NGC6822 "Barnards Galaxy"

Enhanced Hydrogen Comparison

Uploaded 8/19/07

Standard RGB image Select an image size for a larger view: 1024 x 768 1600 x 1200
RGB Hydrogen Enhanced Select an image size for a larger view: 1024 x 768 1600 x 1200

This enigmatic object very much resembles its type galaxy, the Large Magellenic Cloud. Spanning 16 arcminutes in size, this galaxy has an integrated magnitude of 9.3 and is classed as an IB(s)m type. On its northern end at the top, we can see a host of emission objects including small bubbles of hydrogen. The brightest and by far most interesting is the pair on the upper right, MCG-2-50-2, 3. The large bubble is listed as 1.1 arcminutes and 14.2 magnitude in Megastar. Inside you can see the hot blue star that excites it.

The Enhanced Hydrogen image on the right dramatically reveals the dynamic process of star formation are still active in this Local Group outlier. Half a dozen bubbles of ionized hydrogen glow many of them with hot blue stars in their very centers. The two nebulosities to the upper right, MCG-2-50-2, 3 are spectacular in deep hydrogen and show many internal details in the largest images. It has only been in recent years that such detail can be photographed by small amateur telescopes such as this.

This part of the sky is still strongly influenced by the dust of the Sagittarius core region. Once the brown veil of dust was equalized out, the true colors of the stars and galaxy came out beautifully. This image is the start of a series which will include more hydrogen data as the skies permit.

Processing notes:

The image on the left is a standard unbinned RGB set, with full color resolution. About 2h of additional Ha data was taken the next night, and combined with the technique I will be going into detail about at the next AIC conference. Essentially, the Ha data was combined and then the R channel subtracted to remove the stars. The result is an image of the nebula only, which was then screened in Photoshop over the R,G,B data at 100%, 10% and 5% to produce the perfect pink Hydrogen mix.

Instrument: 12.5" f/5 Home made Newtonian Mount: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: Meade DSI Pro w/Lumicon Newt Easy Guider Exposure: RGB = 40:40:40 Ha = 110m AstroDon RGB Combine Ratio: 1: 1.05: 1.11 Location: Payson, Arizona, Elevation: 5150 ft. Sky: Seeing FWHM = 6 arcsec (Maxim DL - 10min subframe), Transparency 7/10 Outside Temperature: 65 F CCD Temperature: -30 C Image Processing Tools: Maxim DL: Calibration, deblooming (Starizona Debloomer), aligning, stacking Gralaks Sigma: Stacking PixInsight: Curves, Deconvolution, noise reduction Photoshop CS2: Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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