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Global Model of Whistler Mode Chorus in the Near-Equatorial Region (|λm|< 18°)
Shen, Xiao-Chen; Meredith, Nigel P.; Horne, Richard B. +2 more
We extend our database of whistler mode chorus, based on data from seven satellites, by including ∼3 years of data from Radiation Belt Storm Probes (RBSP)-A and RBSP-B and an additional ∼6 years of data from Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A, THEMIS-D, and THEMIS-E. The new database allows us to probe t…
Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
Eggenberger, P.; Spada, F.; Deheuvels, S. +3 more
Context. Asteroseismic measurements of the internal rotation of subgiants and red giants all show the need for invoking a more efficient transport of angular momentum than theoretically predicted. Constraints on the core rotation rate are available starting from the base of the red giant branch (RGB) and we are still lacking information on the int…
In pursuit of giants. I. The evolution of the dust-to-stellar mass ratio in distant dusty galaxies
Gómez-Guijarro, C.; Małek, K.; Feltre, A. +11 more
The dust-to-stellar mass ratio (Mdust/M⋆) is a crucial, albeit poorly constrained, parameter for improving our understanding of the complex physical processes involved in the production of dust, metals, and stars in galaxy evolution. In this work, we explore trends of Mdust/M⋆ with different physical par…
MUSE Analysis of Gas around Galaxies (MAGG) - I: Survey design and the environment of a near pristine gas cloud at z ≈ 3.5
Prochaska, J. Xavier; Lusso, Elisabeta; Murphy, Michael T. +9 more
We present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi-Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT), which targets 28 z > 3.2 quasars to investigate the connection between optically thick gas and galaxies at z ∼ 3-4. MAGG maps…
The Galaxy "Missing Dark Matter" NGC 1052-DF4 is Undergoing Tidal Disruption
Trujillo, Ignacio; Borlaff, Alejandro S.; Monelli, Matteo +4 more
The existence of long-lived galaxies lacking dark matter represents a challenge to our understanding of how galaxies form. Here, we present evidence that explains the lack of dark matter in one such galaxy: NGC 1052-DF4. Deep optical imaging of the system has detected tidal tails in this object caused by its interaction with its neighboring galaxy…
Evidence for reduced magnetic braking in polars from binary population models
Gänsicke, Boris T.; Belloni, Diogo; Pala, Anna F. +3 more
We present the first population synthesis of synchronous magnetic cataclysmic variables, called polars, taking into account the effect of the white dwarf (WD) magnetic field on angular momentum loss. We implemented the reduced magnetic braking (MB) model proposed by Li, Wu & Wickramasinghe into the Binary Stellar Evolution (BSE) code recently …
Collimated synchrotron threads linking the radio lobes of ESO 137-006
Govoni, F.; Ramaila, A. J. T.; Serra, P. +14 more
We present MeerKAT 1000 MHz and 1400 MHz observations of a bright radio galaxy in the southern hemisphere, ESO 137-006. The galaxy lies at the centre of the massive and merging Norma galaxy cluster. The MeerKAT continuum images (rms ∼0.02 mJy beam-1 at ∼10″ resolution) reveal new features that have never been seen in a radio galaxy befo…
The Red Supergiant Binary Fraction of the Large Magellanic Cloud
Drout, Maria R.; Massey, Philip; Levesque, Emily M. +2 more
The binary fraction of unevolved massive stars is thought to be 70%-100% but there are few observational constraints on the binary fraction of the evolved version of a subset of these stars, the red supergiants (RSGs). Here we identify a complete sample of RSGs in the Large Magellanic Cloud (LMC) using new spectroscopic observations and archival U…
Valley formation on early Mars by subglacial and fluvial erosion
Osinski, Gordon R.; Grau Galofre, Anna; Jellinek, A. Mark
The southern highlands of Mars are dissected by hundreds of valley networks, which are evidence that water once sculpted the surface. Characterizing the mechanisms of valley incision may constrain early Mars climate and the search for ancient life. Previous interpretations of the geological record require precipitation and surface water runoff to …
Fluvial Regimes, Morphometry, and Age of Jezero Crater Paleolake Inlet Valleys and Their Exobiological Significance for the 2020 Rover Mission Landing Site
Mangold, Nicolas; Quantin-Nataf, Cathy; Massé, Marion +5 more
Jezero crater has been selected as the landing site for the Mars 2020 Perseverance rover, because it contains a paleolake with two fan-deltas, inlet and outlet valleys. Using the data from the High Resolution Stereo Camera (HRSC) and the High Resolution Imaging Science Experiment (HiRISE), we conducted a quantitative geomorphological study of the …