IC342 - The Largest Maffei Group Spiral

Face on Spiral in Camelepodarus

Uploaded 10/10/05

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 The Maffei Group of galaxies marks the outermost boundries of the Local Group of Galaxies which includes our own, the Andromenda Galaxy and a few dozen smaller members. This galaxy, which is about half the size of our own Milky Way Galaxy, lies in a region of the sky with extreme dust absorbtion. So dense is the dust in this part of the sky, the Maffei galaxies nearby are dimmed over 6 magnitudes and rendered extremely reddish. IC342 is suffering from the same fate, the galaxy normally photograhs as a deep brownish yellow coloration, and the blue of the spiral arms is all but filtered out. This image has been histogram equalized to bring back the original appearance as best as I could, a new technique being popularized by myself and Don Goldman.

This low surface brightness face on SAB class spiral has an integrated magnitude of 9.1, spread out over an area of nearly half a degree. Radial velocity measurements have shown that this galaxy is tilted 1 degree to our line of sight. This galaxy is rich in lovely pink HII regions. Litterally hundreds can be seen here, the pink coloration is the result of a combination of red H-alpha and blue H-beta radiation, the color here derived from the original LRGB image.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: SBIG ST4 Exposure: L+HaRGB = 120:20:20:20 (RGB Binned 2x2) RGB Combine Ratio: 1: 1.05: 1.11 Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 5.0 arcsec (Maxim DL - 10min subframe), Transparency 6/10 Outside Temperature: 60 F CCD Temperature: -30 C Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, CCDOps Debloomer. HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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