SIMBAD references

2008ApJ...685..418H - Astrophys. J., 685, 418-427 (2008/September-3)

``Dark matter'' in accretion disks.

HOWELL S.B., HOARD D.W., BRINKWORTH C., KAFKA S., WALENTOSKY M.J., WALTER F.M. and RECTOR T.A.

Abstract (from CDS):

Using Spitzer Space Telescope photometric observations of the eclipsing, interacting binary WZ Sge, we have discovered that the accretion disk is far more complex than previously believed. Our 4.5 and 8 µm time series observations reveal that the well-known gaseous accretion disk is surrounded by an asymmetric disk of dusty material with a radius approximately 15 times larger than the gaseous disk. This dust ring contains only a small amount of mass and is completely invisible at optical and near-IR wavelengths, hence consisting of ``dark matter.'' We have produced a model dust ring using 1 µm spherical particles with a density of 3 g/cm3 and with a temperature profile ranging from 700 to 1500 K. Our discovery about the accretion disk structure and the presence of a larger, outer dust ring have great relevance for accretion disks in general, including those in other interacting binary systems, pre-main-sequence stars, and active galaxies.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Galaxies: Quasars: General - Stars: Dwarf Novae

Simbad objects: 8

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2021.06.15-19:43:25

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