Component model 2008 uw astr 323 sp13 eric agol 2013

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Unformatted text preview: from SDSS •  Fit with 3 components: ρ( z, R) = ρ thin e−( R − R 0 ) / h R ,thin − z / zthin + ρ thick e−( R − R 0 ) / h R ,thick − z / zthick $ 'n R0 ) + ρ halo & & R 2 + ( z / q) 2 ) % ( € 4/4/13 •  For blue & yellow stars (like Sun), best fit by a 3- Juric et al. component model (2008) UW, ASTR 323, SP13, Eric Agol ©2013 4 Best- fit to Milky Way 3- component model Juric et al. (2008) 4/4/13 The limitations of SDSS Best- fit parameters give: data •  S• Sky Coverage: id- plane ⇥1/4 un height above m “only” of=24±5 pc Z0 the sky •  S• Depth: main-sequence stars cale lengths of thin disk: to ⇥ 10____ ± RRpLyrae stars zthin = kpc; 60 c to 100 2.6 ± 0.5 kpc hR,thin = kpc •  S• Photometric hick dAccuracy: cale lengths of t isk: ⇥0.02 =mag for 80 pc u band, zthick ____ ± 1 the limits = 3.6 ± 0.7 kpc of photohR,thick the accuracy metric metallicity •  Parameters of halo: estimates to=⇥0.2 ± 0.1 q 0.64 dex • Astrometric Accuracy: th...
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