Telescope is needed to view the objects.
Quasars emit light waves, radio waves and x-rays.
Quasars are super massive black hole surrounded by the disk like structured gas. It attracts galaxies, gas and stars with its gravity and these objects are sucked into the black hole resulting in the massive collision and radiating light and energy, this collision results in flares which is a distinct characteristic of quasars.
NASA’s Hubble Space Telescope has captured images of the short lived ghosts of quasars that flickered into life and fade away.
They are thin, green objects and bright masses of light and energy.
In 2007, the first green object was discovered by the by Dutch schoolteacher Hanny van Arkel.
The ethereal wisps which are glowing outside the galaxy are believed to be illuminated by the ultraviolet radiation emitted by the black hole which lies in the center of the galaxy.
Quasars are the most active of theses galaxy cores and any material fallen under the gravity are heated to a point where brilliant light shine into the space. This light is produced by the superheated gas encircling the black hole.
“However, the quasars are not bright enough now to account for what we’re seeing; this is a record of something that happened in the past,” said Bill Keel of the University of Alabama at Tuscaloosa, who initiated the Hubble investigation of the distant objects.
The behavior of the galaxies having energetic core is very puzzling and these images throw some light on it. The quasars once emitted huge energy, which they shouldn’t and this is indicated by the glowing filaments. One justification is quasars may be co-orbiting black holes and this may act like a dimmer switch.