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 with that of its predecessor, Hubble. But the JWST not only makes it possible to take sumptuous images, it also performs spectroscopic analyzes revealing the chemical composition of stars and astrophysical environments. We see an example with one of the supermassive black holes associated with the galaxies of the Stephan Quintet.
The James-Webb is still only at the very beginning of its observations and it is already giving spectacular results. We even wonder if he is not providing us with elements to decide
While waiting to find out, let’s be patient while taking note of certain results already obtained, such as those concerning the famousa visual grouping of five galaxies located in the constellation Pegasus but of which only four are truly gravitationally associated, the fifth galaxy being simply in the foreground of the other four. This last NGC number 7320 among the New general catalog of nebulae and stars or NGC — in French “New general catalog of and piles of », which we owe initially to John Louis Emil Dreyer (1852 – 1926), a Irish-Danish
Specters talk about the environment of the black hole of NGC 7319
With the JWST, thefocused on the case of NGC 7319 which houses an active galactic nucleus whose light equivalent to 40 billion comes from a supermassive black hole of 24 million solar masses — our contains one, just over 4 million solar masses.
For their curriculum, they relied on theto medium (MRS) which is part of the mid-infrared instrument ( ) of the James-Webb. MRS contains an imager and a which made it possible to observe and take measurements concerning the closer to the central black hole of NGC 7319 than ever before. The instrument revealed that the black hole was shrouded in silicate dust whose composition is similar to the of beach but much smaller in size than grains of sand.
Of themwere shown in the image above.
The spectrum in the upper part shows a region filled with hot and ionized gases, notably containingof the’ from from and of the as indicated by the peaks at data. The presence of several lines of of the same element, with different degrees of is valuable for understanding the properties and origins of plasma flows around the black hole.
The spectrum of the lower part reveals, meanwhile, that the supermassive black hole is associated with a cooler and denser reservoir of gas with large amounts ofmolecular and silicate dust which absorbs the central regions of the galaxy.