Transcript Arjen van der Wel -- MPIA, Heidelberg

THE PATH FROM COMPACT Z = 2 GALAXY
TO GIANT ELLIPTICAL
Arjen van der Wel -- MPIA, Heidelberg
with the 3D-HST and CANDELS teams
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
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
Global structure encodes formation/assembly history
Disks
5 kpc
Spheroids
NGC 300
ESO / La Silla
gradual gas accretion/cooling
star formation
1 kpc
M87
ESA / Hubble
early, rapid dissipation
merging
CANDELS & 3D-HST
Grogin et al. (2011); Koekemoer et al. (2011)
Brammer et al. (2012)
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
Arjen van der Wel -- MPIA
CANDELS & 3D-HST
Grogin et al. (2011); Koekemoer et al. (2011)
Brammer et al. (2012)
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
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
CANDELS & 3D-HST
Grogin et al. (2011); Koekemoer et al. (2011)
Brammer et al. (2012)
CANDELS
• Multi-Cycle Legacy Program -- 902 orbits
• PIs: Sandy Faber (UCSC) & Harry Ferguson (STScI)
-- NIR imaging
over 788 sq.
arcmin.etc)
/ 5 fields
• NUVPhotometry
(+redshifts,
masses,
Skelton et al. 2014, arXiv:1403.3689
3D-HST
Program -- 245 orbits
• TreasurySizes
Sersic (Yale)
n, axis ratios, etc.)
Dokkum
• PI: Pieter van(+
van dergrism
Wel spectroscopy
et al. 2012, ApJS,
203, 14 fields
of 4 CANDELS
• optical/NIR
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
How are sizes measured?
Elliptical
Sersic index = 5.9
Residual = 11%
Spiral
Sersic index = 1.4
Residual = 21%
GALFIT (Peng+10)
Sersic profile:
How are sizes measured?
Elliptical
Sersic index = 5.9
Residual = 11%
Spiral
Sersic index = 1.4
Residual = 21%
GALFIT (Peng+10)
Sersic profile:
Color-color separation into two types (e.g., Wuyts+07)
Arjen van der Wel -- MPIA
Color-color separation into two types (e.g., Wuyts+07)
Sersic n > 2.5
Sersic n < 2.5
Arjen van der Wel -- MPIA
Color-color separation into two types (e.g., Wuyts+07)
Arjen van der Wel -- MPIA
Evolution of the size-mass distribution
Arjen van der Wel -- MPIA
Evolution of the size-mass distribution
Arjen van der Wel -- MPIA
Evolution of the size-mass distribution
Arjen van der Wel -- MPIA
Evolution of the size-mass distribution
1.2 < z < 2 (Cimatti+08)
Arjen van der Wel -- MPIA
2 < z < 2.5 (van Dokkum+08)
Evolution of the size-mass distribution
Arjen van der Wel -- MPIA
Co-moving number density evolution
All Early Types
Muzzin+13
Co-moving number density evolution
All Early Types
Muzzin+13
Compact Early Types
Co-moving number density evolution
All Early Types
Muzzin+13
Compact Early Types
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 ~ 1-1.5 to the present
also see Cassata+11, Newman+12, Szomoru+12, Cassata+13
but cf. Carollo+13; Poggianti+13
Muzzin+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)
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)
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)
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
Present-day descendants
projected axis ratio
10,000 SDSS Early Types at z < 0.1
van der Wel+09
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