Work in progressA visual comparison between mock

catalogues and 6dF dataMock catalogues from Shaun Cole, Durham Astrophysics Theory group and VIRGO consortium The surfaces shown enclose minimal spanning trees formed by a maximum percolation distance of 100 km/s and with a minimum of 50 member galaxies. The view is towards the South Celestial Pole, Northern Galactic Hemisphere to the left, Southern Galactic Hemisphere towards the right. The 6dF data (early 2005) used here is a bit thin towards the centre (i.e. towards the SCP).The images can, if necessary, be viewed in 3D with ChromoDepth spectacles. Otherwise depth can be perceived by white=near, blue=far.

Tony Fairall, Department of Astronomy, University of Cape Town.Feb 2006 using ‘Labyrinth’ software developed by Carl HultquistAnd Samesham Perumal.fairall@science.uct.ac.za

General views

6dFMock 1 general

Mock 2 general 6dF

Mock 3 general 6dF

6dFMock 4 general

6dFMock 5 general

6dFMock 6 general

6dFMock 7 general

6dFMock 8 general

6dFMock 9 general

6dFMock 10 general

Comments: The general similarity of texture speaks well for the simulations, and the differences are often more subtle than obvious. Void sizes is one discriminator, proportion of open space another.

Not knowing the parameters of the mock catalogues, I could take an unbiased view. The best match in my opinion was with Mock catalogue number 2.

Close-up views

Mock 1 Close up 6dF

Mock 2Close up

6dF

Mock 3Close up 6dF

6dFMock 4Close up

6dFMock 5Close up

6dF

Mock 6Close up

6dF

Mock 7Close up

6dF

Mock 8Close up

6dF

Mock 9Close up

6dFMock 10Close up

In general the mock catalogues seem ‘too busy’ compared to 6dF. 6dF shows much more open space. Mock catalogue 1 seems the best fit.

Very close up

Mock 1Very close

6dF

Mock 2Very close

6dF

Mock 3Very close

6dF

6dF

Mock 4Very close

6dF

Mock 5Very close

6dF

Mock 6Very close

6dF

Mock 7Very close

6dF

Mock 8Very close

6dF

Mock 9Very close

6dF

Mock 10Very close

In general, the mock catalogues seem too crowded, and have far too little open spaces, compared to 6dF. The Mock catalogues suggest a fractal structure that repeats on ever smaller scales, while 6dF seems to ‘go no further’.

Best match, in my opinion, would be Mock catalogue 1.