An international team of astronomers observed the second one of the two supermassive black holes circling each other in an active galaxy OJ 287.
Keyword: black hole
A new study sheds light on the bright outbursts of radiation that are created when a star is destroyed by a supermassive black hole. The outbursts do not necessarily form in the close vicinity of the black hole, but are created by tidal shocks that occur when gas from the destroyed star hits itself while circling the black hole.
Astronomers receive ERC Synergy Grant to make colour movies of black holes and build new telescope in Africa
The European Research Council (ERC) has awarded a Synergy Grant, named “BlackHolistic”, of 14 million Euro to a team of Dutch, British, Finnish, and Namibian astronomers to make colour movies of black holes. Researchers from the University of Turku are involved in international collaboration.
Some of the brightest objects in the sky are called blazars. They consist of a supermassive black hole feeding off material swirling around it in a disk, which can create two powerful jets perpendicular to the disk on each side. A blazar is especially bright because one of its jets of high-speed particles points straight at Earth. For decades, scientists have wondered: How do particles in these jets get accelerated to such high energies?
The researchers observed the X-ray radiation from the matter around a black hole. According to the researchers the shape and orientation of the X-ray glow support the theory, that the X-rays come from the disc-shaped material flowing into the black hole which is perpendicular to previously imaged relativistic outflows of matter called jets. These findings give a better understanding about the inner workings of black holes and how they consume mass.
Researchers from Aalto University, the University of Turku and the Finnish Centre for Astronomy with ESO were part of the international research group in taking a revolutionary picture.
Radio observations made by Metsähovi, Finland’s only astronomical radio observatory, and Caltech's Owens Valley Radio Observatory (OVRO) in California have revealed that radiation from the remote PKS 2131-021 quasar is subject to periodic variation. Researchers at the University of Turku participated in the analysis of the observational data.
Observations of the centres of galaxies reveal the hidden destruction of stars by lurking supermassive black holes (Dissertation defence Nov 4 2021, MSc Thomas Reynolds, astronomy)
We know that in the centres of the majority of galaxies lies a supermassive black hole. New observations of certain galaxies reveal that these black holes may be consuming stars at a higher rate than previously known. The energy produced by the destruction of the star can be revealed in the infrared, as heat from cosmic dust warmed by the explosion.
Polarization of Light Helps to Better Understand Emission Sources in the Vicinity of Stellar-Mass Black Holes (Dissertation Defence, MSc Ilia Kosenkov, 8 Oct 2021, Astronomy)
Stellar-mass black holes that are part of binary systems sometimes show variable polarization of optical emission. The degree, angle and variability pattern of polarization is characteristic of the physical processes occurring in the vicinity of a black hole. By studying black holes astronomers learn how matter and energy behave under extreme conditions.
An international team of astronomers has used the optical HiPERCAM camera of the Gran Telescopio Canarias in La Palma and NASA’s NICER X-ray observatory aboard the International Space Station to create a video of a growing black hole system at an unprecedented level of detail. The study has increased scientific understanding on the immediate surroundings of black holes.