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On the estimation of stellar parameters with uncertainty prediction from Generative Artificial Neural Networks: application to Gaia RVS simulated spectra
Allende Prieto, C.; Garabato, D.; Álvarez, M. A. +4 more
Aims: We present an innovative artificial neural network (ANN) architecture, called Generative ANN (GANN), that computes the forward model, that is it learns the function that relates the unknown outputs (stellar atmospheric parameters, in this case) to the given inputs (spectra). Such a model can be integrated in a Bayesian framework to esti…
Interactions between magnetosonic waves and ring current protons: Gyroaveraged test particle simulations
Zhang, Hui; Huang, Shiyong; Fu, Song +6 more
Gyroaveraged test particle simulations are implemented to quantitatively investigate interactions between linearly polarized magnetosonic waves (i.e., equatorial noises) and ring current protons inside and outside the plasmasphere at L = 4.5. For magnetosonic waves at the frequency of 33.3 Hz (fw/fcp = 6.4 at the magnetic equ…
The Gigaelectronvolt Counterpart of VER J2019+407 in the Northern Shell of the Supernova Remnant G78.2+2.1 (γ Cygni)
Fraija, N.; Araya, M.
Analysis of gamma-ray emission from the supernova remnant G78.2+2.1 (γ Cygni) with 7.2 years of cumulative data from the Fermi Large Area Telescope shows a distinct hard, bright, and extended component to the north of the shell coincident with the known teraelectronvolt source VER J2019+407. In the gigaelectronvolt to teraelectronvolt (GeV-TeV) en…
Merging Galaxies with Tidal Tails in COSMOS to z = 1
Zheng, Xian Zhong; Wen, Zhang Zheng
Tidal tails are created in major mergers involving disk galaxies. It remains to be explored how the tidal tails trace the assembly history of massive galaxies. We identify a sample of 461 merging galaxies with long tidal tails, from 35,076 galaxies mass-complete at {M}\star ≥slant {10}9.5 {M}⊙ and 0.2≤slant z≤slan…
Formation of layers of methane in the atmosphere of Mars after surface release
Daerden, F.; Neary, L.; Viscardy, S.
Simulations with a general circulation model for the atmosphere of Mars show that surface emissions of methane can result in a highly nonuniform vertical distribution throughout the atmosphere, including the formation of layers, during the first weeks after the release. The fate of the released methane is determined by the global circulation patte…
The XXL Survey. VIII. MUSE characterisation of intracluster light in a z ~ 0.53 cluster of galaxies
Pierre, M.; Willis, J.; Adami, C. +11 more
Aims: Within a cluster, gravitational effects can lead to the removal of stars from their parent galaxies and their subsequent dispersal into the intracluster medium. Gas hydrodynamical effects can additionally strip gas and dust from galaxies; both gas and stars contribute to intracluster light (ICL). The properties of the ICL can therefore …
Joint analysis of galaxy-galaxy lensing and galaxy clustering: Methodology and forecasts for Dark Energy Survey
Benoit-Lévy, A.; Nichol, R. C.; Finley, D. A. +69 more
The joint analysis of galaxy-galaxy lensing and galaxy clustering is a promising method for inferring the growth function of large-scale structure. Anticipating a near future application of this analysis to Dark Energy Survey (DES) measurements of galaxy positions and shapes, we develop a practical approach to modeling the assumptions and systemat…
The spectrum of Jupiter's Great Red Spot: The case for ammonium hydrosulfide (NH4SH)
Chanover, Nancy J.; Simon, Amy A.; Hudson, Reggie L. +1 more
Here we present new ultraviolet-visible spectra of irradiated ammonium hydrosulfide (NH4SH), a reported jovian atmospheric cloud component, for a range of temperatures and radiation doses and make assignments to the spectral features. We show that the combination of radiolysis and thermal annealing of NH4SH causes the origina…
Identifying IGR J14091-6108 as a magnetic CV with a massive white dwarf using X-ray and optical observations
Strader, Jay; Chomiuk, Laura; Rahoui, Farid +3 more
INTEGRAL Gamma-Ray (IGR) J14091-6108 is a Galactic X-ray source known to have an iron emission line, a hard X-ray spectrum, and an optical counterpart. Here, we report on X-ray observations of the source with XMM-Newton and NuSTAR as well as optical spectroscopy with European Southern Obseratory/Very Large Telescope and National Optical Astronomy …
The Detection and Statistics of Giant Arcs behind CLASH Clusters
Zheng, Wei; Zitrin, Adi; Frye, Brenda +10 more
We developed an algorithm to find and characterize gravitationally lensed galaxies (arcs) to perform a comparison of the observed and simulated arc abundance. Observations are from the Cluster Lensing And Supernova survey with Hubble (CLASH). Simulated CLASH images are created using the MOKA package and also clusters selected from the high-resolut…