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Explaining the rolling-pin distribution of suprathermal electrons behind dipolarization fronts
Cao, J. B.; Xu, Y.; Fu, H. S. +2 more
The rolling-pin distribution of suprathermal electrons (40-200 keV), showing electron pitch angles primarily at 0°, 90°, and 180°, has recently been reported behind dipolarization fronts (DFs) both in observations and simulations. The formation of such type of distribution, however, has been unclear so far. In this study, we present an observation…
Cosmic microwave background constraints on primordial black hole dark matter
Blum, Kfir; Flauger, Raphael; Aloni, Daniel
We revisit cosmic microwave background (CMB) constraints on primordial black hole dark matter. Spectral distortion limits from COBE/FIRAS do not impose a relevant constraint. Planck CMB anisotropy power spectra imply that primordial black holes with mBHgtrsim 5 Msolar are disfavored. However, this is susceptible to sizeable u…
Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. V. The Rapid Rotation of 47 Tuc Traced and Modeled in Three Dimensions
Anderson, J.; Piotto, G.; Vesperini, E. +5 more
High-precision proper motions of the globular cluster 47 Tuc have allowed us to measure for the first time the cluster rotation in the plane of the sky and the velocity anisotropy profile from the cluster core out to about 13‧. These profiles are coupled with prior measurements along the line of sight (LOS) and the surface brightness profile and f…
Galaxy Zoo: morphological classifications for 120 000 galaxies in HST legacy imaging
Scarlata, Claudia; Schawinski, Kevin; Griffith, Roger L. +18 more
We present the data release paper for the Galaxy Zoo: Hubble (GZH) project. This is the third phase in a large effort to measure reliable, detailed morphologies of galaxies by using crowdsourced visual classifications of colour-composite images. Images in GZH were selected from various publicly released Hubble Space Telescope legacy programmes con…
Buried AGNs in Advanced Mergers: Mid-infrared Color Selection as a Dual AGN Candidate Finder
Ellison, Sara L.; Ricci, Claudio; Blecha, Laura +7 more
A direct consequence of hierarchical galaxy formation is the existence of dual supermassive black holes, which may be preferentially triggered as active galactic nuclei (AGNs) during galaxy mergers. Despite decades of searching, however, dual AGNs are extremely rare, and most have been discovered serendipitously. Using the all-sky WISE survey, we …
Modeling observations of solar coronal mass ejections with heliospheric imagers verified with the Heliophysics System Observatory
Rodriguez, L.; Zhang, T. L.; Möstl, C. +19 more
We present an advance toward accurately predicting the arrivals of coronal mass ejections (CMEs) at the terrestrial planets, including Earth. For the first time, we are able to assess a CME prediction model using data over two thirds of a solar cycle of observations with the Heliophysics System Observatory. We validate modeling results of 1337 CME…
Tracing the Hercules stream with Gaia and LAMOST: new evidence for a fast bar in the Milky Way
Famaey, Benoit; Kawata, Daisuke; Hunt, Jason A. S. +1 more
The length and pattern speed of the Milky Way bar are still controversial. Photometric and spectroscopic surveys of the inner Galaxy, as well as gas kinematics, favour a long and slowly rotating bar, with corotation around a Galactocentric radius of 6 kpc. On the other hand, the existence of the Hercules stream in local velocity space favours a sh…
Intermittent Reconnection and Plasmoids in UV Bursts in the Low Solar Atmosphere
De Pontieu, B.; Martínez-Sykora, J.; Hansteen, V. H. +9 more
Magnetic reconnection is thought to drive a wide variety of dynamic phenomena in the solar atmosphere. Yet, the detailed physical mechanisms driving reconnection are difficult to discern in the remote sensing observations that are used to study the solar atmosphere. In this Letter, we exploit the high-resolution instruments Interface Region Imagin…
A tidal disruption event in the nearby ultra-luminous infrared galaxy F01004-2237
Mullaney, J.; Rose, M.; Tadhunter, C. +2 more
Tidal disruption events (TDEs), in which stars are gravitationally disrupted as they pass close to the supermassive black holes in the centres of galaxies 1 , are potentially important probes of strong gravity and accretion physics. Most TDEs have been discovered in large-area monitoring surveys of many thousands of galaxies, and a rela…
Rotating Starburst Cores in Massive Galaxies at z = 2.5
Übler, Hannah; Tamura, Yoichi; Kohno, Kotaro +21 more
We present spatially resolved ALMA observations of the CO J=3-2 emission line in two massive galaxies at z = 2.5 on the star-forming main sequence. Both galaxies have compact dusty star-forming cores with effective radii of {R}{{e}}=1.3+/- 0.1 {kpc} and {R}{{e}}=1.2+/- 0.1 {kpc} in the 870 µm continuum emission. The spa…