ARG00023cd AGN GALAXIES was there a encounter of the GALAXIES

• by A1001

  NORTH 2MASX J15040076+2406176 -- Active Galaxy Nucleus SDSS J150400.74+240617.5 z 0. 069

  SOUTH 2MASS J15040320+2405599 -- Active Galaxy Nucleus SDSS J150403.17+240559.9 z 0. 070

  THE RADIO SOURCES. was there a encounter of the galaxies.

  

  Posted July 27, 2017 4:34 PM

• by JeanTate in response to A1001's comment.

  I'm certainly no expert (there are some over in GZ Talk), but I think it's generally difficult/impossible to tell whether the "encounter" between two (or more!) galaxies is just getting started, is mid-way, or just ending. Unless there's what "now" looks like just one, very messed-up galaxy; then it's generally called a 'late-stage merger'.

  I don't even know whether there is a good theoretical/modelling basis for saying what proportion of interacting galaxies are 'fly-bys' (i.e. they have an encounter, then each flies off, disturbed but still un-merged) vs those which (eventually) merge. Certainly some mergers happen after more than one encounter.

  Hope this helps! 😃

  Posted September 25, 2017 7:48 PM