Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2022 February 22
The featured image is an illustration of an early quasar
showing an accretion disk surrounding a massive black hole
emanating a central jet.
Please see the explanation for more detailed information.

Illustration: An Early Quasar
Illustration Credit & License: ESO, M. Kornmesser

Explanation: What did the first quasars look like? The nearest quasars are now known to involve supermassive black holes in the centres of active galaxies. Gas and dust that falls toward a quasar glows brightly, sometimes outglowing the entire home galaxy. The quasars that formed in the first billion years of the universe are more mysterious, though. Featured, recent data has enabled an artist's impression of an early-universe quasar as it might have been: centred on a massive black hole, surrounded by sheets of gas and an accretion disk, and expelling a powerful jet. Quasars are among the most distant objects we see and give humanity unique information about the early and intervening universe. The oldest quasars currently known are seen at just short of redshift 8 -- only 700 million years after the Big Bang -- when the universe was only a few percent of its current age.

Tomorrow's picture: Green Orion


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