File: Messier 83 Deep Field Showing Stellar Halo and Northern Tidal Stream.png
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Summary
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English: This deep exposure of the barred spiral galaxy Messier 83 (the Southern Pinwheel) was created from nearly 70 hours of integration time. The image reveals the large, faint stellar halo extending far beyond the bright spiral structure, including sections of the northern tidal stream. This stream appears at the 10 o’clock position, curves outside the field of view, and re-enters near the 2 o’clock position behind the prominent blue foreground star.
The bright spiral disk is rich in colourful detail, with numerous red H II regions enhanced by 4.25 hours of H-alpha exposure. Complex, swirling dust lanes trace the spiral structure and converge into a chaotic central region surrounding the warm, luminous nucleus. To the east of Messier 83 lie the small background galaxies PGC 724525 and PGC 48132. Although far more distant, they show intriguing morphological features and the upper galaxy displays several distinct tidal tails Near the top right of the field is the faint dwarf galaxy dw1335-29, confirmed in 2018 to be a satellite of Messier 83. Messier 83 is classified as an intermediate between a normal and a barred spiral galaxy. Located in the southern constellation Hydra at a distance of roughly 15 million light-years, it is one of the showpieces of the southern sky and is commonly known as the “Southern Pinwheel.” M83 is a classic example of a grand-design spiral galaxy, with strongly defined arms containing many pink emission nebulae—sites of active star formation—and blue clusters of recently formed massive stars. Between the spiral arms lie regions of lower stellar density, while pronounced dust lanes follow the spiral pattern and can be traced all the way into the central bar and nucleus. The nucleus itself is dominated by an older yellow stellar population. The spiral arms do not rotate as rigid structures. Instead, they represent regions of higher density within the disk, consistent with density wave theory. The concentration of bright blue supergiant stars along the leading edges of the arms indicates where star formation is actively triggered as gas clouds move through these denser regions. These hot, short-lived stars illuminate the arms but die before they travel far from them, helping to preserve the luminous spiral pattern over time. Many distant background galaxies are visible throughout the field, some several billion light-years away and reddened by cosmological redshift due to the expansion of the Universe. Image details
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| Source | Own work |
| Author | Hwy37 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:11, 10 December 2025 | | 3,293 × 2,479 (14.18 MB) | wikimediacommons>Hwy37 | Uploaded own work with UploadWizard |
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