Phil's Astro Photography
Contact me at starsman53@yahoo.com
NGC 3628 Hamburger Galaxy
Image Information: This is a composite CCD image taken with an SBIG ST-10 XME CCD camera on a Takahashi T0A-130 refractor with the focal reducer in operating at F5.8. The image was shot from Bob and Sally Barrow’s property located west of Fredericksburg, Texas on the nights of April 19th, 20th and 21st 2012.  

One of the primary goals I had was to record the faint tidal tail along with the galaxy. There are many images available that show the galaxy, but few images show the tail which I think is the most unique feature of this galaxy. I shot three sets of luminance data recorded 5 minute, 10 minute and 20 minute intervals. There’s 140 minutes of 5 minute data and 180 minutes each for the 10 and 20 minute data. The RGB data was recorded at 5 minute intervals, there’s 40 minutes of red, green and blue data. The luminance data was recorded at Bin 1 and the RGB data was Bin 2.  

After completing preliminary processing in Maxim, Photoshop CS4 was used for final processing. Each of the three luminance files were imported into Photoshop separately and processed to bring out specific details in the image. The 20 minute data was used to reveal the tidal tail, the 5 minute data was used to show the bright core region of the galaxy and the 10 minute data filled in the mid range area. "Hide all” layer masks were used and partially erased to reveal the desired features in each layer. A number of other processing steps were required to complete the image.