BEAST intro talk: What's in a catalog paper?

Given at a BEAST Hack Day to introduce some of the possible BEAST science results.

Transcript

1. What's in a BEAST catalog paper? Lea Hagen BEAST Hack Day 17 Jan 2020 https://github.com/BEAST-Fitting/beast/issues/333
2. Paper topics 1. Fitting process 2. BEAST verification 3. BEAST fitting results 4. Initial science (baby beasts)
3. 1. Fitting procedure • Model grid (including subgrids) • Dividing by source density or background • Artificial star tests • Noise model • Trimming model/noise grids • Fitting (including merging)
4. 2. BEAST verification: parameter recovery BEAST #441 log Mini log A AV log Z fA RV D Two Noise Models Simulated Value Recovered Value
5. 2. BEAST verification: stars with spectral types Teff & log(g) from the BEAST Spectral type from the literature B1.5 II Look up the corresponding Teff & log(g) Compare values
6. 2. BEAST verification: completeness log Mini log Mini log A log A log Z log Z fA fA AV RV RV Completeness BEAST #465
7. 3. BEAST fitting results: example fit Primary parameters: AV, mass, age Secondary parameters: RV, fA, metallicity Derived parameters: Teff, log(g) Gordon+16 Figure 14. The fitting results for an individual star in Brick21 are shown. While this figure illustrates the fit to an individual source, it is for a red giant star that is one of the common sources we find in the PHAT region. The 50% model is shown along with shaded colored regions indicating the range of models that fit within 1σ. The models shown are the full model including the observational bias (stellar+dust+bias), the physical model alone (stellar+dust), and the stellar model alone (stellar). The Astrophysical Journal, 826:104 (20pp), 2016 August 1 Gordon et al.
8. 3. BEAST fitting results: catalog description https://beast.readthedocs.io/en/latest/outputs.html RA, Dec, measured fluxes, predicted fluxes, chi2, Av_Best, Av_Exp, Av_p50, Av_p16, Av_p84, Rv_Best, Rv_Exp, ...
9. 3. BEAST fitting results: uncertainties & HR diagrams BEAST #458 σ(Param) vs. Param σ-colored HRD log A fA RV AV
10. 4. Science: everything vs. everything log Z fA RV D log Mini log A AV RV log A fA log Mini log Z D (artifacts are because this is a coarse test grid) BEAST #441
11. 4. Science: candidates of star types Extinguished OB stars for extinction curves Dusty AGB stars (high AV failure mode) Things not in the BEAST grid (background galaxies, MW stars, etc)
12. 4. Science: naive parameter maps AV [5’’ res., BEAST] AV [17’’ res., BEAST] S250 [MJy/sr] 1’ = 14.5 pc Relative opacity Roman-Duval+19; C. Murray
13. 4. Science: naive IMF