James Webb’s New Discovery in the Perseus Constellation – Cedar News

  • Tech
  • November 29, 2023

Thanks to the James Webb Space Telescope (JWST), astronomers have discovered a bright, faint system surrounding a newborn star in a “cradle” of gas and dust.

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The astronomical object “Herbic Harrow 797” (HH 797) is located near the young open star cluster IC 348, about 1,000 light-years from Earth in the Perseus constellation.

According to NASA, herbic-harrow materials are bright regions around newborn stars and are formed when gas jets ejected by protostars collide at high speeds with nearby clouds of dust and gas, causing shock waves. A star is born at high speed.

HH 797, visible in the lower half of the new James Webb image, was spotted by scientists using the telescope’s Near Infrared Camera (NIRCam) instrument.

Infrared instruments such as NIRCam are ideal for studying young stars and investigating Harrow objects because these cosmic objects are often surrounded by remnants of gas and dust that form early on, which absorb and block other wavelengths of light emitted by these stars.

By looking at a newborn star with NIRCam, the James Webb telescope revealed particles heated to thousands of degrees as a result of collisions, allowing astronomers to determine the structures emerging from newborn stars.

HH 797 has been studied extensively by ground-based telescopes, and previous observations have shown that its gas is moving away from Earth, causing its wavelength to be stretched, or “red-shifted,” to its south, while the gas to its north is “blue-shifted,” indicating that it is moving toward Earth. .

Astronomers have found that the gas on the eastern edge of HH 797 is redder than the gas on the western edge.

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Previously, scientists believed that HH 797 originated from a newborn star, however in a new image obtained by James Webb, the object was seen to have nearly parallel jets, each causing its own series of shocks. … This explains the asymmetry in gas velocities around HH 797.

The source of these twin jets is located in a small dark area visible in the lower right part of the image. This indicates that this region contains two stars instead of one, each ejecting its own gas jet.

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