NGC 4725/4712 and NGC 4747 (Arp 159) (Jim Thommes)

NGC 4725/4712 and NGC 4747 (Arp 159)

Link: https://jthommes.com/Astro/NGC4725.htm

This image shows NGC 4725 - classed SAB(r)ab pec - at a distance of about 69 million light years. Along with NGC 4725 is its paired galaxy NGC 4747 (also known as Arp 159) - classed SBcd pec edge-on. Finally, there is a small dwarf galaxy of NGC 4725 -ASK 667300.0 (LEDA 43595). The three galaxies comprise the galaxy group NGC 4752/47 Group.

Background PGC galaxies range from 63 to 307 million light years. At the distance of 213 million light years is the rather large galaxy NGC 4712 - classed SA(s)bc. There is the galaxy (LEDA 135228) next to NGC 4725. Its distance is about 1,123 million light years - but is brighter than the nearby dwarf galaxy - which is only 63 million light years distant (as part of the NGC 4725/47 galaxy group.

On the upper edge of the image are several compact galaxy groups with 2.9 to 4.0 billion years of light travel time (Lookback). These galaxy groups are SDSSCGA 130 / 4SDSSCGB 2277, and SDSSCGB 12948. The data is weird with the former two in that the members' light travel times are widely different ( 0.5 vs 2.9 billion years - which would make therm unrelated). It looks like they got mushed together in the data tables somehow. You can tell the closer ones - they are colored bluish white while the further ones are reddish. In the later group, SDSSCGB 12948, the members have similar light travel times of 3.2 to 4.0 billion years.

The furthest objects visible in this image are the Quasars - many have light travel time over 10 billion years - the highest of these has a light travel time of 11.68 billion years and a redshift of 3.178. These objects, information, and some of the brighter stars are identified in the annotated image.

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