meeting 2024 04 11 n57 - JacobPilawa/TriaxSchwarzschild_wiki_5 GitHub Wiki

Updated N4889's distance to 99.1 Mpc.

Fixed the N57 separations:

• I did this by keeping $\Delta r$ constant with respect to the old distance. Specifically, N57's original LDC distance was 74.47 Mpc. Ignoring the transverse distance, consider a nearby galaxy at a distance of 76.47 Mpc. The $\Delta r$ here is 2.0 Mpc, and this is the quanity I'm keeping fixed when updating the neighbor distances. So after I update the LDC distance to 66.9, I would then update the neighbor galaxy to 68.9 Mpc since this preserves the $\Delta r = 2.0 Mpc$. The resulting separations are almost identical to using the full 2MRS distances with only a slight change.
• Note that the original neighbors of N57 now have slightly fainter Mk values, now dropping ~0.2 magnitude and are now below the -23.0 cutoff. I kept them in for now since we generally wanted to preserve the neighbor membership that we originally had.

Re-computed nu10 for a host of different magnitude cutoffs to test the sensitivity of our values to these cutoffs.

• At most, it seems like our values for nu10 bounce around by ~0.25 to ~0.5 dex at the most, which is consistent with what Melanie/Irina had quoted in the environment MASSIVE paper.

I've replotted the neighbors with the magntiudes listed near the neighbors, but unsure how useful this is given the crowding. I think it's more useful to look at the nu10 vs. magntiude cutoff plot to get a sense of how things change.