Extract from NASA
The Horsehead Nebula, imaged by the NIRCam instrument on NASA’s Webb Telescope, features a portion of the horse’s “mane” about 0.8 light-years wide. The blue clouds at the bottom of the image are dominated by cold, molecular hydrogen. Red wisps above the nebula represent mainly atomic hydrogen gas.
The mid-infrared instrument (MIRI), managed through launch by NASA-JPL, helped reveal for the first time the small-scale structures of the nebula’s edge.
NASA’s James Webb Space Telescope has captured the sharpest infrared images to date of a zoomed-in portion of one of the most distinctive objects in our skies, the Horsehead Nebula. These observations show the top of the “horse’s mane,” or edge of this iconic nebula, in a whole new light, capturing the region’s complexity with unprecedented spatial resolution.
The “mane” of the Horsehead Nebula is shown here imaged by Webb’s MIRI instrument. The mid-infrared light captured by MIRI reveals substances like dusty silicates and soot-like molecules called polycyclic aromatic hydrocarbons.
Webb’s new images show part of the sky in the constellation Orion (“The Hunter”), in the western side of a dense region known as the Orion B molecular cloud. Rising from turbulent waves of dust and gas is the Horsehead Nebula, otherwise known as Barnard 33, which resides roughly 1,300 light-years away.
The nebula formed from a collapsing interstellar cloud of material and glows because it is illuminated by a nearby hot star. The gas clouds surrounding the Horsehead have already dissipated, but the jutting pillar is made of thick clumps of material and therefore is harder to erode. Astronomers estimate that the Horsehead has about 5 million years left before it, too, disintegrates. Webb’s new view focuses on the illuminated edge of the top of the nebula’s distinctive dust and gas structure.
The Horsehead Nebula is a well-known photodissociation region, or PDR. In such a region, ultraviolet (UV) light from young, massive stars creates a mostly neutral, warm area of gas and dust between the fully ionized gas surrounding the massive stars and the clouds in which they are born. This UV radiation strongly influences the chemistry of these regions and acts as a significant source of heat.
These regions occur where interstellar gas is dense enough to remain mostly neutral, but not dense enough to prevent the penetration of UV light from massive stars. The light emitted from such PDRs provides a unique tool to study the physical and chemical processes that drive the evolution of interstellar matter in our galaxy, and throughout the universe from the early era of vigorous star formation to the present day.
Due to its proximity and its nearly edge-on geometry, the Horsehead Nebula is an ideal target for astronomers to study the physical structures of PDRs and the molecular evolution of the gas and dust within their respective environments, and the transition regions between them. It is considered one of the best regions in the sky to study how radiation interacts with interstellar matter.
The “mane” of the Horsehead Nebula is shown here imaged by Webb’s MIRI instrument. The mid-infrared light captured by MIRI reveals substances like dusty silicates and soot-like molecules called polycyclic aromatic hydrocarbons.
Thanks to Webb’s MIRI and NIRCam instruments, an international team of astronomers has revealed for the first time the small-scale structures of the illuminated edge of the Horsehead. As UV light evaporates the dust cloud, dust particles are swept out away from the cloud, carried with the heated gas. Webb has detected a network of thin features tracing this movement. The observations have also allowed astronomers to investigate how the dust blocks and emits light, and to better understand the multidimensional shape of the nebula.
Next, astronomers intend to study the spectroscopic data that has been obtained to gain insights into the evolution of the physical and chemical properties of the material observed across the nebula.
Get the Latest From the Final Frontier
These observations were taken in the Webb GTO program 1192, and the results were published today in Astronomy & Astrophysics.
More About the Mission
The James Webb Space Telescope is the world's premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and the Canadian Space Agency.
MIRI was developed through a 50-50 partnership between NASA and ESA. JPL led the U.S. efforts for MIRI, and a multinational consortium of European astronomical institutes contributes for ESA. George Rieke with the University of Arizona is the MIRI science team lead. Gillian Wright is the MIRI European principal investigator.
The MIRI cryocooler development was led and managed by JPL, in collaboration with Northrop Grumman in Redondo Beach, California, and NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
No comments:
Post a Comment