Science, Space and Technology News 2023
New reserarch has revealed that quasars, the bright centers of galaxies, can be hidden by the very galaxies they inhabit. This contradicts the old belief that a quasar’s glow is only dimmed by a surrounding dust ring, shedding new light on the evolution of galaxies and their central black holes.
Illustration of the sources of obscuration. Orange clouds represent the dust and gas close to the central black hole, and blue clouds with stars represent the dust and gas in the galaxy forming the stars. The gradient in the blue color represents the amount of gas and dust in the galaxy, from little to large amount of gas and dust. Credit: Durham University, they observed a sample of very dusty quasars with intense rates of star formation.
In such galaxies, clouds of gas and dust stirred up by rapid star formation can pile up and completely hide the quasar.Lead author of the study Carolina Andonie, PhD student in the Centre for Extragalactic Astronomy at Durham University, said: “It’s like the quasar is buried in its host galaxy.black hole“This phenomenon only seems to happen when the quasar is undergoing an intense growth spurt.”
Study co-author Professor David Alexander of Durham University said: “It’s a turbulent, messy phase of evolution, when gas and stars collide and cluster in the galaxy’s center.Unveiling these buried quasars will help scientists understand the connection between galaxies and the supermassive black holes at their hearts.
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