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The seventh inner moon of Neptune
Showalter, M. R.; de Pater, I.; Lissauer, J. J. +1 more
During its 1989 flyby, the Voyager 2 spacecraft imaged six small moons of Neptune, all with orbits well interior to that of the large, retrograde moon Triton1. Along with a set of nearby rings, these moons are probably younger than Neptune itself; they formed shortly after the capture of Triton and most of them have probably been fragme…
Broadband Spectral Energy Distributions of SDSS-selected Quasars and of Their Host Galaxies: Intense Activity at the Onset of AGN Feedback
Lapi, Andrea; Gilli, Roberto; Baccigalupi, Carlo +3 more
We present the mean spectral energy distribution (SED) of a sample of optically selected quasars (QSOs) at redshifts of 1 ≤ z ≤ 5. To derive it, we exploit photometric information from the Sloan Digital Sky Survey, UKIRT Infrared Deep Sky Survey, and Wide-field Infrared Survey Explorer surveys in combination with a stacking analysis of Herschel, A…
Multiband Galaxy Morphologies for CLASH: A Convolutional Neural Network Transferred from CANDELS
Demarco, R.; Huertas-Company, M.; Cabrera-Vives, G. +5 more
We present visual-like morphologies over 16 photometric bands, from ultraviolet to near-infrared, for 8412 galaxies in the Cluster Lensing And Supernova survey with Hubble (CLASH) obtained using a convolutional neural network (ConvNet) model. Our model follows the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) main morphologica…
Measuring the ionisation fraction in a jet from a massive protostar
Sanna, A.; Purser, S. J. D.; Ray, T. P. +7 more
It is important to determine if massive stars form via disc accretion, like their low-mass counterparts. Theory and observation indicate that protostellar jets are a natural consequence of accretion discs and are likely to be crucial for removing angular momentum during the collapse. However, massive protostars are typically rarer, more distant an…
Star Formation Histories of the LEGUS Spiral Galaxies. I. The Flocculent Spiral NGC 7793
Cignoni, M.; Tosi, M.; Sabbi, E. +13 more
We present a detailed study of the flocculent spiral galaxy NGC 7793, part of the Sculptor group. By analyzing the resolved stellar populations of the galaxy, located at a distance of ∼3.7 Mpc, we infer for the first time its radial star formation history (SFH) from Hubble Space Telescope photometry, thanks to both archival and new data from the L…
A Two-sided Loop X-Ray Solar Coronal Jet Driven by a Minifilament Eruption
Harra, Louise K.; Moore, Ronald L.; Sterling, Alphonse C. +1 more
Most of the commonly discussed solar coronal jets are the type that consist of a single spire extending approximately vertically from near the solar surface into the corona. Recent research supports that eruption of a miniature filament (minifilament) drives many such single-spire jets and concurrently generates a miniflare at the eruption site. A…
IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
Östlin, Göran; Roth, Martin M.; Micheva, Genoveva +2 more
Context. Mrk 71/NGC 2366 is the closest green pea (GP) analog and candidate Lyman Continuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detected through direct observations of the ionizing continuum, making this the most abundant class of confirmed LyC-emitters at any redshift. High resolution, multiwavelength studies of GPs can lead to …
Joint X-Ray, EUV, and UV Observations of a Small Microflare
Krucker, Säm; White, Stephen M.; Grefenstette, Brian W. +5 more
We present the first joint observation of a small microflare in X-rays with the Nuclear Spectroscopic Telescope ARray (NuSTAR), in UV with the Interface Region Imaging Spectrograph (IRIS), and in EUV with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA). These combined observations allow us to study the hot coronal and cooler …
CHANG-ES. XIV. Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631
Beck, Rainer; Kamieneski, Patrick; Irwin, Judith +13 more
Aims: NGC 4631 is an interacting galaxy that exhibits one of the largest, gaseous halos observed among edge-on galaxies. We aim to examine the synchrotron and cosmic-ray propagation properties of its disk and halo emission with new radio continuum data.
Methods: Radio continuum observations of NGC 4631 were performed with the Karl G. Jan…
Light dark matter from leptogenesis
Falkowski, Adam; Kuflik, Eric; Levi, Noam +1 more
We consider the implications of a shared production mechanism between the baryon asymmetry of the universe and the relic abundance of dark matter, that does not result in matching asymmetries. We present a simple model within a two sector leptogenesis framework, in which right handed sterile neutrinos decay out of equilibrium to both the standard …