Quite a lot has been going on:
How gravitational waves could reveal flaws in a black-hole theorem, satellites lead an
The famous no-hair theorem says that black holes can only be defined in terms of three properties: mass, charge and spin. It has held up pretty well for about 50 years, but now some physicists are hoping to find evidence of violations of the theorem in gravitational waves from merging black holes.
Earth imaging satellites provide a wide range of information about agriculture that is used by everyone from farmers to those who set food policies. In this episode Catherine Nakalembe of the University of Maryland in the US explains how satellite monitoring can help mitigate the effects of drought and other climate and land use variations.
Rare cosmic neutrino traced to star-shredding black hole | Science
Reflection of a Supermassive Black Hole Mesmerize Experts: NASA
(NASA) – This 2003 composite X-ray (blue and green) and optical (red) image of the active galaxy, NGC 1068, shows gas blowing away in a high-speed wind from the vicinity of a central supermassive black hole.
Regions of intense star formation in the inner spiral arms of the galaxy are highlighted by both optical and X-ray emission.
The elongated shape of the gas cloud is thought to be due to the funneling effect of a torus, or doughnut-shaped cloud, of cool gas and dust that surrounds the black hole.
Quite a lot has been going on:
Ultramassive black hole in NGC 1600 investigated in detail
The properties of the UMBH in NGC 1600, especially its huge mass and relatively close proximity , make it an excellent target for which spatially resolved temperature and density profiles can be obtained within the Bondi radius—a calculated radius of the region around the galaxy from which surrounding medium is likely to be drawn in and accreted. Hence, University of Alabama's James Runge and Stephen A. Walker decided to employ Chandra in order to conduct such study.
"Using new deep Chandra observations in conjunction with archival Chandra data of NGC 1600, we have determined the temperature and density profiles within the Bondi accretion radius, down to a radius of ∼0.16 kpc from the central ultramassive black hole," the researchers wrote in the paper.
An international team discovers the "heaviest black hole collision" might be a boson star merger
IMAGE: Artistic representation of a collision of two boson stars, together with the gravitational waves emitted. view more
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The hypothetical stars are among the simplest exotic compact objects proposed and constitute well founded dark matter candidates. Within this interpretation, the team is able to estimate the mass of a new particle constituent of these stars, an ultra-light boson with a mass billions of times smaller than that of the electron. Their analysis has been published in the journal Physical Review Letters on 24 February 2021.
'Ghostly' neutrino from star-shredding black hole reveals cosmic particle accelerator of epic
A ghostly particle that smashed into Antarctica in 2019 has been traced back to a black hole tearing apart a star while acting like a giant cosmic particle accelerator, a new study finds.
Neutrinos possess no electric charge and only rarely interact with other particles. As such, they can slip through matter easily — a light-year's worth of lead, equal to about 5.8 trillion miles (9.5 trillion kilometers) would only stop about half of the neutrinos flying through it.
Supermassive Black Holes Could Form from Dark Matter | Astronomy | Sci-News.com
Theoretical physicists from Italy, Spain and Argentina propose a new mechanism for the creation of supermassive black holes from dark matter.
Galaxy halos could harbor a very dense nucleus of dark matter, which may potentially mimic the effects of a central black hole, or eventually collapse to form one. Image credit: Sci-News.com.
Standard formation models involve normal baryonic matter collapsing under gravity to form black holes, which then grow over time.
Happening on Twitter
Astronomers recently linked another neutrino to an extragalactic source, this time from a black hole tearing apart… https://t.co/WiJpTf5TED NASAUniverse (from Greenbelt, MD) Wed Feb 24 17:00:35 +0000 2021
For only the second time, astronomers have linked an elusive particle called a high-energy neutrino to an object ou… https://t.co/ThjhwZjMYk NASA_Marshall (from Huntsville, Alabama USA) Tue Feb 23 14:11:00 +0000 2021
Scientists traced a tiny, lightweight particle traveling at near lightspeed, called a neutrino, to a black hole shr… https://t.co/npGNKynOjG NASAUniverse (from Greenbelt, MD) Mon Feb 22 17:12:18 +0000 2021
A black hole, despite the association with nothingness, is quite powerful. Using NASA's Neil Gehrels Swift Observat… https://t.co/Z7HfDwZEZ4 NASAGoddard (from Greenbelt, MD USA) Tue Feb 23 01:00:01 +0000 2021
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