meeting 2023 08 14 n57 - JacobPilawa/TriaxSchwarzschild_wiki_5 GitHub Wiki

I submitted a 2D set of 100 models with the new MGE (with sigma bounded >= 4 pixels at 0.1 arcsec/pixel) we discussed on Friday, and here are those diagnostic plots.

• Just as a reminder, this has the other parameters fixed to the best fit values of (2.4e9 Msun/pc^3 [code units] for the halo, T=0.34, Tmaj = 0.54, Tmin = 0.02)

In summary, I think that this broadly confirms that the new MGE won't impact our black hole mass or mass to light to a great extent! I think this makes sense though since the ``extra mass'' in the original MGE was only ~10% or so of the black hole mass so I didn't expect the answers to change too much.

• The previous best fit value was (5.8+/-0.7) billion for the black hole mass and (1.91+/-0.1) for the mass-to-light ratio.
• These new 100 models with the new MGE want a black hole slightly smaller (5.5 billion solar masses) and a slightly larger mass-to-light ratio of about 1.96. Note that the errors here are those returned from our dynesty and GPR routine on these 100 points, so they should be taken with a grain of salt.
• One interesting thing to note is that these 100 models all have quite a low kinematic chi2. Whereas our old cube of ~50,000 models [including the scalings] had a lowest chi2 of something like ~1276, the best performing models from this new cube have a chi2 of ~10 lower, with a minimum of 1267.33 for the model with BH = 5.6e9 and ML = 1.955.

One thing I could do is add a set of scalings on top of these models but Expanse is currently (Aug 14 from 7AM to midnight) under maintenance. Should be easy enough to do if we want but not sure it's necessary.