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

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dc.creatorJogee, S.
dc.creatorMiller, S.
dc.creatorPenner, K.
dc.creatorBell, E. F.
dc.creatorConselice, C.
dc.creatorSkelton, R. E.
dc.creatorSomerville, R.
dc.creatorRix, H-W.
dc.creatorBarazza, F. D.
dc.creatorBarden, M.
dc.creatorBorch, A.
dc.creatorBeckwith, S. V.
dc.creatorCaldwell, J. A.
dc.creatorHaussler, B.
dc.creatorHeymans, C.
dc.creatorJahnke, K.
dc.creatorMcIntosh, D.
dc.creatorMeisenheimer, K.
dc.creatorPapovich, C.
dc.creatorPeng, C.
dc.creatorRobaina, A.
dc.creatorSanchez, S.
dc.creatorWisotzki, L.
dc.creatorWolf, C.
dc.date2008-02-26
dc.date.accessioned2026-07-07T09:23:30Z
dc.date.available2026-07-07T09:23:30Z
dc.descriptionWe explore the history and impact of galaxy mergers and interactions over z~0.24 to 0.80, based on HST ACS, Combo-17, and Spitzer 24 mu data of ~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 results are: (1) The observed fraction F of strongly disturbed systems among high mass (M>=2.5E10 Msun) galaxies is ~9% to 12% in every Gyr bin over z~0.24 to 0.80. The corresponding merger rate is a few times 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 LCDM-based simulations. (2) For M>=1E9 Msun systems, the average star formation rate (SFR) of strongly disturbed systems is only modestly enhanced with respect to normal galaxies, in agreement with recent simulations. In fact, over z~0.24 to 0.80, strongly disturbed systems only account for a small fraction (<~30%) of the total SFR density. This suggests that the behaviour of the cosmic SFR density over the last seven billion years is predominantly shaped by normal galaxies.
dc.descriptionTo appear in Proceedings of "Formation and Evolution of Galaxy Disks", held in Rome, 1-5 October 2007. 4 pages, 4 figures. Uses asp2006.sty, graphicx.sty psfig.sty
dc.identifierhttps://arxiv.org/abs/0802.3901
dc.identifierhttp://arxiv.org/abs/0802.3901
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155758
dc.subjectAstrophysics
dc.titleFrequency and Impact of Galaxy Mergers and Interactions over the last 7 Gyr
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