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Discovery of a Low-redshift Damped Lyα System in a Foreground Extended Disk Using a Starburst Galaxy Background Illuminator
Heckman, Timothy M.; Alexandroff, Rachael M.; Jansen, Rolf A. +3 more
We present the discovery of a low-redshift damped Lyα (DLA) system in the spectrum of background starburst galaxy SDSS J111323.88+293039.3 (z = 0.17514). The DLA is at an impact parameter of ρ = 36 kpc from the star-forming galaxy, SDSS J111324.08+293051.2 (z = 0.17077). We measure an H column density of N(H ) = 3.47 × 1020 cm-2
Four 'Peculiar' RRd stars observed by K2
Nemec, James M.; Moskalik, Paweł
Four stars pulsating simultaneously with a dominant period PD ∈ (0.28, 0.39) d and an additional period PA ∈ (0.20, 0.27) d have been identified from among the more than 3000 RR Lyrae stars observed by the Kepler space telescope during NASA's K2 Mission. All four stars are located in the direction of the Galactic Bulge and ha…
The nature and likely redshift of GLEAM J0917-0012
Lehnert, Matthew D.; Stern, Daniel; De Breuck, Carlos +10 more
We previously reported a putative detection of a radio galaxy at $z=10.15$ , selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The redshift of this source, GLEAM J0917-0012, was based on three weakly detected molecular emission lines observed with the Atacama Large Millimetre Array (ALMA). In order to c…
Strong Hα emission in the young planetary mass companion 2MASS J0249-0557 c
Béjar, V. J. S.; Zapatero Osorio, M. R.; Lodieu, N. +2 more
Aims: Our objective is the optical and near-infrared spectroscopic characterisation of 2MASS J0249-0557 c, a recently discovered young planetary mass companion to the β Pictoris (~25 Myr) member 2MASS J0249-0557.
Methods: Using the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey and the Two Micron All Sky Survey (2M…
Cluster Observations of Energetic Electron Acceleration Within Earthward Reconnection Jet and Associated Magnetic Flux Rope
Daly, P. W.; Vaivads, A.; Khotyaintsev, Yu. V. +3 more
We study acceleration of energetic electrons in an earthward plasma jet due to magnetic reconnection in the Earth magnetotail for one case observed by Cluster. The case has been selected based on the presence of high fluxes of energetic electrons, Cluster being in the burst mode and Cluster separation being around 1,000 km that is optimal for stud…
VVV survey near-infrared colour catalogue of known variable stars
Minniti, D.; Saito, R. K.; Catelan, M. +4 more
Context. The Vista Variables in the Via Lactea (VVV) near-infrared variability survey explores some of the most complex regions of the Milky Way bulge and disk in terms of high extinction and high crowding.
Aims: We add a new wavelength dimension to the optical information available at the American Association of Variable Star Observers Inter…
A tale of two tails: insights from simulations into the formation of the peculiar dwarf galaxy NGC 1427A
Peletier, R. F.; Mastropietro, M.; De Rijcke, S.
We present a scenario for the formation and the morphology of the arrow-shaped dwarf irregular galaxy NGC 1427A in the Fornax Cluster. This galaxy shows intriguing stellar and gaseous tails pointing in different directions for which alternative but not conclusive formation scenarios have been proposed in the literature. We performed N-body/SPH sim…
Using a Heliospheric Upwinding eXtrapolation (HUX) Technique to Magnetically Connect Different Regions of the Heliosphere
Riley, Pete; Issan, Opal
Understanding how coronal structure propagates and evolves from the Sun and into the heliosphere has been thoroughly explored using sophisticated MHD models. From these, we have a reasonably good working understanding of the dynamical processes that shape the formation and evolution of stream interaction regions and rarefactions, including their l…
Characterizing the X-Ray Emission of Intermediate-mass Pre-main-sequence Stars
Binder, Breanna A.; Townsley, Leisa K.; Broos, Patrick S. +2 more
We use X-ray and infrared observations to study the properties of three classes of young stars in the Carina Nebula: intermediate-mass (2-5 M⊙) pre-main-sequence stars (IMPS; i.e., intermediate-mass T Tauri stars), late-B and A stars on the zero-age main sequence (AB), and lower-mass T Tauri stars (TTS). We divide our sources among thes…
High Mach Number Quasi-Perpendicular Shocks: Spatial Versus Temporal Structure
Russell, C. T.; Omidi, N.; Howes, G. G. +1 more
Planetary bow shocks are a natural laboratory for investigating the physics of collisionless shocks. Given that spacecraft observations provide us with information regarding the temporal structure of the shock, often multi-spacecraft missions and kinetic simulations are needed to discern the nature of the dissipation processes at the shock and the…