The Mass of M31

Transcript

1. THE MASS OF M31 THE FULLY SELF-CONSISTENT DYNAMICAL MODEL GALAXY COFFEE MPIA 2012
2. DAN FOREMAN-MACKEY DANFM.CA GITHUB.COM/DFM NEW YORK UNIVERSITY LARRY WIDROW WITH: QUEEN'S UNIVERSITY, CANADA
3. WHAT DO WE WANT TO DO? BUILD A TOOL FOR DYNAMICAL MODELING OF DISK GALAXIES USING ALL AVAILABLE DATASET SELF-CONSISTENTLY PHYSICALLY MOTIVATED i.e. not mass modeling...
4. WHAT HAVE WE DONE? BUILT A MODEL OF ANDROMEDA USING A LOT OF DATASETS SELF-CONSISTENTLY PHYSICALLY MOTIVATED * *WAIT TWO SLIDES
5. van der Marel & Guhathakurta (2008) Widrow, Pym & Dubinski (2005) Evans & Wilkinson (2000) Kuijken & Dubinski (1995) WHERE DOES THIS COME FROM?
6. Radius HI-rotation curve Corbelli et al. (2010) surface brightness profile Barmby et al. (2006) satellite galaxy kinematics PAndAS, SPLASH, et al. Conn et al. (2011, in prep) ~10 kpc ~500 kpc Data PLUS: HALO STARS GLOBULAR CLUSTERS PLANETARY NEBULAE ETC.
7. GALACTICS f(E, Lz, Ez) = fh(E) + fb(E) + fd(E, LzEz) ⇢(r, z) = ⇢h( (r, z)) + ⇢b( (r, z)) + ⇢d(r, z) r2 = 4 ⇡ G ⇢
8. GALACTICS f(E, Lz, Ez) = fh(E) + fb(E) + fd(E, LzEz) ⇢(r, z) = ⇢h( (r, z)) + ⇢b( (r, z)) + ⇢d(r, z) r2 = 4 ⇡ G ⇢ Generative Model
9. GALACTICS f(E, Lz, Ez) = fh(E) + fb(E) + fd(E, LzEz) ⇢(r, z) = ⇢h( (r, z)) + ⇢b( (r, z)) + ⇢d(r, z) r2 = 4 ⇡ G ⇢ Generative Model Likelihood Function
10. GALACTICS f(E, Lz, Ez) = fh(E) + fb(E) + fd(E, LzEz) ⇢(r, z) = ⇢h( (r, z)) + ⇢b( (r, z)) + ⇢d(r, z) r2 = 4 ⇡ G ⇢ Generative Model Likelihood Function 19 Parameters
11. Generative Model Likelihood Function ☁ x
12. Generative Model Likelihood Function ☁ x emceethe MCMC Hammer arxiv.org/abs/1202.3665 danfm.ca/emcee github.com/dfm/emcee paper documentation issues/contributions
13. 40 60 80 100 120 140 160 R [arcmin] 180 200 220 240 260 280 300 320 vcirc [km s 1] 100 101 102 R [arcmin] 15 16 17 18 19 20 21 22 23 24 µ [mag arcsec 2]
15. BONUS
16. BONUS