SED of Cheshire Cat System C

Matching lensed pairs in system C has proven troublesome due to similarity in color. In this blog, I try to differentiate lensed pairs.

In all v5 version glafic model, only 4 lensed images are used, which are [C1a, C1b], [C2a, C2b]

There are more lensed images in system C identified but it is not clear which image belong to which pair.

For example, I can identify this much lensed images here:

Simply based on color: We can tell C12, C13 and C16 can be likely pair-up

SED of C11, C12, C13 and C16 shows good similarities

C16 is slightly closer to BCG and it is not located along the C13/14/15/17/18/19 arc. It is possible that C16 is not related to C11/12/13

Delens-Relens of C16 using V5 2nfw run2 (yet to be put online)

shows that it is a singly lensed in the smile region

While Delens-relens of C11 & C12 shows it can be paired up with C13, but it also predicts counterimage top right of C19, where we didn't see anything.

The other set of similar SED are C14/15/17/18/19, the are similar in the sense that they all peaks at 450nm

Of course one can argue C14/17/18 have better similarity (if this term make any sense.)

Delens-relens of C15 is inconclusive, since it predicts a counterimage near C11, which has a different SED. Still, it predicts a counterimage near C18.

Delens relens of C17 shows no counterimage

This could due to critical curve directly run through the lensed image.

Delens relens of C18 shows a possible counterimage near C15 and C11

Delens relens of C19 shows a possible counterimage near C14 and C11

and SED of C14 and C19 does shows some similarities

To conclude:

C11 seems to be the "universal" counterimage, C19,18, 15 all predicts counterimage there, however C11 has a different SED from C19,18,15. It could be due to multiple knots being relens-ed there, resulting a different SED.

C12 can be pair up with C13.

C14 can be pair up with C19

C15 can be pair up with C18

C16 is singly lensed.

C17 is singly lensed.

There will be follow-ups on C2d, C2e and C2g in the next post.