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NGC 6173 and Galaxy Group HDC 952

 

CLICK ON IMAGE FOR FULL SIZE VIEW (4127x2806)

Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 5 and 13 May 2021  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: Exposure: L - 74 x 4 minutes (gain-121 2x2) ,  RGB - 20 x 3 min each filter (gain-121 2x2).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels,  RGB combine, Luminance layering - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering.  Image processed at 4144x2822 resolution. Final Image size is approximately  4127x2806.

North is up in this image.  This image encompasses the galaxy group HDC 952 It consists of members NGC 6173, 6175, 6180, and LEDA 140634. There are many other galaxies in this field - notable are NGC 6184 and NGC 6174. However, the location of NGC 6174 is uncertain given differences  in catalogs and databases for this object . Many of the galaxies in this image are also members of the very expansive Abell 2199 galaxy cluster whose center is about 1.3 degrees south of this field.  Many of the background galaxies fall into the range of 300 to 500 million light years distant. There are visible Quasars in the image - the largest redshift is 2.332 with a lookback  of 10.87 billion light years.  These objects, information, and some of the brighter stars are identified in the annotated image. The annotation shows the two possible locations  NGC 6174. Horizontal FOV is approximately 39 arc minutes. Full size image scale is approximately 0.57 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 16h 29m 58s Dec: +4044'51"

 

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