79 research outputs found

    Structure, mass and stability of galactic disks

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    In this review I concentrate on three areas related to structure of disks in spiral galaxies. First I will review the work on structure, kinematics and dynamics of stellar disks. Next I will review the progress in the area of flaring of HI layers. These subjects are relevant for the presence of dark matter and lead to the conclusion that disk are in general not `maximal', have lower M/L ratios than previously suspected and are locally stable w.r.t. Toomre's Q criterion for local stability. I will end with a few words on `truncations' in stellar disks.Comment: Invited review at "Galaxies and their Masks" for Ken Freeman's 70-th birthday, Sossusvlei, Namibia, April 2010. A version with high-res. figures is available at http://www.astro.rug.nl/~vdkruit/jea3/homepage/Namibiachapter.pd

    A universal power-law prescription for variability from synthetic images of black hole accretion flows

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    Instrumentatio

    First sagittarius A* Event Horizon Telescope results. VI. Testing the black hole metric

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    Galaxie

    First sagittarius A* Event Horizon Telescope results. IV. Variability, morphology, and black hole mass

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    Galaxie

    Millimeter light curves of sagittarius A* observed during the 2017 Event Horizon Telescope campaign

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    Galaxie

    Characterizing and mitigating intraday variability: reconstructing source structure in accreting black holes with mm-VLBI

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    Instrumentatio

    First Sagittarius A* Event Horizon Telescope results. I. The shadow of the supermassive black hole in the center of the Milky Way

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    Galaxie

    First Sagittarius A* event horizon telescope results. II. EHT and multiwavelength observations, data processing, and calibration

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    Instrumentatio

    Broadband multi-wavelength properties of M87 during the 2017 Event Horizon Telescope campaign

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    High Energy AstrophysicsInstrumentatio
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