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Observations of a mix of cold and warm electrons by RPC-MIP at 67P/Churyumov-Gerasimenko
Henri, P.; Rubin, M.; Eriksson, A. I. +8 more
Context. The Mutual Impedance Probe (MIP) of the Rosetta Plasma Consortium (RPC) onboard the Rosetta orbiter which was in operation for more than two years, between August 2014 and September 2016 to monitor the electron density in the cometary ionosphere of 67P/Churyumov-Gerasimenko. Based on the resonance principle of the plasma eigenmodes, recen…
Deflection of the hypervelocity stars by the pull of the Large Magellanic Cloud on the Milky Way
Erkal, D.; Boubert, D.; Gualandris, A.
Stars slingshotted by the supermassive black hole at the Galactic Centre escape from the Milky Way so quickly that their trajectories are almost straight lines. Previous works have shown how these 'hypervelocity stars' (stars moving faster than the local Galactic escape speed) are subsequently deflected by the gravitational field of the Milky Way …
The Relationship between Chirality, Sense of Rotation, and Hemispheric Preference of Solar Eruptive Filaments
Wang, Yuming; Liu, Rui; Jiang, Chaowei +4 more
The orientation, chirality, and dynamics of solar eruptive filaments are key to our understanding of the magnetic field of coronal mass ejections (CMEs), and therefore to predicting the geoeffectiveness of CMEs arriving at Earth. However, confusion and contention remain over the relationship between the filament chirality, magnetic helicity, and t…
The distribution of dark matter and gas spanning 6 Mpc around the post-merger galaxy cluster MS 0451-03
Smith, Graham P.; Ellis, Richard S.; Massey, Richard +11 more
Using the largest mosaic of Hubble Space Telescope images around a galaxy cluster, we map the distribution of dark matter throughout an ∼6 × 6 Mpc2 area centred on the cluster MS 0451-03 (z = 0.54, $M_{200}=1.65\times 10^{15}\, {\rm M}_{\odot }$ ). Our joint strong- and weak-lensing analysis shows three possible filaments extending from…
ALMA Observations of Giant Molecular Clouds in M33. II. Triggered High-mass Star Formation by Multiple Gas Colliding Events at the NGC 604 Complex
Kuno, Nario; Tokuda, Kazuki; Tachihara, Kengo +13 more
We present the results of ALMA observations in 12CO(J = 2 - 1), 13CO(J = 2 - 1), and C18O(J = 2 - 1) lines and 1.3 mm continuum emission toward a massive (∼106 M⊙) giant molecular cloud associated with the giant H II region NGC 604 in one of the nearest spiral galaxies, M33, at an angular reso…
Exploring the coronal evolution of AR 12473 using time-dependent, data-driven magnetofrictional modelling
Kilpua, E. K. J.; Pomoell, J.; Price, D. J.
Aims: We present a detailed examination of the magnetic evolution of AR 12473 using time-dependent, data-driven magnetofrictional modelling.
Methods: We used maps of the photospheric electric field inverted from vector magnetogram observations, obtained by the Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory (SDO),…
Two Episodes of a Filament Eruption from a Fan-spine Magnetic Configuration
Yang, Jiayan; Hong, Junchao; Li, Haidong +1 more
In this paper, we present detailed observations of a filament eruption associated with a B6.0 flare, a jet-like coronal mass ejection (CME), and a type-III radio burst on 2013 March 2. The filament, which is located at the northwest edge of active region (AR) 11183, experienced a partial and then a full eruption. Each episode of the filament erupt…
Predicting the global far-infrared SED of galaxies via machine learning techniques
Bianchi, S.; Fritz, J.; Galliano, F. +10 more
Context. Dust plays an important role in shaping a galaxy's spectral energy distribution (SED). It absorbs ultraviolet (UV) to near-infrared radiation and re-emits this energy in the far-infrared (FIR). The FIR is essential to understand dust in galaxies. However, deep FIR observations require a space mission, none of which are still active today.…
Martian Ionopause Boundary: Coincidence With Photoelectron Boundary and Response to Internal and External Drivers
Gurnett, D. A.; Morgan, D. D.; Halekas, J. +8 more
The Martian ionopause boundary detected as steep gradients in the local electron density profiles from the Mars Advanced Radar for Subsurface and Ionospheric Sounder on Mars Express is studied individually and statistically and compared to the photoelectron boundary identified by the drop of photoelectron signature due to CO2 and O mole…
Response to a comment on Dessert et al. "The dark matter interpretation of the 3.5 keV line is inconsistent with blank-sky observations"
Safdi, Benjamin R.; Dessert, Christopher; Rodd, Nicholas L.
The dark matter explanation of the 3.5 keV line is strongly disfavored by our work in Dessert et al. (2020). Boyarsky et al. (2004) questions that conclusion: modeling additional background lines is claimed to weaken the limit sufficiently to re-allow a dark matter interpretation. We respond as follows. (1) A more conservative limit is obtained by…