Dark matter in accretion disks

被引：16

作者：

Howell, Steve B. ^{[1
]}

Hoard, D. W. ^{[2
]}

Brinkworth, C. ^{[2
]}

Kafka, S. ^{[2
]}

Walentosky, M. J. ^{[3
]}

Walter, Frederick M. ^{[4
]}

Rector, T. A. ^{[5
]}

机构：

[1] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[2] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[3] Oil City High Sch, Oil City, PA 16301 USA

[4] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[5] Univ Alaska, Dept Phys & Astron, Anchorage, AK 99508 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 685卷 / 01期

关键词：

accretion; accretion disks; quasars : general; stars : dwarf novae;

D O I：

10.1086/590491

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 mu m 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 mu m spherical particles with a density of 3 g cm(-3) 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.

引用

页码：418 / 427

页数：10

共 36 条

[21] Mass determination and detection of the onset of chromospheric activity for the substellar object in EF Eridani [J].