NGC 4707 in Canes Venatici: Spiral Galaxy Type Sm | Hubble

NGC 4707 in Canes Venatici: Spiral Galaxy Type Sm | Hubble

On a clear evening in April 1789, the renowned astronomer William Herschel continued his unrelenting survey of the night sky, hunting for new cosmic objects—and found cause to celebrate! Lengthening his impressive list of cosmic discoveries yet again, the astronomer spotted this bright spiral galaxy, named NGC 4707, lurking in the constellation of Canes Venatici (the Hunting Dogs). NGC 4707 lies roughly 22 million light-years from Earth.

Over two centuries later, the Hubble Space Telescope is able to view the same galaxy in far greater detail than Herschel could, allowing us to appreciate the intricacies and characteristics of NGC 4707 as never before. This striking image comprises observations from Hubble’s Advanced Camera for Surveys (ACS), one of a handful of high-resolution instruments currently aboard the space telescope.

Herschel himself reportedly described NGC 4707 as a “small, stellar” galaxy; while it is classified as a spiral (type Sm), its overall shape, center, and spiral arms are very loose and undefined, and its central bulge is either very small or non-existent. It instead appears as a rough sprinkling of stars and bright flashes of blue on a dark canvas.

Magellanic spiral galaxies, classified as type Sm, are typically dwarf galaxies with a single spiral arm, named after their prototype, the Large Magellanic Cloud. They are considered intermediate between dwarf spiral galaxies and irregular galaxies. Sm galaxies are often disrupted and asymmetric, and they can be further categorized into types Sm, SAm, SBm, and SABm, depending on their structure and characteristics.

The blue smudges seen across the frame highlight regions of recent or ongoing star formation with newborn stars glowing in bright, intense shades of cyan and turquoise.

Image Credit: ESA/Hubble & NASA
Release Date: Dec. 19, 2016

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