Herbig-harrows are luminous regions surrounding young stars. They form when stellar winds or jets of gas ejected from these stars create shock waves that collide at high speeds with nearby gas and dust.
The James Webb Space Telescope captured a high-resolution image of HH 211, a bipolar jet moving through interstellar space at supersonic speeds. The object, located about a thousand light-years from Earth in the Perseus group, is one of the youngest and closest protostellar jets, making it an ideal target for Webb.
A close-up, high-resolution AA Webb look at Herbig-Haro 211 reveals excellent details of the young star's jet.
Credit: ESA/Webb, NASA, CSA, Tom Ray (Dublin)
Herbig-harrows are luminous regions surrounding young stars. They form when stellar winds or jets of gas ejected from these stars create shock waves that collide at high speeds with nearby gas and dust. This image of HH 211 taken by NASA's James Webb Space Telescope reveals a jet from a Type 0 protostar, a childhood counterpart of our Sun when it was no more than a few tens of thousands of years old and only 8% the mass of today's Sun. (It will eventually grow of a thing to a star like the sun).
AA imaging is particularly effective in studying young stars and their jets, because these stars are in any case still inside the gas from the molecular cloud in which they formed. The AA emission from the star's jets penetrates the obscuring gas and dust, so Webb's sensitive AA instruments are ideal for viewing in Herbig-Harrow objects such as HH 211. Molecules excited by the turbulent conditions, including hydrogen, carbon monoxide and silicon Molecular monoxides, emit light AA that Schwebb can collect to map the structure of the jets.
The image shows a series of arc shock waves in the southeast (bottom left) and northwest (top right) and also the narrow bipolar jet that drives them. Webb reveals this scene in unprecedented detail – the spatial resolution is about five to ten times higher than any previous images of HH 211. The inner jet appears to "oscillate" in mirror symmetry on either side of the protostar. This is suitable for smaller scale observations and is enhanced by the fact that the progenitor is actually possibly a binary star.
Previous observations of HH 211 using ground-based telescopes have revealed giant arcuate shock waves moving away from us (northwest) and approaching us (southeast) and cavity-like structures in hydrogen and carbon monoxide, respectively, that have been traversed by both a shock wave and an entangled and oscillating dipole jet in mono-silicon Oxidized. Researchers used Webb's new observations to determine that the object's jet is relatively slow compared to more evolved protostars with similar types of jets.
The team measured and found that the velocities of the structures of the innermost jet are about 80 to 100 kilometers per second. But, the difference in speed between these parts of the jet and the leading material they collide with – the shock wave – is much smaller. The researchers concluded that jets from the youngest stars, like this at the center of HH 211, are mainly composed of molecules, because the relatively low speeds of the shock waves do not have enough energy to break the molecules into simple atoms and ions more
More of the topic in Hayadan:
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Eli
The meaning is that the movement of the particles moving from the star is faster than the speed of propagation of vibrations in the medium (which is actually the speed of sound). This is analogous to the waves created in the exhaust gases of a jet (or rocket) engine.
Who is really the amateur? 🙂
The topic itself is fascinating.
It seems that the author tried to translate a scientific article from English to Hebrew and added his own personal touch or so
There is AI in action here :-)
What does sound have to do with space? Who is this amateur?