Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution
We present ∼0″5 resolution near-infrared integral field spectroscopy of the Hα line emission of 14 z ∼ 2 UV-selected BM/BX galaxies, obtained with SINFONI at the ESO Very Large Telescope. The average Hα half-light radius is r1/2 ≈4 h70-1 kpc, and line emission is detected over ≳20 h70-1 kpc in sever...
| Váldodahkkit: | , , , , , , , , , , , , , , , , |
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| Materiálatiipa: | Journal article |
| Giella: | English |
| Almmustuhtton: |
2006
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| _version_ | 1826304082550194176 |
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| author | Förster Schreiber, N Genzei, R Lehnert, MD Bouché, N Verma, A Erb, D Shapley, A Steidel, C Davies, R Lutz, D Nesvadba, N Tacconi, L Eisenhauer, F Abuter, R Gilbert, A Gillessen, S Sternberg, A |
| author_facet | Förster Schreiber, N Genzei, R Lehnert, MD Bouché, N Verma, A Erb, D Shapley, A Steidel, C Davies, R Lutz, D Nesvadba, N Tacconi, L Eisenhauer, F Abuter, R Gilbert, A Gillessen, S Sternberg, A |
| author_sort | Förster Schreiber, N |
| collection | OXFORD |
| description | We present ∼0″5 resolution near-infrared integral field spectroscopy of the Hα line emission of 14 z ∼ 2 UV-selected BM/BX galaxies, obtained with SINFONI at the ESO Very Large Telescope. The average Hα half-light radius is r1/2 ≈4 h70-1 kpc, and line emission is detected over ≳20 h70-1 kpc in several sources. In nine galaxies, we detect spatially resolved velocity gradients, from 40 to 410 km s-1 over ∼10 h70-1 kpc. The kinematics of the larger systems are generally consistent with orbital motions. Four galaxies are well described by rotating clumpy disks, and we extracted rotation curves out to radii ≳10 h 70-1 kpc. One or two galaxies exhibit signatures more consistent with mergers. Analyzing all 14 galaxies in the framework of rotating disks, we infer mean inclination- and beam-corrected maximum circular velocities of vc ∼ 180 ± 90 km s-1 and dynamical masses from ∼0.5 to 25 × 1010 h70-1 M ⊙ within r1/2- The specific angular momenta of our BM/BX galaxies are similar to those of local late-type galaxies. Moreover, the specific angular momenta of their baryons are comparable to those of their dark matter halos. Extrapolating from the average vc at 10 h 70-1 kpc, the virial mass of the typical halo of a galaxy in our sample is 1011.7±0.5 h70-1 M ⊙. Kinematic modeling of the three best cases implies a ratio of vc to local velocity dispersion vc/σ ∼ 2-4 and, accordingly, a large geometric thickness. We argue that this suggests a mass accretion (alternatively, gas exhaustion) timescale of ∼500 Myr. We also argue that if our BM/BX galaxies were initially gas-rich, their clumpy disks would subsequently lose their angular momentum and form compact bulges on a timescale of ∼1 Gyr. © 2006. The American Astronomical Socieity. All rights reserved. |
| first_indexed | 2024-03-07T06:12:24Z |
| format | Journal article |
| id | oxford-uuid:eff9976b-18d3-479d-b1bd-f70eb3c76af4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:12:24Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:eff9976b-18d3-479d-b1bd-f70eb3c76af42022-03-27T11:44:19ZSinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolutionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:eff9976b-18d3-479d-b1bd-f70eb3c76af4EnglishSymplectic Elements at Oxford2006Förster Schreiber, NGenzei, RLehnert, MDBouché, NVerma, AErb, DShapley, ASteidel, CDavies, RLutz, DNesvadba, NTacconi, LEisenhauer, FAbuter, RGilbert, AGillessen, SSternberg, AWe present ∼0″5 resolution near-infrared integral field spectroscopy of the Hα line emission of 14 z ∼ 2 UV-selected BM/BX galaxies, obtained with SINFONI at the ESO Very Large Telescope. The average Hα half-light radius is r1/2 ≈4 h70-1 kpc, and line emission is detected over ≳20 h70-1 kpc in several sources. In nine galaxies, we detect spatially resolved velocity gradients, from 40 to 410 km s-1 over ∼10 h70-1 kpc. The kinematics of the larger systems are generally consistent with orbital motions. Four galaxies are well described by rotating clumpy disks, and we extracted rotation curves out to radii ≳10 h 70-1 kpc. One or two galaxies exhibit signatures more consistent with mergers. Analyzing all 14 galaxies in the framework of rotating disks, we infer mean inclination- and beam-corrected maximum circular velocities of vc ∼ 180 ± 90 km s-1 and dynamical masses from ∼0.5 to 25 × 1010 h70-1 M ⊙ within r1/2- The specific angular momenta of our BM/BX galaxies are similar to those of local late-type galaxies. Moreover, the specific angular momenta of their baryons are comparable to those of their dark matter halos. Extrapolating from the average vc at 10 h 70-1 kpc, the virial mass of the typical halo of a galaxy in our sample is 1011.7±0.5 h70-1 M ⊙. Kinematic modeling of the three best cases implies a ratio of vc to local velocity dispersion vc/σ ∼ 2-4 and, accordingly, a large geometric thickness. We argue that this suggests a mass accretion (alternatively, gas exhaustion) timescale of ∼500 Myr. We also argue that if our BM/BX galaxies were initially gas-rich, their clumpy disks would subsequently lose their angular momentum and form compact bulges on a timescale of ∼1 Gyr. © 2006. The American Astronomical Socieity. All rights reserved. |
| spellingShingle | Förster Schreiber, N Genzei, R Lehnert, MD Bouché, N Verma, A Erb, D Shapley, A Steidel, C Davies, R Lutz, D Nesvadba, N Tacconi, L Eisenhauer, F Abuter, R Gilbert, A Gillessen, S Sternberg, A Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution |
| title | Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution |
| title_full | Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution |
| title_fullStr | Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution |
| title_full_unstemmed | Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution |
| title_short | Sinfoni integral field spectroscopy of z ∼ 2 UV-selected galaxies: Rotation curves and dynamical evolution |
| title_sort | sinfoni integral field spectroscopy of z ∼ 2 uv selected galaxies rotation curves and dynamical evolution |
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