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G 112-43/44: A metal-poor binary star with a unique chemical composition and Helmi stream kinematics
Nissen, P. E.; Schuster, W. J.; Silva-Cabrera, J. S.
Context. Correlations between high-precision elemental abundance ratios and the kinematics of halo stars provide interesting information about the formation and early evolution of the Galaxy.
Aims: Element abundances of G 112-43/44, a metal-poor wide-orbit binary star with extreme kinematics, are revisited.
Methods: High-precision studie…
Multiwavelength observations of a metric type-II event
Hillaris, A.; Patsourakos, S.; Nindos, A. +1 more
We have studied a complex metric radio event that originated in a compact flare, observed with the ARTEMIS-JLS radiospectrograph on February 12, 2010. The event was associated with a surge observed at 195 and 304 Å and with a coronal mass ejection observed by instruments on board STEREO A and B near the eastern and western limbs respectively. On t…
Spectral state transitions in Circinus ULX5
Markowitz, Alex; Mondal, Samaresh; De Marco, Barbara +2 more
Context. We performed timing and spectral analyses of multi-epoch Suzaku, XMM-Newton, and NuSTAR observations of the ultraluminous X-ray source (ULX) Circinus ULX5 with the aim of putting constraints on the mass of the central object and the accretion mode operating in this source.
Aims: We investigate whether the source contains a stellar ma…
X-ray emitting structures in the Vela SNR: ejecta anisotropies and progenitor stellar wind residuals
Miceli, M.; Bocchino, F.; Orlando, S. +6 more
Context. The Vela supernova remnant (SNR) shows several ejecta fragments (or shrapnel) protruding beyond the forward shock, which are most likely relics of anisotropies that developed during the supernova (SN) explosion. Recent studies have revealed high Si abundance in two shrapnel (shrapnel A and G), located in opposite directions with respect t…
Evidence of mud volcanism due to the rapid compaction of Martian tsunami deposits in southeastern Acidalia Planitia, Mars
Costard, François; Séjourné, Antoine; Di Pietro, Ilaria +2 more
Thumbprint terrain was first recognized in Viking Orbiter data and described as sets of alternating continuous parallel ridges and depressions up to several tens of kilometres in length, with high and low albedo respectively. We performed a geomorphological analysis of these features using both Context Camera and High Resolution Imaging Science Ex…
A detailed understanding of the rotation-activity relationship using the 300 Myr old open cluster NGC 3532
Strassmeier, K. G.; Barnes, S. A.; James, D. J. +2 more
Context. The coeval stars of young open clusters provide insights into the formation of the rotation-activity relationship that elude studies of multi-age field populations.
Aims: We measure the chromospheric activity of cool stars in the 300 Myr old open cluster NGC 3532 in concert with their rotation periods to study the mass-dependent morp…
Thin Current Sheet Behind the Dipolarization Front
Russell, C. T.; Escoubet, C. P.; Fazakerley, A. N. +18 more
We report a unique conjugate observation of fast flows and associated current sheet disturbances in the near-Earth magnetotail by MMS (Magnetospheric Multiscale) and Cluster preceding a positive bay onset of a small substorm at ∼14:10 UT, September 8, 2018. MMS and Cluster were located both at X ∼ −14 RE. A dipolarization front (DF) of …
Spectral properties of lunar impact melt deposits from Moon Mineralogy Mapper (M3) data
Tornabene, L. L.; Neish, C. D.; Cannon, K. M. +3 more
Lunar impact melt deposits have unusual surface properties, unlike any measured terrestrial lava flow. Radar observations suggest that they are incredibly rough at decimeter scales, but they appear smooth in high-resolution, meter-scale optical images. The cause of their unusual surface roughness is unknown. In this work, we investigate the proper…
Statistical Survey of Reservoir Phenomenon in Energetic Proton Events Observed by Multiple Spacecraft
Wang, Yang; Lyu, Dan; Xiao, Boxi +3 more
In this work, reservoir phenomenon in the decay phase of gradual solar energetic particle (SEP) events are investigated with two Helios and the IMP 8 spacecraft from 1976 January to 1980 March and two STEREO and the SOHO spacecraft from 2010 January to 2014 September. Using these data, 62 reservoir events of solar energetic protons were identified…
The spatially offset quasar E1821+643: new evidence for gravitational recoil
Jadhav, Yashashree; Robinson, Andrew; Almeyda, Triana +2 more
A galaxy merger is expected to cause the formation of a supermassive black hole (SMBH) binary, which itself eventually coalesces through the anisotropic emission of gravitational waves. This may result in the merged SMBH receiving a recoil kick velocity ~100-1000 kms-1, causing it to oscillate in the gravitational potential of the host …