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The black hole of the Milky Way bursts unexpectedly, a distant black hole catches hiccups, and a fresh analysis of LIGO's data shows the first "black hole" of the black hole.
The central black hole of the Milky Way illuminates
Tuan Do (UCLA) and his colleagues took an unprecedented momentum in the light of gas just outside the central black hole of our galaxy, Sgr A *.
The rise was reflected in infrared images taken last spring with the Keck II telescope in Maunakea, as part of the ongoing monitoring of Sgr A * by the UCLA Galactic Center Group. The increase is twice as bright as anything observed since the black hole since the first time astronomers detected variations of its light in 2003. It is therefore difficult to reconcile as a random blip.
It may be that Sgr A * consumes an extra amount of hot gas, perhaps left out by the consequences of the proximity of the S2 star in 2018 or the G2 dusty object in 2014. L & # The team continues to monitor the black hole to see if the activity continues to grow.
The result appears in September 10th Letters from the Astrophysical Journal.
Astronomers "hear" early agreement on Black Hole merger
A reanalysis of the first detection of gravitational waves by LIGO reveals that scientists can capture the thrill in the space-time that follows a black hole melting.
Two black holes are preparing to blend in with the illustration of this artist.
<Em? LIGO / Caltech / MIT / Aurore Simonnet (State of Sonoma)
This thrill, called the ringdown, is like the last vibration of a bell struck. Physicists had generally searched for the ringing signal long after a merger, but graduate students Matthew Giesler (Caltech), Maximiliano Isi (MIT) and their colleagues had discovered that the ring could be detected immediately. The key they found, is to look for marks, like additional tones in the ringtone.
The researchers calculated the mass and effects of the black hole on the basis of the ring and its harmonics. They confirmed that these two parameters encompass everything you need to know about an astrophysical black hole, an idea known as theorem without hair.
The team reports the results in upcoming articles in Letters of physical examination (preprint available here) and Physical examination X (preprint available here).
Far black hole has hiccups
X-ray observations from the center of the far galaxy GSN 069 revealed semi-regular black hole explosions.
The black hole in the center of galaxy GSN 069 emits semi-regular (inset) X-ray eruptions.
X-Ray: NASA / CXO / CSIC-INTA / G.Miniutti et al .; Optics: DSS
In 2010, astronomers had noticed signs of tidal disturbance, in which the black hole tears a star in two. The X-ray glow resulting from this event faded until Giovanni Miniutti (Center for Astrobiology, Spain) and his colleagues witnessed a series of explosions between December 2018 and February 2019. Observations show radiological eruptions lasting approximately one hour and repeating each time. nine o'clock.
Observers have very few cases in which they observed similar behavior from giant black holes. However, the team thinks that September 11 Nature that astronomers may have glimpsed this behavior on much longer time scales in other black holes and did not recognize it. Why does hiccup happen?
Read a behind-the-scenes blog from Miniutti.
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