James-Webb reveals the composition of the gas around a supermassive black hole

Stephan’s Quintet, a visual grouping of five galaxies located in the constellation Pegasus, was among the first images chosen to illustrate the power of the James-Webb Space Telescope in comparison to its predecessor, Hubble. But JWST not only makes it possible to take lavish images, it also performs spectroscopic analyzes that reveal the chemical composition of stars and astrophysical environments. We see an example with one of the supermassive black holes associated with the Stephan quintet galaxies.

James-Webb is still only at the beginning of its observations, and it is already producing spectacular results. We even wonder if he is not giving us elements to decide the theory of dark matter in the Mond theory of cosmology.

While we wait to find out, let us be patient as we note certain results that have already been achieved, such as those concerning the famous The Stephan Quintet, a visual grouping of five galaxies located in the constellation Pegasus, but of which only four are truly gravitationally associated, the fifth galaxy simply foregrounding the other four. This last gate NGC number 7320 among them New general catalog of nebulae and Clusters of stars or NGC — in French “New General Catalog of fogs and piles ofstars », which we initially owe to John Louis Emil Dreyer (1852 – 1926), a astronomer Irish-Danish.

Ghosts speak of the black hole environment of NGC 7319

With JWST is astrophysicists focused on the case of NGC 7319, which harbors an active galactic nucleus, ifenergy light equivalent to 40 billion sun coming from a supermassive black hole of 24 million solar masses — ours The Milky Way contains a Srg A*just over 4 million solar masses.

For their curriculum they trusted spectrometer to medium solution (MRS), which is part of the mid-infrared instrument (Miri) by James-Webb. The MRS contains an imager and a spectrographwhich made it possible to observe and make measurements regarding gas closer to the central black hole in NGC 7319 than ever before. The instrument revealed that the black hole was shrouded in silicate dust, the composition of which is similar true of beach, but much smaller in size than grains of sand.

By them spectra was shown in the image above.

The spectrum in the upper part shows a region filled with hot and ionized gases, especially containing ironof’argonfrom neonfrom sulphur and offoxygenas indicated by the peaks at wavelengths data. The presence of several lines ofdischarge of the same element, with different degrees ofionizationis valuable for understanding the properties and origin of plasma flows around the black hole.

The spectrum of the lower part, meanwhile, reveals that the supermassive black hole is associated with a cooler and denser reservoir of high-abundance gashydrogen molecular and silicate dust which absorbs light central regions of the galaxy.

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