GIRAFFE multiple integral field units at VLT: a unique tool to recover velocity fields of distant galaxies

Abstract

The GIRAFFE spectrograph is unique in providing the integral field spectroscopy of fifteen distant galaxies at the same time. It has been successfully implemented at the second VLT unit within the FLAMES facility. We present GIRAFFE observations acquired during the Guaranteed Time Observation of the Paris Observatory, using total exposure times ranging from 6 to 12 hours. The reduced 3D cube of each galaxy has been deconvolved using our new package DisGal3D. This software has been written using the only assumption that UV light traces the emission line regions. The comparison between GIRAFFE spectra and HST imagery allows us to recover details on velocity fields as small as 0.3-0.4 arcsec. It has been successfully tested using Fabry Perot observations of nearby galaxies purposely redshifted to large distances. We present here preliminary results for three distant galaxies at 0.45< z < 0.65, whose velocity fields have been derived with exquisite spectral (R=10000) and spatial resolutions. Observed velocity fields range from disturbed fields expected in major merger events to those of regular spiral with minor perturbations. For the latter, one could accurately derive the dynamical major axis and the maximal rotational velocity. We conclude that dynamical properties of a large number of distant galaxies can be routinely derived at VLT. This opens a new avenue towards the understanding of the galaxy formation and evolution during the last 8 Gyr.

arXiv comment4 pages, 3 jpeg figures. to appear in A&A

References in corpus (16)

• The CANADA-FRANCE REDSHIFT SURVEY XIII: The luminosity density and star-formation history of the Universe to z ~ 1
• Hubble Space Telescope imaging of the CFRS and LDSS redshift surveys - IV. Influence of mergers in the evolution of faint field galaxies from z~1
• The cosmological origin of the Tully-Fisher relation
• HST imaging of CFRS and LDSS galaxies - I: Morphological Properties
• Dynamics of blue compact galaxies, as revealed by their H$\alpha$ velocity fields II. Mass models and the starburst triggering mechanism
• The Tully-Fisher relation at intermediate redshift
• Biconical Outflow in the Seyfert Galaxy NGC 2992
• Luminous compact galaxies at intermediate redshifts: progenitors of bulges of massive spirals ?
• Internal Kinematics of Galaxies at z=0.25-0.45
• HST/WFPC2 morphologies and color maps of distant luminous infrared galaxies
• The Luminosity-Metallicity Relation of distant luminous infrared galaxies
• Star formation rates of distant luminous infrared galaxies derived from Halpha and IR luminosities
• Dynamical effects of interactions and the Tully-Fisher relation for Hickson compact groups
• No Hubble Bubble in the Local Universe
• Galaxies Under the Cosmic Microscope: A GMOS Study of the Lensed Disk-Galaxy #289 in A2218
• A backwards approach to the formation of disk galaxies I. Stellar and gas content

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• 3D spectroscopy with VLT/GIRAFFE - II: Are Luminous Compact Galaxies merger remnants ?
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• Predictions and Strategies for Integral-Field Spectroscopy of High-Redshift Galaxies
• 3D spectroscopy with VLT/GIRAFFE - III: Mapping electron densities in distant galaxies
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