meeting 2023 11 27 n57 - JacobPilawa/TriaxSchwarzschild_wiki_5 GitHub Wiki

These new environmental plots are complete, I believe. Specifically, this has all black holes above 3e9 Msun from the following works:

• Saglia+16
• Thomas+16
• Thater+19
• Thater+22
• I chose to leave out 2 potential measurements, one of them being the 40 billion Msun H15A measurement and Neureiter+23 which claims to constrain total mass of BBH in formation.

I'm following the calculation for nu10 as described in MASSIVE VII:

• Cappellari+2011b computes this by taking the 10 nearest neighbors from the Atlas3D parent sample, which has all galaxies (including spirals) with M_K < -21.5; the equivalent completeness cutoff for MASSIVE would have to be M_K = -24.0; for compromise and ability to compare the two samples, Paper VII chose a cut of the MASSIVE parent sample of M_K < -23.0. This is what I am presenting here.
• Parent sample: Obtained from 2MRS catalog with magnitude cut of M_K < -23.0
• Worst case errors from Paper VII: something like ~0.5 dex in nu_10.
• For distances, we assume the high-density contrast distance first (Crook+2007), then LDC, and then redshift distance straight from 2MRS as a last resort. Note that this effectively flattens groups and generally result in higher nu10.

Note that:

• rho10 = Ngal / (4/3 * pi * r10^3) -- number density of galaxies in sphere of radius r10
• sig3 = Ngal / (pi * R3^2) -- surface density of galaxies in cylinder of radius r3 and height of +/- 300 km/s