Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr

S. Jogee; S. Miller; K. Penner; E. F. Bell; C. Conselice; R. E. Skelton; R. S. Somerville; H-W. Rix; F. D. Barazza; M. Barden; A. Borch; S. V. Beckwith; J. A. R. Caldwell; B. Haeussler; C. Heymans; K. Jahnke; D. McIntosh; K. Meisenheimer; C. Papovich; C. Y. Peng; A. Robaina; S. Sanchez; L. Wisotzki; C. Wolf

Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr

S. Jogee, S. Miller, K. Penner, E. F. Bell, C. Conselice, R. E. Skelton, R. S. Somerville, H-W. Rix, F. D. Barazza, M. Barden, A. Borch, S. V. Beckwith, J. A. R. Caldwell, B. Haeussler, C. Heymans, K. Jahnke, D. McIntosh, K. Meisenheimer, C. Papovich, C. Y. PengA. Robaina, S. Sanchez, L. Wisotzki, C. Wolf

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract / Description of output

We explore the history and impact of galaxy mergers and interactions over z similar to 0.24 - 0.80, based on HST ACS, Combo-17, and Spitzer 24 mu m data of similar to 4500 galaxies in the GEMS survey. Using visual and quantitative parameters, we identify galaxies with strong distortions indicative of recent strong interactions and mergers versus normal galaxies (E/S0, Sa, Sb-Sc, Sd/Irr). Our preliminary results are: (1) The observed fraction F of strongly disturbed systems among high mass (M >= 2.5 x 10(10) M-circle dot) galaxies is similar to 9% to 12% in every Gyr bin over z similar to 0.24 - 0.80. The corresponding merger rate is similar to a few x 10(-4) galaxies Gyr(-1) Mpc(-3). The fraction F shows fair agreement with the merger fraction of mass ratio >= 1:10 predicted by several Lambda CDM-based simulations. (2) For M >= 1.0 x 10(9) M-circle dot systems, the average star formation rate (SFR.) of strongly disturbed systems is only modestly enhanced with respect to normal galaxies. In fact, over z similar to 0.24 - 0.8, strongly disturbed systems only account for a small fraction (< 30%) of the total SFR density. This suggest that the behavior of the cosmic SFR density over z similar to 0.24 - 0.80 is predominantly shaped by normal galaxies.

Original language	English
Title of host publication	FORMATION AND EVOLUTION OF GALAXY DISKS
Editors	JG Funes, EM Corsini
Place of Publication	SAN FRANCISCO
Publisher	ASTRONOMICAL SOC PACIFIC
Pages	337-340
Number of pages	4
ISBN (Print)	978-1-58381-662-2
Publication status	Published - 2008
Event	International Conference on Formation and Evolution of Galaxy Disks - Rome Duration: 1 Oct 2007 → 5 Oct 2007

Conference

Conference	International Conference on Formation and Evolution of Galaxy Disks
City	Rome
Period	1/10/07 → 5/10/07

Keywords / Materials (for Non-textual outputs)

STAR-FORMATION
MORPHOLOGY
EVOLUTION
COMBO-17
QUASAR
GEMS

Cite this

Jogee, S., Miller, S., Penner, K., Bell, E. F., Conselice, C., Skelton, R. E., Somerville, R. S., Rix, H.-W., Barazza, F. D., Barden, M., Borch, A., Beckwith, S. V., Caldwell, J. A. R., Haeussler, B., Heymans, C., Jahnke, K., McIntosh, D., Meisenheimer, K., Papovich, C., ... Wolf, C. (2008). Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr. In JG. Funes, & EM. Corsini (Eds.), FORMATION AND EVOLUTION OF GALAXY DISKS (pp. 337-340). ASTRONOMICAL SOC PACIFIC.

@inproceedings{863f89a17fb847b4b03fdee9e87a4397,

title = "Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr",

abstract = "We explore the history and impact of galaxy mergers and interactions over z similar to 0.24 - 0.80, based on HST ACS, Combo-17, and Spitzer 24 mu m data of similar to 4500 galaxies in the GEMS survey. Using visual and quantitative parameters, we identify galaxies with strong distortions indicative of recent strong interactions and mergers versus normal galaxies (E/S0, Sa, Sb-Sc, Sd/Irr). Our preliminary results are: (1) The observed fraction F of strongly disturbed systems among high mass (M >= 2.5 x 10(10) M-circle dot) galaxies is similar to 9% to 12% in every Gyr bin over z similar to 0.24 - 0.80. The corresponding merger rate is similar to a few x 10(-4) galaxies Gyr(-1) Mpc(-3). The fraction F shows fair agreement with the merger fraction of mass ratio >= 1:10 predicted by several Lambda CDM-based simulations. (2) For M >= 1.0 x 10(9) M-circle dot systems, the average star formation rate (SFR.) of strongly disturbed systems is only modestly enhanced with respect to normal galaxies. In fact, over z similar to 0.24 - 0.8, strongly disturbed systems only account for a small fraction (< 30%) of the total SFR density. This suggest that the behavior of the cosmic SFR density over z similar to 0.24 - 0.80 is predominantly shaped by normal galaxies.",

keywords = "STAR-FORMATION, MORPHOLOGY, EVOLUTION, COMBO-17, QUASAR, GEMS",

author = "S. Jogee and S. Miller and K. Penner and Bell, {E. F.} and C. Conselice and Skelton, {R. E.} and Somerville, {R. S.} and H-W. Rix and Barazza, {F. D.} and M. Barden and A. Borch and Beckwith, {S. V.} and Caldwell, {J. A. R.} and B. Haeussler and C. Heymans and K. Jahnke and D. McIntosh and K. Meisenheimer and C. Papovich and Peng, {C. Y.} and A. Robaina and S. Sanchez and L. Wisotzki and C. Wolf",

year = "2008",

language = "English",

isbn = "978-1-58381-662-2",

pages = "337--340",

editor = "JG Funes and EM Corsini",

booktitle = "FORMATION AND EVOLUTION OF GALAXY DISKS",

publisher = "ASTRONOMICAL SOC PACIFIC",

note = "International Conference on Formation and Evolution of Galaxy Disks ; Conference date: 01-10-2007 Through 05-10-2007",

}

Jogee, S, Miller, S, Penner, K, Bell, EF, Conselice, C, Skelton, RE, Somerville, RS, Rix, H-W, Barazza, FD, Barden, M, Borch, A, Beckwith, SV, Caldwell, JAR, Haeussler, B, Heymans, C, Jahnke, K, McIntosh, D, Meisenheimer, K, Papovich, C, Peng, CY, Robaina, A, Sanchez, S, Wisotzki, L & Wolf, C 2008, Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr. in JG Funes & EM Corsini (eds), FORMATION AND EVOLUTION OF GALAXY DISKS. ASTRONOMICAL SOC PACIFIC, SAN FRANCISCO, pp. 337-340, International Conference on Formation and Evolution of Galaxy Disks, Rome, 1/10/07.

TY - GEN

T1 - Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr

AU - Jogee, S.

AU - Miller, S.

AU - Penner, K.

AU - Bell, E. F.

AU - Conselice, C.

AU - Skelton, R. E.

AU - Somerville, R. S.

AU - Rix, H-W.

AU - Barazza, F. D.

AU - Barden, M.

AU - Borch, A.

AU - Beckwith, S. V.

AU - Caldwell, J. A. R.

AU - Haeussler, B.

AU - Heymans, C.

AU - Jahnke, K.

AU - McIntosh, D.

AU - Meisenheimer, K.

AU - Papovich, C.

AU - Peng, C. Y.

AU - Robaina, A.

AU - Sanchez, S.

AU - Wisotzki, L.

AU - Wolf, C.

PY - 2008

Y1 - 2008

N2 - We explore the history and impact of galaxy mergers and interactions over z similar to 0.24 - 0.80, based on HST ACS, Combo-17, and Spitzer 24 mu m data of similar to 4500 galaxies in the GEMS survey. Using visual and quantitative parameters, we identify galaxies with strong distortions indicative of recent strong interactions and mergers versus normal galaxies (E/S0, Sa, Sb-Sc, Sd/Irr). Our preliminary results are: (1) The observed fraction F of strongly disturbed systems among high mass (M >= 2.5 x 10(10) M-circle dot) galaxies is similar to 9% to 12% in every Gyr bin over z similar to 0.24 - 0.80. The corresponding merger rate is similar to a few x 10(-4) galaxies Gyr(-1) Mpc(-3). The fraction F shows fair agreement with the merger fraction of mass ratio >= 1:10 predicted by several Lambda CDM-based simulations. (2) For M >= 1.0 x 10(9) M-circle dot systems, the average star formation rate (SFR.) of strongly disturbed systems is only modestly enhanced with respect to normal galaxies. In fact, over z similar to 0.24 - 0.8, strongly disturbed systems only account for a small fraction (< 30%) of the total SFR density. This suggest that the behavior of the cosmic SFR density over z similar to 0.24 - 0.80 is predominantly shaped by normal galaxies.

AB - We explore the history and impact of galaxy mergers and interactions over z similar to 0.24 - 0.80, based on HST ACS, Combo-17, and Spitzer 24 mu m data of similar to 4500 galaxies in the GEMS survey. Using visual and quantitative parameters, we identify galaxies with strong distortions indicative of recent strong interactions and mergers versus normal galaxies (E/S0, Sa, Sb-Sc, Sd/Irr). Our preliminary results are: (1) The observed fraction F of strongly disturbed systems among high mass (M >= 2.5 x 10(10) M-circle dot) galaxies is similar to 9% to 12% in every Gyr bin over z similar to 0.24 - 0.80. The corresponding merger rate is similar to a few x 10(-4) galaxies Gyr(-1) Mpc(-3). The fraction F shows fair agreement with the merger fraction of mass ratio >= 1:10 predicted by several Lambda CDM-based simulations. (2) For M >= 1.0 x 10(9) M-circle dot systems, the average star formation rate (SFR.) of strongly disturbed systems is only modestly enhanced with respect to normal galaxies. In fact, over z similar to 0.24 - 0.8, strongly disturbed systems only account for a small fraction (< 30%) of the total SFR density. This suggest that the behavior of the cosmic SFR density over z similar to 0.24 - 0.80 is predominantly shaped by normal galaxies.

KW - STAR-FORMATION

KW - MORPHOLOGY

KW - EVOLUTION

KW - COMBO-17

KW - QUASAR

KW - GEMS

M3 - Conference contribution

SN - 978-1-58381-662-2

SP - 337

EP - 340

BT - FORMATION AND EVOLUTION OF GALAXY DISKS

A2 - Funes, JG

A2 - Corsini, EM

PB - ASTRONOMICAL SOC PACIFIC

CY - SAN FRANCISCO

T2 - International Conference on Formation and Evolution of Galaxy Disks

Y2 - 1 October 2007 through 5 October 2007

ER -

Frequency and Impact of Galaxy Mergers and Interactions over the Last 7 Gyr

Abstract / Description of output

Conference

Keywords / Materials (for Non-textual outputs)

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