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Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko
Gunell, H.; Eriksson, A.; Karlsson, T. +7 more
The European Space Agency/Rosetta mission to comet 67P/Churyumov-Gerasimenko has provided several hundred observations of the cometary diamagnetic cavity induced by the interaction between outgassed cometary particles, cometary ions, and the solar wind magnetic field. Here we present the first electric field measurements of four preperihelion and …
Glory on Venus and selection among the unknown UV absorbers
Petrova, Elena V.
The comparison of the phase profiles of glories observed on the cloud top of Venus by the Venus Monitoring Camera (Venus Express) and the light-scattering characteristics of sulfuric acid droplets, containing admixtures with a high refractive index, makes it easier to choose between some candidates for the so-called unknown UV absorber in the Venu…
A New Globular Cluster in the Area of VVVX
Minniti, D.; Bonatto, C.; Bica, E. +1 more
We communicate the discovery of a new globular cluster in the Galaxy that was first detected on WISE/2MASS images and is now confirmed with VVVX photometry. It is a Palomar-like cluster projected at ℓ = 359.15°, b = 5.73°, and may be related to the bulge. We derive an absolute magnitude of MV ≈ -3.3, thus being an underluminous globular…
Discovery of an Active Intermediate-mass Black Hole Candidate in the Barred Bulgeless Galaxy NGC 3319
Shu, Xinwen; Zhou, Hongyan; Jiang, Ning +7 more
We report the discovery of an active intermediate-mass black hole (IMBH) candidate in the center of nearby barred bulgeless galaxy NGC 3319. The point X-ray source revealed by archival Chandra and XMM-Newton observations is spatially coincident with the optical and UV galactic nuclei from Hubble Space Telescope observations. The spectral energy di…
Tailward Propagation of Magnetic Energy Density Variations With Respect to Substorm Onset Times
Jackman, Caitriona M.; Coxon, John C.; Freeman, Mervyn P. +3 more
During geomagnetic substorms, around 1015 J of energy is extracted from the solar wind and processed by the Earth's magnetosphere. Prior to the onset of substorm expansion phases, this energy is thought to be largely stored as an increase in the magnetic field in the magnetotail lobes. However, how, when, and where this energy is stored…
The seven sisters DANCe. III. Projected spatial distribution
Bertin, E.; Bouy, H.; Sarro, L. M. +6 more
Context. Membership analyses of the DANCe and Tycho + DANCe data sets provide the largest and least contaminated sample of Pleiades candidate members to date.
Aims: We aim at reassessing the different proposals for the number surface density of the Pleiades in the light of the new and most complete list of candidate members, and inferring the…
A combined Compton and coded-aperture telescope for medium-energy gamma-ray astrophysics
Boggs, Steven E.; Zoglauer, Andreas; Galloway, Michelle +1 more
A future mission in medium-energy gamma-ray astrophysics would allow for many scientific advancements, such as a possible explanation for the excess positron emission from the Galactic center, a better understanding of nucleosynthesis and explosion mechanisms in Type Ia supernovae, and a look at the physical forces at play in compact objects such …
Refining the origins of the gamma-ray binary 1FGL J1018.6-5856
Marcote, B.; Edwards, P. G.; Paredes, J. M. +2 more
Context. Gamma-ray binaries are systems composed of a massive star and a compact object that exhibit emission from radio to very high energy gamma rays. They are ideal laboratories to study particle acceleration and a variety of physical processes that vary as a function of the orbital phase.
Aims: We aim to study the radio emission of the ga…
Measuring the Local ISM along the Sight Lines of the Two Voyager Spacecraft with HST/STIS
Redfield, Seth; Wood, Brian E.; Linsky, Jeffrey L. +1 more
In 2012 August, Voyager 1 crossed the heliopause, becoming the first human-made object to exit the solar system. This milestone signifies the beginning of an important new era for local interstellar medium (LISM) exploration. We present measurements of the structure and composition of the LISM in the immediate path of the Voyager spacecraft by usi…
Predicting gravitational lensing by stellar remnants
Lépine, S.; Harding, Alexander J.; Stefano, R. Di +3 more
Gravitational lensing provides a means to measure mass that does not rely on detecting and analysing light from the lens itself. Compact objects are ideal gravitational lenses, because they have relatively large masses and are dim. In this paper, we describe the prospects for predicting lensing events generated by the local population of compact o…