'Accretion disks' presentation slideshows

AST3021 Lecture 01

Lecture 1. AST3021. Accretion disks. AST3021 Lecture 01. Huge accretion disks (AGNs). Accretion disk + Black Hole in the core of elliptical galaxy NGC 4261 (Hubble Space Telescope).

580 views • 42 slides

Studies of the MRI with a New Godunov Scheme for MHD:

Studies of the MRI with a New Godunov Scheme for MHD:. Jim Stone & Tom Gardiner Princeton University. Recent collaborators: John Hawley (UVa) Peter Teuben (UMd). Outline of Talk. Motivation Basic Elements of the Algorithm Some Tests & Applications Evolution of vortices in disks

491 views • 38 slides

Global Simulations of Time Variabilities in Magnetized Accretion Disks

Global Simulations of Time Variabilities in Magnetized Accretion Disks. Ryoji Matsumoto (Chiba Univ.) Mami Machida (NAOJ). Rapid Time Variability of Cyg X-1. -0.9. ???. f. -1.5. f. 1Hz. 100Hz. Power Spectral Density (PSD) of Time Variation in Cyg X-1. X-ray Flux (Negoro 1995).

414 views • 32 slides

Gravitationally Unstable Accretion Disks

Gravitationally Unstable Accretion Disks. Roman Rafikov (Princeton). Gravitational Instability. Outline. Evidence for the gravitationally unstable disks Gravitoturbulence vs fragmentation Properties of gravitoturbulent disks Constraints on fragmentation Applications

478 views • 28 slides

Global MHD Simulations of Sawtooth-like Oscillations in Black Hole Accretion Disks

Global MHD Simulations of Sawtooth-like Oscillations in Black Hole Accretion Disks. Ryoji Matsumoto (Chiba Univ.) Mami Machida (NAOJ). X-ray Flares in Black Hole Candidates. -0.9. ???. f. -1.5. f. X-ray shots. 1Hz. 100Hz. Power Density Spectrum of Time Variation in Cyg X-1.

478 views • 27 slides

Woong-Tae Kim (Harvard-Smithsonian CfA)

Magnetorotationally-Driven. Turbulence. in Astrophysical Disks. Woong-Tae Kim (Harvard-Smithsonian CfA). Disks Are Common!. Solid Disks Planetary rings Accretion Disks Protostellar disks Disks in CVs Disks in AGN Galactic Disks. Disks Are Common!. Solid Disks Planetary rings

434 views • 24 slides

Quenching of the accretion disk strong aperiodic variability at the magnetospheric boundary

Quenching of the accretion disk strong aperiodic variability at the magnetospheric boundary. Reference: astro-ph/0909.2996v1. M. Revnivtsev, E. Churazov, K.Postnov, S. Tsygankov. Changsheng Shi. 2009.9.29. Abstract. Introduction. Truncated accretion disks in different classes of sources.

294 views • 21 slides

Stellar Remnants

Stellar Remnants. Stellar Remnants White Dwarfs. Discovery for White Dwarfs The first white dwarf was discovered when the star Sirius (the Dog Star) was suspected to have an unseen binary companion in 1850.

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QUASARS AND GALACTIC NUCLEI, A HALF-CENTURY STORY: or the invasion of Massive Black Holes

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What do we know about accretion disk structure at R < 1 pc?

The Accretion Disk Structures Black Hole Masses and Cosmic Distances The New Radio Universe. Lincoln Greenhill (Harvard-Smithsonian CfA). What do we know about accretion disk structure at R < 1 pc? What do disks tell us about BHs and AGN? What do disks have to do with distances?.

212 views • 20 slides

Hantao Ji Princeton Plasma Physics Laboratory

Hantao Ji Princeton Plasma Physics Laboratory. Experimentalist Laboratory astrophysics Reconnection, angular momentum transport, dynamo effect… Center for Magnetic Self-organization (CMSO, a NSF Physics Frontier Center) Current main research projects (>~10%)

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183 views • 15 slides

Observations vs Theory

JETS AND TORI IN PROTO-PNE. Observations vs Theory. Patrick Huggins New York University. Outline: two questions. Part I. Observations: Are jets and tori related ? examine time domain find evidence for a torus-jet sequence

278 views • 14 slides

Massive Star Formation

331 views • 12 slides

Emission Nebulae

Emission Nebulae. By: Paul Jones and Antione Henderson. Characteristics. They are usually high in temperature with a red glow from a large amount of hydrogen. They are sites of recent and on going star formation & because of this the hydrogen atoms seem to be mostly ionized.

194 views • 6 slides