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Multiepoch VLBI of L Dwarf Binary 2MASS J0746+2000AB: Precise Mass Measurements and Confirmation of Radio Emission from Both Components
Hallinan, Gregg; Zhang, Qicheng; Golden, Aaron +2 more
Surveys have shown that up to 1/10th of all ultracool dwarfs (UCDs) are appreciable radio emitters, with their emission attributed to a combination of gyrosynchrotron radiation and the electron cyclotron maser instability. 2M J0746+2000AB is a close stellar binary comprised of an L0 and L1.5 dwarf that was previously identified as a source of 5 GH…
The Most Probable 3D Orbit for Spectroscopic Binaries
Docobo, José A.; Campo, Pedro P.; Abushattal, Ahmad A.
Binary stars are a very important source of astronomical information. Those short-period binaries observed by means of both spectroscopy and interferometry can provide, through their corresponding orbits, precise values regarding individual masses as well as orbital parallaxes. For this reason, it is fundamental to attempt to optically resolve dou…
Heliospheric Structure as Revealed by the 3-88 keV H ENA Spectra
Schwadron, N. A.; Pogorelov, N. V.; Zank, G. P. +8 more
Energetic neutral atoms (ENAs) are an important tool for investigating the structure of the heliosphere. Recently, it was observed that fluxes of ENAs (with energy ≤55 keV) coming from the upwind and downwind regions of the heliosphere are similar in strength. This led the authors of these observations to hypothesize that the heliosphere is bubble…
Molecular gas in distant brightest cluster galaxies
Castignani, G.; Combes, F.; Salomé, P. +1 more
The mechanisms governing the stellar mass assembly and star formation history of brightest cluster galaxies (BCGs) are still being debated. By means of new and archival molecular gas observations we investigate the role of dense megaparsec-scale environments in regulating the fueling of star formation in distant BCGs, through cosmic time. We obser…
SUMER Measurement of the Fe X 3p43d 4D5/2,7/2 Energy Difference
Landi, E.; Li, W.; Hutton, R. +1 more
Recent studies have shown that magnetic fields in the solar corona are strong enough to significantly mix the two 3p43d 4D5/2,7/2 levels in Cl-like Fe X. This mixing gives rise to a magnetically induced transition (MIT) component in the bright Fe X 257.3 Å line, commonly observed by current instrumentation, that ca…
WR 72: a born-again planetary nebula with hydrogen-poor knots
Gvaramadze, V. V.; Gräfener, G.; Langer, N. +1 more
We report the discovery of a handful of optical hydrogen-poor (H-poor) knots in the central part of an extended infrared nebula centred on the [WO1] star WR 72, obtained by spectroscopic and imaging observations with the Southern African Large Telescope (SALT). Wide-field Infrared Survey Explorer (WISE) images of the nebula show that it is compose…
Uncovering the Primary X-Ray Emission and Possible Starburst Component in the Polarized NLS1 Mrk 1239
Komossa, S.; Gallo, Luigi C.; Grupe, Dirk +2 more
X-ray observations of the unique NLS1 galaxy Mrk 1239 spanning 18 yr are presented. Data from XMM-Newton, Suzaku, Swift, and NuSTAR are combined to obtain a broadband, multi-epoch view of the source. There is spectral variability in the 3-10 keV band over the 18 yr. An analysis of the NuSTAR and Suzaku lightcurves also suggests rapid variability i…
The PAU Survey: background light estimation with deep learning techniques
Carretero, J.; Castander, F. J.; García-Bellido, J. +17 more
In any imaging survey, measuring accurately the astronomical background light is crucial to obtain good photometry. This paper introduces BKGNET, a deep neural network to predict the background and its associated error. BKGNET has been developed for data from the Physics of the Accelerating Universe Survey (PAUS), an imaging survey using a 40 narr…
EUV-dependence of Venusian dayside ionopause altitude: VEX and PVO observations
Futaana, Yoshifumi; Fraenz, Markus; Wei, Yong +6 more
Average Radial Structures of Gas Convection in the Solar Granulation
Shimizu, T.; Oba, T.; Iida, Y.
Gas convection is observed in the solar photosphere as granulation, I.e., having highly time-dependent cellular patterns, consisting of numerous bright cells called granules and dark surrounding channels called intergranular lanes. Many efforts have been made to characterize the granulation, which may be used as an energy source for various types …