Browsing by Subject "accretion, accretion disks"

Now showing items 1-7 of 7

    • Detection of rest-frame optical lines from x-shooter spectroscopy of weak emission-line quasars 
      Plotkin, Richard; Shemmer, Ohad; Trakhtenbrot, Benny; Anderson, Scott; Brandt, W.; Fan, Xiaohui; Gallo, Elena; Lira Teillery, Paulina; Luo, Bin; Richards, Gordon; Schneider, Donald; Strauss, Michael; Wu, Jianfeng (The American Astronomical Society, 2015-06-01)
      Over the past 15 yr, examples of exotic radio-quiet quasars with intrinsically weak or absent broad emission line regions (BELRs) have emerged from large-scale spectroscopic sky surveys. Here, we present spectroscopy ...
    • The impact of bound stellar orbits and general relativity on the temporal behavior of tidal disruption flares. 
      Dai, Lixin; Escala Astorquiza, Andrés; Coppi, Paolo (The American Astronomical Society, 2013-09-20)
      We have carried out general relativistic particle simulations of stars tidally disrupted by massive black holes. When a star is disrupted in a bound orbit with moderate eccentricity instead of a parabolic orbit, the ...
    • The inner environment of Z Canis Majoris: High-contrast imaging polarimetry with NaCo 
      Canovas, H.; Pérez, Sebastián; Dougados, C.; de Boer, J.; Ménard, Francois; Casassus Montero, Simón; Schreiber, M. R.; Cieza, L. A.; Caceres, C.; Girard, J. H. (EDP SCIENCES, 2015)
      Context. Z CMa is a binary composed of an embedded Herbig Be and an FU Ori class star separated by ∼100 au. Observational evidence indicates a complex environment in which each star has a circumstellar disk and drives a ...
    • Outflow-confined H II regions. I. First signposts of massive star formation 
      Tanaka, Kei; Tan, Jonathan; Zhang, Yichen (IOP PUBLISHING, 2016)
      We present an evolutionary sequence of models of the photoionized disk-wind outflow around forming massive stars based on the Core Accretion model. The outflow is expected to be the first structure to be ionized by the ...
    • PIC Simulations of Velocity-space Instabilities in a Decreasing Magnetic Field: Viscosity and Thermal Conduction 
      Riquelme, Mario; Quataert, Eliot; Verscharen, Daniel (Institute of Physics Publishing, 2018)
      We use particle-in-cell (PIC) simulations of a collisionless, electron–ion plasma with a decreasing background magnetic field, B, to study the effect of velocity-space instabilities on the viscous heating and thermal ...
    • Protoplanetary Disks Including Radiative Feedback from Accreting Planets 
      Montecinos Armijo, Matías; Cuadra, Jorge; Pérez, Sebastián; Baruteau, C.; Casassus Montero, Simón (The American Astronomical Society, 2015)
      While recent observational progress is converging on the detection of compact regions of thermal emission due to embedded protoplanets, further theoretical predictions are needed to understand the response of a ...
    • Stochastic Ion Acceleration by the Ion-cyclotron Instability in a Growing Magnetic Field 
      Ley, Francisco; Riquelme, Mario; Sironi, Lorenzo; Verscharen, Daniel; Sandoval, Astor (Institute of Physics Publishing, 2019)
      © 2019 Institute of Physics Publishing. All rights reserved.Using 1D and 2D particle-in-cell simulations of a plasma with a growing magnetic field B, we show that ions can be stochastically accelerated by the ion-cyclotron ...