NGC 7456 is a spiral galaxy located over 51 million light-years away in the constellation Grus (The Crane). Hubble’s image of this galaxy shows its uneven spiral arms. The spiral arms are filled with young stars seen as patches of blue light. Around the arms are also clumps of dark dust. Still around the spiral arms, there are areas of new star formation.
These star-forming regions, known as nebulae, are the areas with a pink glow. In these regions, the young growing stars are hot, and the surroundings are rich in hydrogen gas. The emissions from the stars ionize the hydrogen gas, giving it the characteristic reddish-pink glow when viewed with space telescopes like Hubble.
The brightness seen around NGC 7456’s supermassive black hole in this image gives it an active galaxy status. Active galaxies are galaxies whose galactic nucleus emits tremendous radiation that produces a bright glow. This Hubble image also reveals distant galaxies, seen as small orange spots around NGC 7456.
While Hubble is able to capture in the visible, ultraviolet, and some infrared regions, X-ray activity is left out. However, ESA makes up for this with its XMM-Newton Satellite. Interestingly, this satellite has discovered small objects (ultraluminous X-ray sources) that emit powerful X-rays. Scientists are still trying to figure out what powers these mysterious objects.
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