NGC 4731, 4731A, and IC 3812 (Jim Thommes)

NGC 4731, 4731A, and IC 3812

Revision title: Full FOV Image - NGC 4731, 4731A, and IC 3812

Link: https://www.jthommes.com/Astro/NGC4731.htm

NGC4731 is the dominant galaxy in this image - it is a Seyfert 2 galaxy, classed SB(s) cd. Its distance is 84 million light years by redshift estimate (40 mly by independent Tully-Fisher estimate). Its smaller companion galaxy to the right is NGC 4731A (also known as Holmberg 472B) - also a Seyfert 2, distance of 85 million light years by redshift estimate and classed Im pec. Smaller galaxies in the upper right are IC 3812, LEDA 1029635, LEDA 1029569 (top down). IC 3812's distance is estimated at 172 million light years (by redshift). There are many background galaxies in this image that are best seen in the full size image. There are three Quasar candidates in this image (as seen on the annotated image) - all of which are somewhat "average" redshift (light travel time or Lookback up to 9.154 billion years, redshift up to 1.400). These objects, information, and some of the brighter stars are identified in the annotated image. (zoomable website image)

Full size image (zoomable website image)

Yes, the problem with this data is that there were no Green subframes acquired. (Operator error with NINA at the time and not discovered until much later). So full disclosure. I created a synthetic green from red and blue prior to SPCC in PixInsight. After SPCC (which seemed to calibrate well with tight regression lines), the color seemed reasonable compared to other images on astrobin, so I proceeded with the processing. If you have any disagreement with the resulting color in the image, I accept your criticism.

Original
Final
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Title: Full FOV Image - NGC 4731, 4731A, and IC 3812

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Title: NGC 4731, 4731A, and IC 3812 Annotated

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