meeting 2024 01 17 n315 - JacobPilawa/TriaxSchwarzschild_wiki

Context

I've been cleaning some of the results from last time, included some more direct comparisons between my best-fitting Gh6Mh6/Gh8Mh6 data/compared to what Irina has published in the previous kinematic papers.

Infil Plots for Various Cases

adeg = -1 (no additive polynomial case)

Plot	Gh6Mh6 non-point symm	Gh6Mh6 point symm	Gh8Mh6 non-point symm	Gh8Mh6 point symm

adeg = 0 (a constant polynomial)

Plot	Gh6Mh6 non-point symm	Gh6Mh6 point symm	Gh8Mh6 non-point symm	Gh8Mh6 point symm

Running pPXF with Exactly Irina's Settings

We discussed last time trying to reproduce Irina's exact results, and I've gotten started a bit on that front:
- Wavelength range (rest): 8420-8770 A; But masking the GMOS chip gap cuts off fit at ~8750 A.
- Template list: (15 stars from Barth et al. 2002 -- spectra are from MILES Calcium Triplet library)
- Spectrum mask: /GMOS/galaxy_files/N315/spectra/N315_spectra_mask.fits (bright sky lines and chip gaps as assessed from inspection of GMOS spectra)
- Initial velocity shift: 4950 km/s
- Multiplicative polynomial: degree 3
- Additive polynomial: degree 0 (constant offset)
- Bias parameter: 0
- 100 MCMC iterations

Despite running what I believe to be the exact settings Irina used, I am unable to get perfect agreement with her results. I hadn't had a chance to dig into the diagnostics on the template weights yet which I certainly will do, but I wanted to put up some plots on here so that we can discuss how important this is in the meantime.