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A dynamical and radiation semi-analytical model of pulsar-star colliding winds along the orbit: Application to LS 5039
Molina, E.; Bosch-Ramon, V.
Context. Gamma-ray binaries are systems that emit nonthermal radiation peaking at energies above 1 MeV. One proposed scenario to explain their emission consists of a pulsar orbiting a massive star, with particle acceleration taking place in shocks produced by the interaction of the stellar and pulsar winds.
Aims: We develop a semi-analytical …
OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +31 more
We report the discovery and the analysis of the short ( ${t}_{{\rm{E}}}\lt 5$ days) planetary microlensing event, OGLE-2015-BLG-1771. The event was discovered by the Optical Gravitational Lensing Experiment, and the planetary anomaly (at I ∼ 19) was captured by The Korea Microlensing Telescope Network. The event has three surviving planetary model…
CANDELS Meets GSWLC: Evolution of the Relationship between Morphology and Star Formation Since z = 2
Faber, S. M.; Tacchella, Sandro; Salim, Samir +7 more
Galaxy morphology and its evolution over the cosmic epoch hold important clues for understanding the regulation of star formation (SF). However, studying the relationship between morphology and SF has been hindered by the availability of consistent data at different redshifts. Our sample, combining CANDELS (0.8 < z < 2.5) and the GALEX-SDSS-…
Can Subphotospheric Magnetic Reconnection Change the Elemental Composition in the Solar Corona?
Long, David M.; Brooks, David H.; Baker, Deborah +6 more
Within the coronae of stars, abundances of those elements with low first ionization potential (FIP) often differ from their photospheric values. The coronae of the Sun and solar-type stars mostly show enhancements of low-FIP elements (the FIP effect) while more active stars such as M dwarfs have coronae generally characterized by the inverse-FIP e…
Electron Temperature Anisotropy and Electron Beam Constraints from Electron Kinetic Instabilities in the Solar Wind
Xie, Huasheng; Wu, Dejin; Sun, Heyu +2 more
Electron temperature anisotropies and electron beams are nonthermal features of the observed nonequilibrium electron velocity distributions in the solar wind. In collision-poor plasmas these nonequilibrium distributions are expected to be regulated by kinetic instabilities through wave-particle interactions. This study considers electron instabili…
ALMA 0.88 mm Survey of Disks around Planetary-mass Companions
Herczeg, Gregory J.; Wilner, David J.; Kraus, Adam L. +6 more
Characterizing the physical properties and compositions of circumplanetary disks can provide important insights into the formation of giant planets and satellites. We report Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum observations of six planetary-mass (10-20 MJup) companions: CT Cha b, 1RXS 1609 b, ROXs 12 b…
Long tidal tails in merging galaxies and their implications
Bell, Eric F.; Valls-Gabaud, David; Duc, Pierre-Alain +8 more
We investigate the properties of long tidal tails using the largest to date sample of 461 merging galaxies with $\log (M_\ast /\rm M_\odot)\ge 9.5$ within 0.2 ≤ z ≤ 1 from the COSMOS survey in combination with Hubble Space Telescope imaging data. Long tidal tails can be briefly divided into three shape types: straight (41 per cent), curved (47 per…
Helium Line Emissivities in the Solar Corona
Andretta, V.; Del Zanna, G.; Storey, P. J. +1 more
We present new collisional-radiative models (CRMs) for helium in the quiescent solar corona and predict the emissivities of the He and He+ lines to be observed by DKIST, Solar Orbiter, and Proba-3. We discuss in detail the rates we selected for these models, highlighting several shortcomings we have found in previous work. As no previou…
On the Diversity of Jet Production Efficiency in Swift/BAT AGNs
Sikora, Marek; Gupta, Maitrayee; Rusinek, Katarzyna +1 more
We address the very large diversity of jet production efficiency in active galactic nuclei (AGNs) by using data on low-redshift AGNs selected from the Swift/BAT catalog and having black hole (BH) masses larger than 108.5 M⊙. Most of these AGNs accrete at intermediate rates and have bolometric luminosities dominated by mid-IR …
The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
Berton, Marco; Punsly, Brian; Marziani, Paola +1 more
We present a study of quasars with very redward asymmetric (RA) ultraviolet (UV) broad emission lines (BELs). An excess of redshifted emission has been previously shown to occur in the BELs of radio-loud quasars and is most extreme in certain blazars. Paradoxically, blazars are objects that are characterized by a highly relativistic blueshifted ou…