跳转到内容

File:Molecular Torus Surrounds Black Hole.jpg

页面内容不支持其他语言。
这个文件来自维基共享资源
维基百科,自由的百科全书

原始文件 (3,072 × 2,304像素,文件大小:1.08 MB,MIME类型:image/jpeg


摘要

描述
English: Why do some black hole surroundings appear brighter than others? In the centers of active galaxies, supermassive black holes at least thousands of times the mass of our Sun dominate. Many, called Seyfert Type I, are very bright in visible light. Others, called Seyfert Type II, are rather dim. The difference might be caused by some black holes accreting much more matter than others. Alternatively, the black holes in the center of Seyfert Type II galaxies might be obscured by a surrounding torus. To help choose between these competing hypotheses, the nearby Seyfert II galaxy NGC 4388 has been observed in X-ray light recently by many recent Earth-orbiting X-ray observatories, including CGRO, SIGMA, BeppoSAX, INTEGRAL, Chandra, and XMM-Newton. Recent data from INTEGRAL and XMM-Newton have found that the X-ray flux in some X-ray colors varies rapidly, while flux in other X-ray colors is quite steady. The constant flux and apparent absorption of very specific X-ray colors by cool iron together give evidence that the central black hole in NGC 4388 is seen through a thick torus composed of molecular gas and dust.
日期
来源 https://apod.nasa.gov/apod/ap040908.html
作者 V. Beckmann (NASA's GSFC) et al., ESA

许可协议

Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
警告:

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描绘内容

image/jpeg

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2023年11月11日 (六) 20:182023年11月11日 (六) 20:18版本的缩略图3,072 × 2,304(1.08 MB)Юрий Д.К.Uploaded a work by V. Beckmann (NASA's GSFC) et al., ESA from https://apod.nasa.gov/apod/ap040908.html with UploadWizard

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

元数据