Credit & Copyright: A. Hobart, CXC
Explanation:
In the center of a swirling whirlpool of hot gas
is likely a beast that has never been seen directly: a
black hole.
Studies of the bright light emitted by the
swirling gas frequently indicate not only that a
black hole is present, but also likely attributes.
The gas surrounding GRO J1655-40, for example, has been found to display an unusual flickering
at a rate of 450 times a second.
Given a
previous mass estimate for the central object of seven times the mass of our
Sun, the rate of the
fast flickering can be
explained by a black hole
that is rotating very rapidly.
What physical mechanisms actually cause the flickering -- and a slower quasi-periodic oscillation (QPO) -- in
accretion disks surrounding
black holes and
neutron stars remains a topic of much research.
News: APOD editor to speak in January in New York
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr' |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Publikacii s klyuchevymi slovami:
black hole - chernye dyry - Mercanie
Publikacii so slovami: black hole - chernye dyry - Mercanie | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> | |
