Distinguishing Rotating Disks from Major Mergers

Kristen Shapiro and the SINS team:

Kinemetry of High-Redshift Galaxies

R. Genzel, N.M. Förster Schreiber, L.J. Tacconi, F. Eisenhauer, N. Bouché, D. Lutz, R. Davies, G. Cresci, S. Genel, E. Hicks, R. Bender, S. Seitz, A. Verma,

M. Lehnert, N. Nesvadba, A. Sternberg, R. Ivison, F. Bertoldi, A. Blain, S. Chapman, P. Cox, T. Greve, R. Neri, A. Omont, I. Smail, D. Erb, A. Shapley, C. Steidel, A. Cimatti,

E. Daddi, A. Renzini, V. Mignoli, N. Arimoto, X. Kong

dispersiondominated rotation

dominated

70

-70

D3a 4751 (2.27)

SA12 6339 (2.3)

-50

30

35-20

BX 502 (2.16)

BX 405 (2.03)

-35

40

-30

30BM 1163 (1.41)

BX 404 (2.03)

-5

30

merger

-60

70

K20-6 (2.2)

-80

100BX 599 (2.33)

GK 167 (2.58)

-60

30

-70

70

GK2252 (2.41)

-280

280

BX389 (2.2)

170

K20-5 (2.2)-170

-120

120D3a 7144 (1.7)

-70

150SA12 6192 (1.51)

-10080

K20-8 (2.2)

ZC1101592 (1.41)

-240

240

GK2471 (2.43)

-170

170

+ 130

- 90

D3a 6004 (2.4)

-140

140

D3a 6397(1.51)

-170

200

BX 610 (2.2)

240

-160K20-9 (2.0)

+160

-120

BX663 (2.4)

-70

110

BX528 (2.3)

160

-3050

GK 2113 (1.61)

0+380

-80

K20-7 (2.2)

120

200

-200

D3a 15504 (2.4)

-160

160

ZC782941 (2.2)

-200

+200

BX482 (2.2)

SA12 8768 (2.2)

80

-45

1 (8 kpc)

170

-170

MD 41 (2.2)

Förster Schreiber et al. (2008)

The SINS SurveyThe SINS Survey

0

100

200

300

400

0 5 10 15 20 25

BzK-15504 2.38CDFS-K20-id5 2.23Q2343-BX389 2.17SSA22-MD41 2.17Q2343-BX610 2.21

galactocentric radius (kpc)

rotation velocity (km/s)

Qualitative Comparison to z~0 Spiral Galaxies

Local rotation curves fromSofue & Rubin 2001

Qualitative Comparison to z~0 Template Galaxies

Local Spiral Galaxy Local ULIRG

Shapiro et al. 2008

Daigle et al. 2006 Colina et al. 2005

Qualitative Comparison to z~0 Template Galaxies

Local Spiral Galaxy Local ULIRG

Shapiro et al. 2008

Daigle et al. 2006 Colina et al. 2005

Total: ~30 template galaxies, from local observations and simulations of high-z systems(Simulations from Naab et al. 2007)

Quantifying Velocity Fields with Kinemetry

…

Kinemetry analysis of first and second velocity moment for

highest quality SINS data

Krajnović et al. 2006

Quantifying Velocity Fields with Kinemetry

…

Kinemetry analysis of first and second velocity moment for

highest quality SINS data

Krajnović et al. 2006

B1

B3

Quantifying Velocity Fields with Kinemetry

…

Kinemetry analysis of first and second velocity moment for

highest quality SINS data

Krajnović et al. 2006

Classifying z~0 Template Galaxies

Shapiro et al. 2008

Classifying z~0 Template Galaxies

Shapiro et al. 2008

…

Kinemetry analysis of first and second velocity moment for

highest quality SINS data

Krajnović et al. 2006

disk galaxies

mergers

Classifying z~2 UV/optical-Bright Systems

Shapiro et al. 2008

Kinemetry analysis of first and second velocity moment for

highest quality SINS data

disk galaxies

mergers

2 / 3 are disk-like

Classifying z~2 UV/optical-Bright Systems

Shapiro et al. 2008

Formation of Disks at z~2

MSF Region ~ 108 M

SFR ~ 100-200 M/yr Genzel et al. 2006

500

5070

160

BzK-6004 BzK-ZC782941

60170

BzK-15504

Hα Integrated

flux

(km/s)

FWHM

Formation of Disks at z~2

M* ~ 8 x 1010 M

SFR ~ 100-200 M/yrAge ~ 500 Myr

Genzel et al. 2006

Formation of Disks at z~2

tstars ~ 500 MyrSED Modeling

v / 2-4 taccretion ~ tgas exhaustion ~ 200-800 Myr

(rapid) inflow scenario:Dekel & Birnboim 2003,Immeli et al. 2004,D’Onghia et al. 2006

Genzel et al. 2006

Future Evolution of z~2 Disks

Immeli et al. 2004Genzel et al. 2008

The Evolution of z~2 UV/optical-bright Systems

Population consists mainly of large, rotating disks

Likely formed via smooth accretion, not major mergers

Evolve into z~0 bulge-dominated systems

Secular evolution may play an important role