www.galaxies.se - by Ivar Hamberg

QSO's, Quasi Stellar Objects:

Here are a few QSO's of interest.

AGC779:

This is a galaxy cluster at about 300 million light-years away. Far beyond these galaxies there are a number og QSO's at a very large distance. While looking in the NED database I spotted some 40+ quasars at a redshift "z" of 1.0 to 3.9. The one furthest away is at z=3.91, and this corresponds to a "Light Travel Time" of 12.2 Billion years, or 12.2 Gyr. This is just shy of the age of the Universe at a light travel time of 13.8 Gyr. Pretty amazing!

Below there are 5 QSO's identified close to NGC2832. They are at 9.8-12.2 Gyr light travel time distance.

(There are at least 4 more very distant ones just to the left and north of this cropped image, at z=3.7-3.9. But they were too faint to identify.)

The original image is a 1h50min LRGB exposure but with somewhat IR-transparent C-filter. Below is a negative monochrome version used as a finder map. Magnitudes are for "Gunn g", probably close to V.

(Johnson V from g: V = g - 0.03 - 0.42*(g-r) as I understand it. )