FROM RINGS TO BULGES: EVIDENCE FOR RAPID SECULAR GALAXY EVOLUTION AT z ∼ 2 FROM INTEGRAL FIELD SPECTROSCOPY IN THE SINS SURVEY

被引：552

作者：

Genzel, R. ^{[1
,2
]}

Burkert, A. ^{[3
]}

Bouche, N. ^{[1
]}

Cresci, G. ^{[1
]}

Schreiber, N. M. Foerster ^{[1
]}

Shapley, A. ^{[4
]}

Shapiro, K. ^{[5
]}

Tacconi, L. J. ^{[1
]}

Buschkamp, P. ^{[1
]}

Cimatti, A. ^{[6
]}

Daddi, E. ^{[7
]}

Davies, R. ^{[1
]}

Eisenhauer, F. ^{[1
]}

Erb, D. K. ^{[8
]}

Genel, S. ^{[1
]}

Gerhard, O. ^{[1
]}

Hicks, E. ^{[1
]}

Lutz, D. ^{[1
]}

Naab, T. ^{[3
]}

Ott, T. ^{[1
]}

Rabien, S. ^{[1
]}

Renzini, A. ^{[9
]}

Steidel, C. C. ^{[10
]}

Sternberg, A. ^{[11
]}

Lilly, S. J. ^{[12
]}

机构：

[1] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] USM, D-81679 Munich, Germany

[4] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[6] Ist Nazl Astrofis Osservatorio Astron Bologna, I-40129 Bologna, Italy

[7] Dapnia CEA, Serv Astrophys, Saclay, France

[8] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[9] Osserv Astron Padova, I-35122 Padua, Italy

[10] CALTECH, Pasadena, CA 91125 USA

[11] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[12] ETH, Inst Astron, Dept Phys, CH-8093 Zurich, Switzerland

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 687卷 / 01期

关键词：

cosmology: observations; galaxies: evolution; galaxies: high-redshift; infrared: galaxies;

D O I：

10.1086/591840

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present H alpha integral field spectroscopy of well-resolved, UV/optically selected z similar to 2 star-forming galaxies as part of the SINS survey with SINFONI on the ESO VLT. Our laser guide star adaptive optics and good seeing data show the presence of turbulent rotating star-forming outer rings/disks, plus central bulge/inner disk components, whose mass fractions relative to the total dynamical mass appear to scale with the [N II]/H alpha flux ratio and the star formation age. We propose that the buildup of the central disks and bulges of massive galaxies at z similar to 2 can be driven by the early secular evolution of gas-rich proto-disks. High-redshift disks exhibit large random motions. This turbulence may in part be stirred up by the release of gravitational energy in the rapid "cold" accretion flows along the filaments of the cosmic web. As a result, dynamical friction and viscous processes proceed on a timescale of < 1 Gyr, at least an order of magnitude faster than in z similar to 0 disk galaxies. Early secular evolution thus drives gas and stars into the central regions and can build up exponential disks and massive bulges, even without major mergers. Secular evolution along with increased efficiency of star formation at high surface densities may also help to account for the short timescales of the stellar buildup observed in massive galaxies at z similar to 2.

引用

页码：59 / 77

页数：19

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