Astronomers using the NASA/ESA Hubble Space Telescope have unveiled a stunning new image of the dwarf starburst galaxy NGC 4449, located approximately 12.5 million light-years away in the constellation Canes Venatici. This galaxy, also known as Caldwell 21 or LEDA 40973, spans around 20,000 light-years across and was discovered by the German-born British astronomer William Herschel on April 27, 1788.
NGC 4449 is part of the M94 galaxy group, closely associated with the Local Group that contains the Milky Way. Described by Hubble astronomers as a dwarf galaxy, NGC 4449 is significantly smaller and contains fewer stars than our own galaxy. However, its small size belies its impressive capabilities; it is currently forming new stars at a rate much higher than what is typically expected for a galaxy of its size, earning it the designation of a starburst galaxy. Unlike most starburst galaxies that primarily create stars in their central regions, NGC 4449 has bright young stars distributed throughout its entirety.
Astronomers believe that the current star formation surge in NGC 4449 is influenced by its interactions with nearby galaxies, offering a valuable opportunity for Hubble to study how these interactions can impact star formation. The new color image captures data collected using Hubble’s Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) across ultraviolet, near-infrared, and optical wavelengths, employing seven different filters to sample various light spectra.
The previously released Hubble image of NGC 4449 dates back to 2007, but this updated version includes additional wavelengths gathered from multiple observing programs. These programs aim to explore a wide array of scientific inquiries, from a detailed examination of NGC 4449’s history of star formation to mapping the brightest, hottest, and most massive stars in over two dozen neighboring galaxies.
Original Source: https://www.sci.news/astronomy/hubble-image-ngc-4449-13988.html
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Publish Date: 2025-06-16 20:31:00
