benchmarking stellar evolution models, in addition to anchoring the cosmic distance scale and invariably securing the Hubble constant. Three pertinent clusters hosting classical Cepheids and red (super)giants are: NGC 6649, NGC 6664, and Berkeley 55. These clusters form the basis of ana…
Color and aerosol changes in Jupiter after a North Temperate Belt disturbance
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Irwin, P. G. J. +5 more
The banded appearance of Jupiter's atmosphere shows significant changes over time, sometimes even transforming the reflectivity of a whole latitudinal band in a few weeks, and staying for years with an aspect different from the usual one. The origin of some of these disturbances may be associated with the creation and destruction of the chromophor…
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. IV. The Largest Broad Absorption Line Acceleration
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
We present an analysis of the broad absorption line (BAL) velocity shift that appeared in one of the outflow systems in quasar SDSS J1042+1646. Observations were taken by the Hubble Space Telescope/Cosmic Origins Spectrograph in 2011 and 2017 in the 500-1050 Å rest frame. The outflow's velocity centroid shifted by ∼-1550 km s-1 from -19…
Thermal and non-thermal X-ray emission from stellar clusters and superbubbles
Kavanagh, Patrick J.
Massive stellar clusters inject significant mass and energy into their surroundings driving superbubbles, 100–1000 pc diameter shells of swept-up interstellar material that contain a hot (
Distribution of physical parameters for 380 contact binaries in the Kepler field
Zhu, Li-Ying; Liu, Liang; Li, Xu-Zhi
We present the physical parameters (p, T, q, i, f) of 380 Kepler contact binary systems (hereafter called CBs). A statistical study on the CBs is carried out based on a Kepler photometric database. Our samples were selected from the Kepler Eclipsing Binary Catalogue of EW-type eclipsing binaries with periods around 0.2-1 d and amplitudes greater t…
Quiet-Sun hydrogen Lyman-α line profile derived from SOHO/SUMER solar-disk observations
Heinzel, P.; Gunár, S.; Schwartz, P. +1 more
Context. The solar radiation in the Lyman-α spectral line of hydrogen plays a significant role in the illumination of chromospheric and coronal structures, such as prominences, spicules, chromospheric fibrils, cores of coronal mass ejections, and solar wind. Moreover, it is important for the investigation of the heliosphere, Earth's ionosphere, an…