Star Formation in Dwarf Galaxy Leo P
Star Formation in Dwarf Galaxy Leo P
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This James Webb Space Telescope image shows a portion of the Leo P dwarf galaxy, with its stars appearing in blue at the lower right. Located about 5 million light-years away in the constellation Leo, Leo P is a rare example of a small galaxy that resumed star formation after a long pause. By analyzing data from roughly 15,000 stars, scientists determined that Leo P experienced an initial burst of star formation, followed by a multi-billion-year lull, and is now forming stars again.
Captured by Webb’s NIRCam instrument, the image combines infrared wavelengths of 0.9 microns (blue), 1.5 microns (green), and 2.77 microns (red). Leo P’s stars appear especially blue due to their youth, high mass, and the galaxy’s extreme lack of heavier elements—conditions that favor the formation of “metal-poor” stars that tend to be bluer than Sun-like stars. Near the bottom center, a glowing bubble reveals ionized hydrogen gas surrounding a hot, massive O-type star.
Image courtesy of NASA, ESA/Webb
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