The Event Horizon Telescope Collaboration (EHT) has released new images of the supermassive black hole at the centre of the galaxy Messier 87. Researchers from Aalto University and the University of Turku contributed to forming the images from the new observations.
An international team of astronomers observed the second one of the two supermassive black holes circling each other in an active galaxy OJ 287.
In the latest issue of the journal Nature, an international team including astronomers from University of Turku reveal the origin of a thermonuclear supernova explosion. Strong emission lines of helium and the first detection of such a supernova in radio waves show that the exploding white dwarf star had a helium-rich companion.
When neutron stars collide, they produce a violent explosion. Data from the only well observed collision show that the explosion was perfectly spherical, completely contrary to expectations. How this is possible remains a mystery, but the discovery may provide a new key to fundamental physics and to measuring the age of the Universe. The discovery was made by an international collaboration led by astrophysicists from the University of Copenhagen and including researchers from the University of Turku. The research has just been published in the journal Nature.
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 the University of Turku found that the axis of rotation of a black hole in a binary system is tilted more than 40 degrees relative to the axis of stellar orbit. The finding challenges current theoretical models of black hole formation.
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.
Astro-polarimetry is an important method in astronomical observation, aimed at detecting and measuring polarisation of light emitted, reflected, or scattered by astronomical objects such as asteroids, planets, nebulae, stars and exoplanets. The astro-polamiter built with the lead of a research group from the University of Turku made its first observations in July 2019 at the Nordic Optical Telescope on the Canary Islands. In October 2019, the University of Turku becomes the joint owner of the Telescope.