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NGC 5434 and HDC 843, 846 Galaxy Groups



Scope: FSQ-106N at f/8- w/ Q-Telex, Location: DAA Observatory, Shelter Valley, CA, 24 and 30 April  2022,  Camera: ASI1600M (Astronomik Gen 2  LRGB Filters)

Exposure: Exposure: L - 72 x 4 minutes (gain-139 1x1) ,  RGB - 22 each x 2.5 minutes  - (gain-100 1x1).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight (WBPP).  Mure Denoise - PixInsight. Photometric RGB calibration - PixInsight (SPCC). Non-linear stretching, normalization and gradient removal - PixInsight.  Star reduction by lighter stretch stars only  - PixInsight, Affinity Photo. Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Affinity Photo. Deconvolution - BlurXTerminator. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering.  Image processed at 4656x3520 resolution. Final Image size is approximately  4610x3493.

North is up in this image.  This is a chain of galaxies from galaxy groups [CHM2007] HDC 843 and HDC 846. This chain is reminiscent of the larger Markarian's Chain in Virgo / Coma Berenices. The three galaxies in the upper left belong to the HDC 846 group (NGC 5436, 5437, 5438); most of the rest belong to HDC 843. The HDC 846 group averages about 330 million light years and HDC 843 averages about 275 million light years distance. One notable exception is NGC 5434 - it is unusual in the sense that the Tully-Fisher distances are wildly inconsistent with the redshift estimated distance (12.2 mly by Tully-Fisher and 224 mly by redshift). There are a large number of background galaxies - many are visible in the full size image. Also in this image is the Abell Galaxy Cluster ACO 1850 - it's distance is about 1.4 billion light years. Further back in distance are the quasars - nine are visible in this image.  The visible Quasars range from 3.419 to 11.52 billion light years lookback.   These objects, information, background galaxies and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 78 arc minutes. Full size image scale is approximately 1.0 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 14h 02m 54s   Dec: +09 21' 03"



All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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