arjen van der wel -- mpia, heidelberg

Arjen van der Wel -- MPIA, Heidelberg

THE PATH FROM COMPACT Z = 2 GALAXYTO GIANT ELLIPTICAL

with the 3D-HST and CANDELS teams



The size-mass relationfrom CANDELS & 3D-HST





Why spend >800 orbitson blank pieces of sky?

5 kpc NGC 300 M871 kpc

gradual gas accretion/coolingstar formation

early, rapid dissipationmerging

Disks Spheroids

Global structure encodes formation/assembly history

ESO / La Silla ESA / Hubble

CANDELS• Multi-Cycle Legacy Program -- 902 orbits• PIs: Sandy Faber (UCSC) & Harry Ferguson (STScI)• NUV -- NIR imaging over 788 sq. arcmin. / 5 fields

3D-HST• Treasury Program -- 245 orbits• PI: Pieter van Dokkum (Yale)• optical/NIR grism spectroscopy of 4 CANDELS fields

Grogin et al. (2011); Koekemoer et al. (2011)Brammer et al. (2012)

CANDELS & 3D-HST

Arjen van der Wel -- MPIA




For this talk• ~40,000 galaxies at 0 < z < 3• with redshifts, stellar masses, colors• robustly measured half-light radii

CANDELS & 3D-HST





For this talk• ~40,000 galaxies at 0 < z < 3• with redshifts, stellar masses, colors• robustly measured half-light radii

CANDELS & 3D-HST


Photometry (+redshifts, masses, etc)Skelton et al. 2014, arXiv:1403.3689

Sizes (+ Sersic n, axis ratios, etc.)van der Wel et al. 2012, ApJS, 203, 14

Sersic index = 5.9 Residual = 11%Elliptical

Spiral Sersic index = 1.4 Residual = 21%

How are sizes measured?

Sersic profile:

GALFIT (Peng+10)

Color-color separation into two types (e.g., Wuyts+07)




Sersic n > 2.5

Sersic n < 2.5

Evolution of the size-mass distribution




1.2 < z < 2 (Cimatti+08) 2 < z < 2.5 (van Dokkum+08)

Co-moving number density evolution

Muzzin+13

All Early Types


Muzzin+13

All Early Types Compact Early Types


Muzzin+13

All Early Types Compact Early Types

Increasing number density of early-type galaxiesfrom z ~ 3 to the present

Decreasing number density of small early-type galaxies from z ~ 1-1.5 to the present

also see Cassata+11, Newman+12, Szomoru+12, Cassata+13but cf. Carollo+13; Poggianti+13

Combined mass and size growth

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)

van der Wel+11 (based on WFC3 Early Release Science data (PI: Windhorst)

Disk-like quiescent galaxies at z ~ 2

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

Present-day descendants

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10,000 SDSS Early Types at z < 0.1

van der Wel+09

• 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.

Summary


arjen van der wel -- mpia, heidelberg

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