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NGC 7090 (Spiral Galaxy)


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NGC 7090
Spiral Galaxy (渦巻銀河)
Gx SBc

別名 (Other names)
PGC 67045, ESO 188-12, AM 2133-544

明るさ (Brightness)
10.7等級

星座 (Constellation)
インディアン座 (Ind) (Indus)


距離 (Distance)
3,000万光年 (30 million light-years)

NGC 7090 is a spiral galaxy located 30 million light years from the Earth in the constellation Indus.

NGC 7090 (Spiral Galaxy) : Picture

NGC 7090
Spiral Galaxy NGC 7090
(C) NASA/ESA
This image portrays a beautiful view of the galaxy NGC 7090, as seen by the NASA/ESA Hubble Space Telescope. The galaxy is viewed edge-on from the Earth, meaning we cannot easily see the spiral arms, which are full of young, hot stars.

However, a side-on view shows the galaxy’s disc and the bulging central core, where typically a large group of cool old stars are packed in a compact, spheroidal region. In addition, there are two interesting features present in the image that are worth mentioning.

First, we are able to distinguish an intricate pattern of pinkish red regions over the whole galaxy. This indicates the presence of clouds of hydrogen gas. These structures trace the location of ongoing star formation, visual confirmation of recent studies that classify NGC 7090 as an actively star-forming galaxy.

Second, we observe dust lanes, depicted as dark regions inside the disc of the galaxy. In NGC 7090, these regions are mostly located in lower half of the galaxy, showing an intricate filamentary structure. Looking from the outside in through the whole disc, the light emitted from the bright center of the galaxy is absorbed by the dust, silhouetting the dusty regions against the bright light in the background.

Dust in our galaxy, the Milky Way, has been one of the worst enemies of observational astronomers for decades. But this does not mean that these regions are only blind spots in the sky. At near-infrared wavelengths — slightly longer wavelengths than visible light — this dust is largely transparent and astronomers are able to study what is really behind it. At still longer wavelengths, the realm of radio astronomy, the dust itself can actually be observed, letting astronomers study the structure and properties of dust clouds and their relationship with star formation.

NGC 7090
Spiral Galaxy NGC 7090
(C) NASA/ESA
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NGC 7090 (Spiral Galaxy) : Movie

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