2nfw model with position fixed at BCGs

In this model, the position of nfw halo are fixed at the position of the BCGs, unlike the previous models where halo positions are freed.

Mass distribution is this

Delens-relens result for all spec-z systems are similar. However, the delens-relens results of system G and Z are poor in fix-nfw model relative to free-nfw model

In free-nfw model , the two nfw haloes are closer to each other than BCGs, around 2 arcsec closer in total.

mass distribution is like this for free-nfw model

As I said the major discrepancies occurs in G and Z:

here's the fix-nfw relens of G1

You can see relens of G1, it predicted G2 position 3 arcsec from data, and a small discrepancies for G3 position as well

While in free-nfw model, although the predicted length of G2 is longer than data, the position of G2 and position and shape of G3 is right.

Similar situation in G2

The predicted position of G1 is not right in fix-nfw model

A better result in fix-nfw model, however, both predict an image behind the nose.

And in G3:

the fix-nfw model predicts G1 position in a further position. while G2 split into two

in free-nfw model:

G1 and G2 positions are correct, although G2 is still longer than expecte.

There's also a difference in geo-z, in fix-nfw model, geo-z is z=2.6296 , in free-nfw model z=2.2288

For system Z:

Relens of Z2: fix-nfw model shows a small positional disagreement

free-nfw is good

geo-z also shows a small difference: fix-nfw is 1.4708, free-nfw is 1.3252

Note : Image G2 is really critical in determining the position of nfw. Current best model is 3 layers free-nfw position model. with mean source dispersion of 0.0385 arcsec.

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