Hubble’s image of Herbig–Haro objects HH 1 and HH 2, formed by jets from young stars, reveals dynamic motion and structure in stellar nurseries.
The lives of newborn stars are tempestuous, as this stunning image of the Herbig–Haro objects HH 1 and HH 2 from the Hubble Space Telescope depicts. Both of these objects lie approximately 1250 light-years from Earth in the constellation Orion. HH 1 is the luminous cloud above the bright star in the upper right of this image, while HH 2 is the cloud in the bottom left.
Although both Herbig–Haro objects are visible in this image, the young star system responsible for their creation is lurking out of sight. It is swaddled in the thick clouds of dust at the center of this image. However, an outflow of gas from one of these stars can be seen streaming out from the central dark cloud as a bright jet. Meanwhile, the bright star between that jet and the HH 1 cloud was once thought to be the source of these jets, but it is now known to be an unrelated double star that formed nearby.
Herbig–Haro objects are glowing clumps found around some newborn stars, and are created when jets of gas thrown outwards from these young stars collide with surrounding gas and dust at incredibly high speeds. In 2002, NASA/ESA Hubble Space Telescope observations revealed that parts of HH 1 are moving at more than 400 kilometers per second (250 miles per second) or 1,400,000 km per hour (900,000 mph)!
This scene from a turbulent stellar nursery was captured with Hubble’s Wide Field Camera 3 (WFC3) using 11 different filters at infrared, visible, and ultraviolet wavelengths. Each of these filters is sensitive to just a small slice of the electromagnetic spectrum, and they allow astronomers to pinpoint interesting processes that emit light at specific wavelengths.
In the case of HH 1/2, two groups of astronomers requested Hubble observations for two different studies. The first delved into the structure and motion of the Herbig–Haro objects visible in this image, giving astronomers a better understanding of the physical processes occurring when outflows from young stars collide with surrounding gas and dust. The second study instead investigated the outflows themselves to lay the groundwork for future observations with the NASA/ESA/CSA James Webb Space Telescope. Webb, with its ability to peer past the clouds of dust enveloping young stars, will revolutionize the study of outflows from young stars.
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