Archiv: black holes (space phenomenon) / Schwarze Löcher

25.10.2021 - 18:59 [ National Aeronautics and Space Administration ]

Studying the Edge of the Sun’s Magnetic Bubble

(Oct 19, 2021)

The space radiation that comes at us from other stars is called galactic cosmic radiation (GCR). Active areas in the galaxy – like supernovae, black holes, and neutron stars – can strip the electrons from atoms and accelerate the nuclei to almost the speed of light, producing GCR.

On Earth, we have three layers of protection from space radiation. The first is the heliosphere, which helps block GCR from reaching the major planets in the solar system. Additionally, Earth’s magnetic field produces a shield called the magnetosphere, which keeps GCR out away from Earth and low-orbiting satellites like the International Space Station. Finally, the gases of Earth’s atmosphere absorb radiation.

29.06.2021 - 21:31 [ BBC ]

Rare black hole and neutron star collisions sighted twice in 10 days

When objects as massive as these collide they create ripples in the fabric of space called gravitational waves. And it is these ripples that the researchers have detected.

06.10.2020 - 14:00 [ ]

Forschung zu Schwarzen Löchern: Deutscher erhält Physik-Nobelpreis

Der Nobelpreis für Physik geht in diesem Jahr zur einen Hälfte an Roger Penrose aus Großbritannien sowie zur anderen Hälfte an den Deutschen Reinhard Genzel und die US-Amerikanerin Andrea Ghez für ihre Forschungen zu Schwarzen Löchern. Das teilte die Königlich-Schwedische Akademie der Wissenschaften in Stockholm mit.

15.11.2019 - 18:07 [ Tuan Do, Astronomer at UCLA ‏/ Twitter ]

Here’s a timelapse of images over 2.5 hr from May from @keckobservatory of the supermassive black hole Sgr A*. The black hole is always variable, but this was the brightest we’ve seen in the infrared so far. It was probably even brighter before we started observing that night!

15.11.2019 - 18:04 [ ]

Unprecedented variability of Sgr A* in NIR


The electromagnetic counterpart to the Galactic center supermassive black hole, Sgr A*, has been observed in the near-infrared for over 20 years and is known to be highly variable. We report new Keck Telescope observations showing that Sgr A* reached much brighter flux levels in 2019 than ever measured at near-infrared wavelengths. In the K$^\prime$ band, Sgr A* reached flux levels of $\sim6$ mJy, twice the level of the previously observed peak flux from $>13,000$ measurements over 130 nights with the VLT and Keck Telescopes. We also observe a factor of 75 change in flux over a 2-hour time span with no obvious color changes between 1.6 $\mu$m and 2.1 $\mu$m.

15.11.2019 - 18:00 [ ]

Milky Way’s Black Hole Just Flared, Growing 75 Times as Bright for a Few Hours


Even though the black hole at the center of the Milky Way is a monster, it’s still rather quiet. Called Sagittarius A*, it’s about 4.6 million times more massive than our Sun. Usually, it’s a brooding behemoth. But scientists observing Sgr. A* with the Keck Telescope just watched as its brightness bloomed to over 75 times normal for a few hours.

15.11.2019 - 17:58 [ ]

Something Weird Is Happening to the Black Hole at the Center of the Milky Way


Astronomers have been watching the black hole at the center of our galaxy for 20 years, and in May, they saw something they’d never seen before.

15.11.2019 - 17:47 [ ]

The large-scale ionization cones in the Galaxy


Our time-dependent Seyfert flare models adequately explain the observations and indicate the Seyfert flare event took place T_o = 3.5 +/- 1 Myr ago.

15.11.2019 - 17:32 [ ]

Something in The Centre of Our Galaxy Colossally Erupted 3.5 Million Years Ago


In 2013, astrophysicist Joss Bland-Hawthorn of the University of Sydney and the ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) and colleagues estimated that the event occurred between 1 and 3 million years ago.

Now, more observations taken using the Hubble Space Telescope – and therefore a bigger dataset – have provided even more compelling evidence for the event. And the team has been able to narrow down a timeframe for both when the event occurred, as well as its duration.

15.11.2019 - 17:29 [ ]

Fossil imprint of a powerful flare at the Galactic Centre along the Magellanic Stream


Thus it is likely that the Stream emission arose from a `Seyfert flare‘ that was active 1-3 Myr ago, consistent with the cosmic ray lifetime in the Fermi bubbles. Sgr A* activity today is greatly suppressed (70-80 dB) relative to the Seyfert outburst…

15.11.2019 - 17:16 [ Forbes ]

The Milky Way’s Supermassive Black Hole Erupted Two Million Years Ago


The key the astronomers found was actually discovered 20 years old, in the form of a strange glow that astronomers had noticed in the Magellanic Stream. The Magellanic Stream is composed of large clouds of gas – mostly hydrogen – that stretch for light years in the wake of the Milky Way’s two companion Galaxies, the Large and Small Magellanic Clouds. The Stream is about 2 billion years old.

„We didn’t understand the cause. Then suddenly we realised it must be the mark, the fossil record, of a huge outburst of energy from the centre of our Galaxy,“ remarked researcher Joss Bland-Hawthorn in a press release.

15.11.2019 - 15:49 [ European Southern Observatory (ESO) / Youtube ]

Zooming into Sagittarius A*


ESO’s exquisitely sensitive GRAVITY instrument has added further evidence to the long-standing assumption that a supermassive black hole lurks in the centre of the Milky Way. New observations show clumps of gas swirling around at about 30% of the speed of light on a circular orbit just outside a four million solar mass black hole — the first time material has been observed orbiting close to the point of no return, and the most detailed observations yet of material orbiting this close to a black hole.

15.11.2019 - 15:31 [ Carnegie Science / Youtube ]

Hypervelocity star


The artist impression of the ejection mechanism by the supermassive black hole. Credit: James Josephides (Swinburne Astronomy Productions)

15.11.2019 - 15:21 [ Carnegie Science ]

Runaway star was ejected from the “heart of darkness”

“My favorite part of this discovery is thinking about where this star came from and where it’s going,” said Ji. “It was born in one of the craziest places in the universe, near a supermassive black hole with lots of other nearby star friends; but it’s going to leave our galaxy and die all alone, out in the middle of nowhere. Quite a fall from grace.”

15.11.2019 - 15:06 [ CBS News ]

Supermassive black hole throws star out of Milky Way galaxy at speed of 3.7 million mph

Five million years ago, when humanity’s ancestors were just learning to walk upright, a star was ejected from Sagittarius A*, the supermassive black hole at the center of the Milky Way Galaxy, at a staggering 3.7 million mph. This month, a group of researchers spotted the superfast star traveling relatively close to Earth.

13.07.2019 - 22:05 [ ]

Russia launches space telescope

Russia launched a space telescope Saturday from the cosmodrome in Baikonur, Kazakhstan, a joint project with Germany intended to replace one it lost in January.

30.05.2019 - 16:24 [ ]

Solving a century-long mystery: the origin of galactic cosmic rays


The word ‘astronomy’ means the direct observations of extra-terrestrial objects. This definition is relevant to photons, neutrinos, and gravitational waves, i.e. massless, neutral and stable particles. But for cosmic ray electrons, protons, and nuclei, the term ‘astronomy’ is used with a certain reservation. Because of the deflections of electrically charged particles in the chaotic interstellar and intergalactic magnetic fields, the information about their original directions pointing to the sites of their production is lost. Instead, on the Earth, we detect an (almost) isotropic flux of cosmic rays contributed by a huge number of galactic and extragalactic sources.

12.04.2019 - 18:19 [ Nature News & Comment ‏/ Twitter ]

Dr. Katie Bouman, who led the creation of an algorithm that helped capture the first ever image of a black hole, tells us what this breakthrough means for science ?‍? #EHTBlackHole #BlackHole

14.07.2018 - 16:25 [ New York Times ]

It Came From a Black Hole, and Landed in Antarctica

For the first time, astronomers followed cosmic neutrinos into the fire-spitting heart of a supermassive blazar.

14.07.2018 - 16:24 [ TUMuenchen1 / Youtube ]

IceCube Neutrino Telescope Detects Origin of Extragalactic Particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

14.07.2018 - 15:41 [ IceCube Neutrino Observatory at Amundsen–Scott South Pole Station ]

IceCube neutrinos point to long-sought cosmic ray accelerator

An international team of scientists has found the first evidence of a source of high-energy cosmic neutrinos, ghostly subatomic particles that can travel unhindered for billions of light years from the most extreme environments in the universe to Earth.

The observations, made by the IceCube Neutrino Observatory at the Amundsen–Scott South Pole Station and confirmed by telescopes around the globe and in Earth’s orbit, help resolve a more than a century-old riddle about what sends subatomic particles such as neutrinos and cosmic rays speeding through the universe.

14.07.2018 - 15:32 [ ]

Scientists capture mysterious ‘ghost particle’ in a giant ice cube in ‘triumph’ that changes how we see the universe

Scientists have captured a ghost-like subatomic particle on Earth, helping to solve a mystery baffling scientists for 100 years.

The so-called “ghost particle” was trapped by researchers in a giant ice cube at the South Pole.

It’s actually a high-energy neutrino, and is the first of its type ever detected by scientists.

Importantly, researchers believe they’ve tracked its likely source: a supermassive black hole that emits light and cosmic rays.