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Discovery of an old nova remnant in the Galactic globular cluster M 22
Bacon, Roland; Brinchmann, Jarle; Schmidt, Kasper B. +11 more
A nova is a cataclysmic event on the surface of a white dwarf in a binary system that increases the overall brightness by several orders of magnitude. Although binary systems with a white dwarf are expected to be overabundant in globular clusters compared with in the Galaxy, only two novae from Galactic globular clusters have been observed. We pre…
Present-day development of gully-channel sinuosity by carbon dioxide gas supported flows on Mars
Massé, Marion; Conway, Susan J.; Vincendon, Mathieu +7 more
Martian gullies have been widely studied, but their formation mechanism is still under debate. Their channels generally trend straight downslope, but some display sinuosity. Seasonally active gullies are common on sand dunes and their channels have been reported to develop sinuosity. Here, we perform a detailed analysis of a gully on a dune within…
Star formation quenching imprinted on the internal structure of naked red nuggets
van de Ven, Glenn; Yıldırım, Akın; Martín-Navarro, Ignacio
The formation and assembly process of massive galaxies is a combination of two phases: an initial in-situ-dominated one followed by an ex-situ-dominated evolution. Separating these two contributions is therefore crucial to understand the baryonic cycle within massive haloes. A recently discovered population of so-called naked red nuggets, galaxies…
Free-form GRALE reconstruction of Abell 2744: robustness of uncertainties against changes in lensing data
Medezinski, Elinor; Okabe, Nobuhiro; Liesenborgs, Jori +2 more
Abell 2744, a massive Hubble Frontier Fields merging galaxy cluster with many multiple images in the core has been the subject of many lens inversions using different methods. While most existing studies compare various inversion methods, we focus on a comparison of reconstructions that use different input lensing data. Since the quantity and qual…
Limits on a population of collisional-triples as progenitors of Type-Ia supernovae
Maoz, Dan; Hallakoun, Na'ama
The progenitor systems of Type-Ia supernovae (SNe Ia) are yet unknown. The collisional-triple SN Ia progenitor model posits that SNe Ia result from head-on collisions of binary white dwarfs (WDs), driven by dynamical perturbations by the tertiary stars in mild-hierarchical triple systems. To reproduce the Galactic SN Ia rate, at least ∼30-55 per c…
Visual Orbits of Spectroscopic Binaries with the CHARA Array. I. HD 224355
Gies, Douglas R.; Lester, Kathryn V.; Monnier, John D. +5 more
We present the visual orbit of the double-lined spectroscopic binary HD 224355 from interferometric observations with the CHARA Array, as well as an updated spectroscopic analysis using echelle spectra from the Apache Point Observatory 3.5 m telescope. By combining the visual and spectroscopic orbital solutions, we find the binary components to ha…
High-fidelity Imaging of the Inner AU Mic Debris Disk: Evidence of Differential Wind Sculpting?
Stark, Christopher C.; Kowalski, Adam F.; Davenport, James R. A. +17 more
We present new high-fidelity optical coronagraphic imagery of the inner ∼50 au of AU Mic’s edge-on debris disk using the BAR5 occulter of the Hubble Space Telescope Imaging Spectrograph (HST/STIS) obtained on 2018 July 26-27. This new imagery reveals that “feature A,” residing at a projected stellocentric separation of 14.2 au on the southeast sid…
An extremely X-ray weak blazar at z = 5
Ghisellini, G.; Moretti, A.; Caccianiga, A. +5 more
We present the discovery and properties of DES J014132.4-542749.9 (DES0141-54), a new powerful radio-loud active galactic nucleus (AGN) in the early Universe (z = 5.0). It was discovered by cross-matching the first data release of the Dark Energy Survey (DES DR1) with the Sidney University Molonglo Survey (SUMSS) radio catalog at 0.843 GHz. This o…
Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn's magnetosphere
Singh, Manpreet; Saini, N. S.; Kourakis, I.
Thanks to the evidence provided by the Cassini spacecraft mission, it is now established that Saturn's magnetospheric plasma consists of various types of positive ions, as well as two distinct populations of electrons, at different temperatures. The electron population energy distributions are characterized by long suprathermal tails and have been…
Hubble Space Telescope Emission-line Images of Nearby 3CR Radio Galaxies: Two Photoionization, Accretion, and Feedback Modes
Sparks, William B.; Chiaberge, Marco; Capetti, Alessandro +3 more
We present HST/ACS narrowband images of a low-z sample of 19 3C radio galaxies to study the Hα and [O III] emissions from the narrow-line region. Based on nuclear emission-line ratios, we divide the sample into high- and low-excitation galaxies (HEGs and LEGs). We observe different line morphologies, extended [O III] emission, large [O III]/Hα sca…