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GRB 980425 host: [C II], [O I], and CO lines reveal recent enhancement of star formation due to atomic gas inflow
Le Floc'h, E.; Sollerman, J.; Hunt, L. K. +18 more
Context. Accretion of gas from the intergalactic medium is required to fuel star formation in galaxies. We have recently suggested that this process can be studied using host galaxies of gamma-ray bursts (GRBs).
Aims: Our aim is to test this possibility by studying in detail the properties of gas in the closest galaxy hosting a GRB (980425). …
Using ForeCAT Deflections and Rotations to Constrain the Early Evolution of CMEs
Vourlidas, A.; Kay, C.; Opher, M. +1 more
To accurately predict the space weather effects of the impacts of coronal mass ejection (CME) at Earth one must know if and when a CME will impact Earth and the CME parameters upon impact. In 2015 Kay et al. presented Forecasting a CME’s Altered Trajectory (ForeCAT), a model for CME deflections based on the magnetic forces from the background sola…
Herschel detects oxygen in the β Pictoris debris disk
Heras, A. M.; Walker, H. J.; Ivison, R. J. +28 more
The young star β Pictoris is well known for its dusty debris disk produced through collisional grinding of planetesimals, kilometre-sized bodies in orbit around the star. In addition to dust, small amounts of gas are also known to orbit the star; this gas is likely the result of vaporisation of violently colliding dust grains. The disk is seen edg…
Chain Reconnections Observed in Sympathetic Eruptions
Joshi, Navin Chandra; Magara, Tetsuya; Aulanier, Guillaume +2 more
The nature of various plausible causal links between sympathetic events is still a controversial issue. In this work, we present multiwavelength observations of sympathetic eruptions, associated flares, and coronal mass ejections (CMEs) occurring on 2013 November 17 in two close active regions. Two filaments, I.e., F1 and F2, are observed in betwe…
ALMA-resolved salt emission traces the chemical footprint and inner wind morphology of VY Canis Majoris
Smith, N.; Decin, L.; Richards, A. M. S. +6 more
Context. At the end of their lives, most stars lose a significant amount of mass through a stellar wind. The specific physical and chemical circumstances that lead to the onset of the stellar wind for cool luminous stars are not yet understood. Complex geometrical morphologies in the circumstellar envelopes prove that various dynamical and chemica…
Formation and X-ray emission from hot bubbles in planetary nebulae - II. Hot bubble X-ray emission
Toalá, J. A.; Arthur, S. J.
We present a study of the X-ray emission from numerical simulations of hot bubbles in planetary nebulae (PNe). High-resolution, two-dimensional, radiation-hydrodynamical simulations of the formation and evolution of hot bubbles in PNe, with and without thermal conduction, are used to calculate the X-ray emission and study its time-dependence and r…
The Milky Way's Hot Gas Kinematics: Signatures in Current and Future OVII Absorption Line Observations
Bregman, Joel N.; Miller, Matthew J.; Hodges-Kluck, Edmund J.
Detections of z ≈ 0 oxygen absorption and emission lines indicate the Milky Way hosts a hot (∼ {10}6 K), low-density plasma extending ≳ 50 {{kpc}} into the Mily Way’s halo. Current X-ray telescopes cannot resolve the line profiles, but the variation of their strengths on the sky constrains the radial gas distribution. Interpreting the O…
Deep HST/STIS Visible-light Imaging of Debris Systems around Solar Analog Hosts
Henning, Thomas; Stark, Christopher C.; Debes, John H. +11 more
We present new Hubble Space Telescope observations of three a priori known starlight-scattering circumstellar debris systems (CDSs) viewed at intermediate inclinations around nearby close-solar analog stars: HD 207129, HD 202628, and HD 202917. Each of these CDSs possesses ring-like components that are more massive analogs of our solar system's Ed…
Oxygen, neon, and iron X-ray absorption in the local interstellar medium
García, Javier A.; Kallman, Timothy R.; Gatuzz, Efraín +1 more
Aims: We present a detailed study of X-ray absorption in the local interstellar medium by analyzing the X-ray spectra of 24 galactic sources obtained with the Chandra High Energy Transmission Grating Spectrometer and the XMM-Newton Reflection Grating Spectrometer.
Methods: By modeling the continuum with a simple broken power-law and by i…
CLASH-VLT: Strangulation of cluster galaxies in MACS J0416.1-2403 as seen from their chemical enrichment
Grillo, C.; Balestra, I.; Rosati, P. +9 more
Aims: Environmental effects gain importance as large scale structures in the Universe develop with time and have become the dominant mechanism for quenching galaxies of intermediate and low stellar masses at lower redshifts. Therefore, clusters of galaxies at z< 0.5 are the sites where environmental effects are expected to be more pronounc…