Arjen van der Wel -- MPIA, Heidelberg

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1 THE PATH FROM COMPACT Z = 2 GALAXY TO GIANT ELLIPTICAL Arjen van der Wel -- MPIA, Heidelberg with the 3D-HST and CANDELS teams

2 THE PATH FROM COMPACT Z = 2 GALAXY TO GIANT ELLIPTICAL The size-mass relation from CANDELS & 3D-HST Arjen van der Wel -- MPIA, Heidelberg with the 3D-HST and CANDELS teams

3 THE PATH FROM COMPACT Z = 2 GALAXY TO GIANT ELLIPTICAL Why spend >800 orbits on blank pieces of sky? Arjen van der Wel -- MPIA, Heidelberg with the 3D-HST and CANDELS teams

4 Global structure encodes formation/assembly history Disks Spheroids 5 kpc NGC kpc M87 ESO / La Silla gradual gas accretion/cooling star formation ESA / Hubble early, rapid dissipation merging

5 CANDELS & 3D-HST Grogin et al. (2011); Koekemoer et al. (2011) Brammer et al. (2012) CANDELS Multi-Cycle Legacy Program orbits PIs: Sandy Faber (UCSC) & Harry Ferguson (STScI) NUV -- NIR imaging over 788 sq. arcmin. / 5 fields 3D-HST Treasury Program orbits PI: Pieter van Dokkum (Yale) optical/nir grism spectroscopy of 4 CANDELS fields Arjen van der Wel -- MPIA

6 CANDELS & 3D-HST Grogin et al. (2011); Koekemoer et al. (2011) Brammer et al. (2012) CANDELS Multi-Cycle Legacy Program orbits PIs: Sandy Faber (UCSC) & Harry Ferguson (STScI) NUV -- NIR imaging over 788 sq. arcmin. / 5 fields 3D-HST Treasury Program orbits PI: Pieter van Dokkum (Yale) optical/nir grism spectroscopy of 4 CANDELS fields For this talk ~40,000 galaxies at 0 < z < 3 with redshifts, stellar masses, colors robustly measured half-light radii Arjen van der Wel -- MPIA

7 CANDELS & 3D-HST Grogin et al. (2011); Koekemoer et al. (2011) Brammer et al. (2012) CANDELS Multi-Cycle Legacy Program orbits PIs: Sandy Faber (UCSC) & Harry Ferguson (STScI) NUV Photometry -- NIR imaging (+redshifts, over 788 sq. masses, arcmin. etc) / 5 fields Skelton et al. 2014, arxiv: D-HST Treasury Program orbits PI: Pieter Sizes van (+ Dokkum Sersic (Yale) n, axis ratios, etc.) optical/nir van der grism Wel spectroscopy et al. 2012, ApJS, of 4 CANDELS 203, 14 fields For this talk ~40,000 galaxies at 0 < z < 3 with redshifts, stellar masses, colors robustly measured half-light radii Arjen van der Wel -- MPIA

8 How are sizes measured? Elliptical Sersic index = 5.9 Residual = 11% Spiral Sersic index = 1.4 Residual = 21% GALFIT (Peng+10) Sersic profile:

9 How are sizes measured? Elliptical Sersic index = 5.9 Residual = 11% Spiral Sersic index = 1.4 Residual = 21% GALFIT (Peng+10) Sersic profile:

10 Arjen van der Wel -- MPIA Color-color separation into two types (e.g., Wuyts+07)

11 Color-color separation into two types (e.g., Wuyts+07) Sersic n > 2.5 Sersic n < 2.5 Arjen van der Wel -- MPIA

12 Arjen van der Wel -- MPIA Color-color separation into two types (e.g., Wuyts+07)

13 Arjen van der Wel -- MPIA Evolution of the size-mass distribution

14 Arjen van der Wel -- MPIA Evolution of the size-mass distribution

15 Arjen van der Wel -- MPIA Evolution of the size-mass distribution

16 Evolution of the size-mass distribution 1.2 < z < 2 (Cimatti+08) 2 < z < 2.5 (van Dokkum+08) Arjen van der Wel -- MPIA

17 Arjen van der Wel -- MPIA Evolution of the size-mass distribution

18 All Early Types Co-moving number density evolution Muzzin+13

19 Co-moving number density evolution All Early Types Compact Early Types Muzzin+13

20 Co-moving number density evolution All Early Types Compact Early Types Muzzin+13

21 Co-moving number density evolution All Early Types Compact Early Types Increasing number density of early-type galaxies from z ~ 3 to the present Decreasing number density of small early-type galaxies from z ~ to the present also see Cassata+11, Newman+12, Szomoru+12, Cassata+13 but cf. Carollo+13; Poggianti+13 Muzzin+13

22 Combined mass and size growth

23 Combined mass and size growth Growth in mass by a factor 2-3: Number density matching (e.g., Lundgren+14) Abundance matching (e.g., Moster+13)

24 Combined mass and size growth Growth in mass by a factor 2-3: Number density matching (e.g., Lundgren+14) Abundance matching (e.g., Moster+13)

25 Combined mass and size growth Growth in mass by a factor 2-3: Number density matching (e.g., Lundgren+14) Abundance matching (e.g., Moster+13)

26 Disk-like quiescent galaxies at z ~ 2 van der Wel+11 (based on WFC3 Early Release Science data (PI: Windhorst) Yu-Yen Chang, van der Wel+13ab (CANDELS): majority of z~2 quiescent galaxies are oblate with an intrinsic axis ratio of c/a ~ 0.3

27 projected axis ratio Present-day descendants 10,000 SDSS Early Types at z < 0.1 van der Wel+09

28 Summary CANDELS & 3D-HST have provided an enormous increase in sample size and dynamic range in the empirical description of the size-mass distribution (van der Wel+14). First constraints on the (non-)evolution of scatter and slope. Increasingly clear path from compact, disk-like quiescent galaxy to massive elliptical. Arjen van der Wel -- MPIA

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