Hubble Examines Low Brightness, High Interest Galaxy

• Hubble Space Telescope has captured an image of the spiral galaxy NGC 45, which lies just 22 million light-years away in the constellation Cetus.
• The galaxy is a low surface brightness galaxy, meaning it appears fainter than the night sky itself due to having relatively few stars for its volume of gas and dark matter.
• Studying these hard-to-detect galaxies is key to understanding how galaxies form and evolve, and Hubble’s sensitive instruments are well-suited for the task.
• The image was created using data from two complementary observing programs that examined star formation in nearby galaxies, including NGC 45.
• The study of low surface brightness galaxies like NGC 45 can provide valuable insights into the formation and evolution of galaxies, making Hubble’s observations a significant contribution to our understanding of the universe.

This NASA/ESA Hubble Space Telescope image zooms in on the feathery spiral arms of the galaxy NGC 45, which lies just 22 million light-years away in the constellation Cetus (the Whale).

The portrait uses data drawn from two complementary observing programs. The first took a broad view of 50 nearby galaxies, leveraging Hubble’s ability to observe ultraviolet through visible into near-infrared light to study star formation in these galaxies. The second program examined many of the same nearby galaxies as the first, narrowing in on a particular wavelength of red light called H-alpha. Star-forming nebulae are powerful producers of H-alpha light, and several of these regions are visible across NGC 45 as bright pink-red patches.

These observing programs aimed to study star formation in galaxies of different sizes, structures, and degrees of isolation — and NGC 45 is a particularly interesting target. Though it may appear to be a regular spiral galaxy, NGC 45 is a remarkable type called a low surface brightness galaxy.

Low surface brightness galaxies are fainter than the night sky itself, making them incredibly difficult to detect. They appear unexpectedly faint because they have relatively few stars for the volume of gas and dark matter they carry. In the decades since astronomers serendipitously discovered the first low surface brightness galaxy in 1986, researchers have learned that 30–60% of all galaxies may fall into this category. Studying these hard-to-detect galaxies is key to understanding how galaxies form and evolve, and Hubble’s sensitive instruments are equal to the task.

Text Credit: ESA/Hubble

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