Tag: quasar

Supermassive Black Holes Formed in Rare Regions of Gas Behind the Earliest Quasars: Study

Scientists have managed to determine one of the biggest mysteries in recent astrophysics – the formation of quasars in the early universe. These cosmic entities were first spotted in 2003, and soon after, over 200 quasars were identified by supermassive black holes. These 200 quasars had formed within the first billion years after the formation of the universe. Scientists had never managed to conclusively determine how these quasars formed so early in the universe. Now, a team of researchers has found out that these primordial quasars naturally formed in chaotic conditions of rare gas reservoirs of the early universe.

“The first supermassive black holes were simply a natural consequence of structure formation in cold dark matter cosmologies – children of the cosmic web,” said Dr Daniel Whalen from the University of Portsmouth.

Dr Whalen led the team of researchers behind the study that determined the origin of the quasars. The study was published on July 6 in the Nature.

The researchers used a supercomputer model to run simulations about where these quasars could form. Scientists found that the quasars managed to form when supermassive black holes, with a mass at least 1,00,000 times that of our Sun, in areas of space where cold powerful streams of gasses were found in strong concentrations. These gaseous streams were only found in about a dozen or so regions across a region of space 1 billion light-years across.

“Consequently, the only primordial clouds that could form a quasar just after cosmic dawn — when the first stars in the universe formed — also conveniently created their own massive seeds. This simple, beautiful result not only explains the origin of the first quasars but also their demographics – their numbers at early times,” Dr Whalen said.

Quasars are some of the most powerful and energetic objects in the universe. Found in the centre of distant galaxies, quasars are powered by supermassive black holes whose mass ranges from millions to tens of billions of solar masses. These black holes accrete nearby matter that heats up due to friction and pressure as they fall towards the black hole. The heat and electromagnetic energy created in this way are then released by the quasars in the form of electromagnetic energy.

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Fastest-Growing Black Hole in the Universe, 7,000 Times Brighter Than the Entire Milky Way

Scientists have discovered the fastest-growing black hole in the last 9 billion years. The black hole, which sends multi-wavelength light blazing across the universe, shines 7,000 times brighter than the entire Milky Way galaxy. Due to this, it is also known as a quasar. For those who don’t know, quasars are one of the brightest objects in the universe. When supermassive black holes emit matter at a high rate, the end result is a quasar. Scientists, who have analysed its properties, have named it SMSS J114447.77-430859.3 (J1144 for short).

As per the analysis, light from the black hole has travelled almost 7 billion years to reach Earth. The mass of this supermassive black hole is around 2.6 billion times the mass of the Sun. In fact, material equivalent to the mass of Earth falls into this black hole every second.

The team’s research has been submitted to the Publications of the Astronomical Society of Australia. We would like to add that this black hole went unnoticed by scientists to date. As the position is concerned, it sits 18 degrees above the galactic plane. Whereas, in the previous surveys, it was found that the position is 20 degrees above the Milky Way disk.

Astronomer Christopher Onken from the Australian National University said, “Astronomers have been hunting for objects like this for more than 50 years. They have found thousands of fainter ones, but this astonishingly bright one had slipped through unnoticed.”

According to Onken and his team, this black hole is a “very large, unexpected needle in the haystack”.

Professor Christian Wolf, who is a co-author, said, “We are fairly confident this record will not be broken. We have essentially run out of the sky where objects like this could be hiding.”

As a result of this discovery, scientists are more enthusiastic to hunt down other bright quasars. Right now, there are 80 new quasars as confirmed by the team of scientists.

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