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Spatially Resolved Outflows in a Seyfert Galaxy at z = 2.39
Dahle, H.; Rigby, J. R.; Sharon, K. +11 more
We present the first spatially resolved analysis of rest-frame optical and UV imaging and spectroscopy for a lensed galaxy at z = 2.39 hosting a Seyfert active galactic nucleus (AGN). Proximity to a natural guide star has enabled observations with high signal-to-noise ratio using Very Large Telescope SINFONI + adaptive optics (AO) of rest-frame op…
Accurate effective temperature from Hα profiles
Pasquini, L.; Ludwig, H. -G.; Porto de Mello, G. F. +4 more
Context. The determination of stellar effective temperature (Teff) in F, G, and K stars using Hα profile fitting is a quite remarkable and powerful tool because it does not depend on reddening and is only slightly sensitive to other atmospheric parameters. Nevertheless, this technique is not frequently used because of the complex proced…
On the Origin of Ortho-Gardenhose Heliospheric Flux
Lockwood, Mike; Owens, Mathew J.; Macneil, Allan
Parker-spiral theory predicts that the heliospheric magnetic field (HMF) will have components of opposite polarity radially toward the Sun and tangentially antiparallel to the solar rotation direction (i.e., in Geocentric Solar Ecliptic (GSE) coordinates, with BX/BY<0 ). This theory explains the average orientation of the …
Flying far and fast: the distribution of distant hypervelocity star candidates from Gaia DR2 data
de la Fuente Marcos, R.; de la Fuente Marcos, C.
Context. Hypervelocity stars move fast enough to leave the gravitational field of their home galaxies and venture into intergalactic space. The most extreme examples known have estimated speeds in excess of 1000 km s-1. These can be easily induced at the centres of galaxies via close encounters between binary stars and supermassive blac…
Uncertainty Quantification in Sunspot Counts
Mathieu, Sophie; von Sachs, Rainer; Ritter, Christian +2 more
Observing and counting sunspots constitutes one of the longest-running scientific experiments, with first observations dating back to Galileo (around 1610). Today the sunspot number (SN) time series acts as a benchmark of solar activity in a large range of physical models. An appropriate statistical modeling, adapted to the time series’ complex na…
Jovian High-Latitude Ionospheric Ions: Juno In Situ Observations
Thomsen, M. F.; Wilson, R. J.; Louarn, P. +10 more
The low-altitude, high-velocity trajectory of the Juno spacecraft enables the Jovian Auroral Distributions Experiment to make the first in situ observations of the high-latitude ionospheric plasma. Ions are observed to energies below 1 eV. The high-latitude ionospheric ions are observed simultaneously with a loss cone in the magnetospheric ions, s…
A New Automatic Tool for CME Detection and Tracking with Machine-learning Techniques
Zhang, Yan; Feng, Li; Lu, Lei +7 more
With the accumulation of coronal mass ejection (CME) observations by coronagraphs, automatic detection and tracking of CMEs has proven to be crucial. The excellent performance of the convolutional neural network in image classification, object detection, and other computer vision tasks motivates us to apply it to CME detection and tracking as well…
Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
Ginski, C.; Benisty, M.; de Boer, J. +10 more
Context. Protoplanetary disks are the birth environments of planetary systems. Therefore, the study of young, circumstellar environments is essential in understanding the processes taking place in planet formation and the evolution of planetary systems.
Aims: We detect and characterize circumstellar disks and potential companions around solar…
Coronal Imaging with the Solar UltraViolet Imager
Seaton, Daniel B.; Tadikonda, Sivakumara K.; Krimchansky, Alexander +3 more
We investigate the coronal imaging capabilities of the Solar UltraViolet Imager (SUVI) on board the Geostationary Operational Environmental Satellite-R series spacecraft. Nominally Sun-pointed, SUVI provides solar images in six extreme ultraviolet (EUV) wavelengths. On-orbit data indicated that SUVI had sufficient dynamic range and sensitivity to …
Machine-learning identification of asteroid groups
Carruba, V.; Aljbaae, S.; Lucchini, A.
Asteroid families are groups of asteroids that share a common origin. They can be the outcome of a collision or be the result of the rotational failure of a parent body or its satellites. Collisional asteroid families have been identified for several decades using hierarchical clustering methods (HCMs) in proper elements domains. In this method, t…