Multispectral Imaging of Messier 83

This seven-filter image of Messier 83, also known as the Southern Pinwheel Galaxy, reveals structural and energetic features that are not apparent in visual observation alone. By combining broadband and narrowband data, the image provides a more comprehensive view of the galaxy’s morphology, stellar populations, and ionized gas.

Filter Contributions

·       Luminance (Clear): Captures the full signal across the visible spectrum, enhancing fine structure and faint background detail.

·       Red, Green, and Blue (RGB): Reconstruct the galaxy’s natural color, distinguishing older yellow stellar populations in the core from younger blue stars in the spiral arms.

·       Hydrogen-Alpha: Isolates emission from ionized hydrogen at 656.28 nm, highlighting active star-forming regions as bright red and pink nebular clouds.

·       Oxygen-III: Captures emission from doubly ionized oxygen at 496–501 nm, improving contrast and revealing faint nebular structure.

·       Sulfur-II: Isolates emission from singly ionized sulfur near 672.4 nm, helping trace hot gas and shock-related features.

Together, these filters provide a layered scientific view of Messier 83’s structure, star-forming activity, and energetic processes.

Galaxy Overview

Messier 83 is a barred spiral galaxy located approximately 15 million light-years from Earth near the boundary between Hydra and Centaurus. Its nearly face-on orientation provides an especially clear view of the prominent central bar and well-defined spiral arms.

Star Formation Activity

M83 is classified as a starburst galaxy, undergoing periods of unusually intense star formation. Its spiral arms contain extensive hydrogen emission regions that mark active stellar nurseries, where large populations of young stars are forming. Stellar winds from these young stars reshape the surrounding gas and dust and contribute to the galaxy’s ongoing evolution.

Supernovae and Nuclear Activity

The same elevated rate of star formation also results in frequent stellar death. Astronomers have recorded six supernovae in M83 over the past century, making it one of the most prolific nearby galaxies for such events. These explosions disperse heavy elements into the interstellar medium, enriching the material from which future stars and planetary systems may form. Infrared observations, including data from the James Webb Space Telescope, also indicate the possible presence of a heavily obscured supermassive black hole in the galaxy’s core.

Discovery and Observational Context

Nicolas-Louis de Lacaille discovered M83 in 1752 at the Cape of Good Hope, and Charles Messier later included it in his catalog in 1781 as its southernmost galaxy. Today, M83 remains a widely observed target for amateur astronomers. With an apparent magnitude of approximately 7.5 to 7.6, it appears as a bright, diffuse patch in binoculars, while observers in the Southern Hemisphere can resolve more of its spiral structure with modest telescopes.

Imaging Summary

This image was acquired at Observatorio El Sauce in Chile using a PlaneWave CDK 24 telescope and a Moravian C5 and SBIG 16803 cameras. Data was collected through LRGB, H-alpha, O III, and S II filters.

 ·       Luminance: 1,200 minutes

·       Green: 906 minutes

·       Red: 915 minutes

·       Blue: 1,170 minutes

·       H-alpha: 1,050 minutes

·       O III: 1,050 minutes

·       S II: 1,050 minutes

Total integration time: 123 hours.

 SOWS Group members: Mazlin, Forman, Magill, Hanson, and Parker

 Enjoy,

Mark

Messier 83 "The Colorful Cosmos Series Begins"

M 83 Located some 15 million light-years away in the constellation of Hydra (The Sea Serpent) is one of the highlights of the Southern sky, often referred to as the Southern Pinwheel. It’s one of the largest and closest barred spirals galaxies to us.  It has hosted many supernova explosions. At least six (likely 7)of these were observed supernovae and nearly 300 supernovae remnants.

Its center is mysterious and unusual; the supermassive black hole at its heart is not alone. This striking galaxy displays a phenomenon known as a double nucleus. The double Nucleus does not mean it has 2 black holes but rather a single supermassive black hole with a large lopsided disk of stars orbiting which makes it look like dual nucleus.

M 83 has a "bar" of stars slicing through its center, leading to its classification as a barred spiral. Our own Milky Way also belongs to this category as well. These bars are thought to act a bit like a Chanel, funneling gas inwards towards the galaxy's core. This gas is then used to form new stars that feed the galaxy's black hole.

Here we see the Hydrogen channel only Where the detail Is quite different from the color channels. This was continuum subtracted from the red channel to give a much more realistic view.

Image Processing and Calibration: Mark Hanson, Alexandr Zaytsev

24" Planewave CDK f6.5 and L600 Mount, Camera SBIG 16803 Location: SWOS, El Sauce Chile

Data Collection: Hanson, Mazlin, Parker, Forman 2023

 Enjoy,

Mark

You can see the new video here:

Messier 83 From 1 Meter

One of the highlights of the Southern sky, M83 is often referred to as the Southern Pinwheel.

 It is a colorful barred spiral starburst galaxy located only 15 million light years away in Hydra.

M83 has an unusual double nucleus and houses a super massive black hole at its center apparently surrounded by an asymmetric disc of stars. It has also been the home of at least six observed supernovae and nearly 300 supernovae remnants have been identified.

 Imaged in LRGB and H alpha on our PlaneWave CDK 1000 at Observatorio El Sauce, Chile.

 Image Processing: Mike Selby and Mark Hanson

Enjoy, Mark and Mike