Black holes

The galaxies SDSS J1354+1327 and SDSS J1354+1328 (Image NASA , ESA, and J. Comerford (University of Colorado-Boulder))

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An article published in “The Astrophysical Journal” describes the observation of two events consisting of a supermassive black hole that swallowed large amounts of gas and then emits a part of them in the form of very high-energy jets. A team of astronomers led by Julie Comerford of the University of Colorado at Boulder used observations made with various telescopes to capture this repeated activity at the center of a galaxy known as SDSS J1354+1327 or simply J1354.

The galaxy UGC 6093 (Image ESA/Hubble & NASA)

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A photo of the galaxy UGC 6093 taken by the Hubble Space Telescope shows some of its interesting features. It’s a barred spiral galaxy, it has an active galactic nucleus powered by a supermassive black hole at its center and acts like a megamaser, which is an astronomical maser that emits microwaves with an intensity about 100 million times greater than that of the astronomical masers found in galaxies such as the Milky Way.

Scenarios after the kilonova (Image NRAO/AUI/NSF: D. Berry)

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An article published in the journal “Nature” describes a research on the consequences of the merger between two neutron stars observed in the emission of both electromagnetic and gravitational waves. A team of researchers led by Kunal Mooley of the US National Radio Astronomy Observatory (NRAO) used the Very Large Array (VLA) together with the Australia Telescope Compact Array and the Giant Metrewave Radio Telescope in India for three months from the beginning of September to detect the radio waves emitted by the event at the origin of the gravitational waves recorded on August 17, 2017 in the event labeled as GW170817.

Cygni V404 during its outburst (Image Andrew Beardmore (Univ. of Leicester) and NASA/Swift)

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An article published in the journal “Science” describes a precise measurement of the magnetic field of the corona of the black hole V404 Cygni. A team of researchers used the data collected in 2015 during a violent outburst of energy connected to the emission of jets from the black hole detected at many wavelengths using various space and ground-based telescopes. The result of this measurement was very surprising, being about 400 times lower than previous estimates.