A new graph-theory based FOF group finder and its application to the updated 2MRS

Speaker and affiliation: 
Trystan Lambert (University of Cape Town)
Tue, 2020-06-09 12:00 to 13:00

We present the galaxy group catalog for the newly completed 2MASS Redshift Survey up to a magnitude limit of K < 11.75. Consisting of ~ 45 000 redshifts, including 1 041 previously unpublished
redshifts mostly distributed along the Zone of Avoidance. The galaxy group catalog is generated by using a novel, graph theory based, modified version of the friends-of-friends algorithm. The results and
methods have been thoroughly interrogated against previous 2MRS group catalogs by making use of cutting edge visualization techniques including immersive facilities, a digital planetarium, and virtual
reality. The final catalog consists of ~ 3 000 groups resulting in the most complete "whole-sky" galaxy group catalog to date.