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IMAGES I. Strong evolution of galaxy kinematics since z=1 | | Y.Yang
; H.Flores
; F.Hammer
; B.Neichel
; M.Puech
; N.Nesvadba
; A.Rawat
; C.Cesarsky
; M.Lehnert
; L.Pozzetti
; I.Fuentes-Carrera
; P.Amram
; C.Balkowski
; H.Dannerbauer
; S.diSeregoAlighieri
; B.Guiderdoni
; A.Kembhavi
; Y.C.Liang
; G. Östlin
; C.D.Ravikumar
; D.Vergani
; J.Vernet
; H.Wozniak
; | | Date: |
14 Nov 2007 | | Abstract: | (abbreviated) We present the first results of the ESO large program,
’’IMAGES’’ which aims at obtaining robust measurements of the kinematics of
distant galaxies using the multi-IFU mode of GIRAFFE on the VLT. 3D
spectroscopy is essential to robustly measure the often distorted kinematics of
distant galaxies (e.g., Flores et al. 2006). We derive the velocity fields and
$sigma$-maps of 36 galaxies at 0.4<z<0.75 from the kinematics of the [OII]
emission line doublet, and generate a robust technique to identify the nature
of the velocity fields based on the pixels of the highest signal-to-noise
ratios (S/N). We have gathered a unique sample of 63 velocity fields of
emission line galaxies (W0([OII]) > 15 A) at z=0.4-0.75, which are a
representative subsample of the population of M_stellar>1.5x10^{10} M_sun
emission line galaxies in this redshift range, and are largely unaffected by
cosmic variance. Taking into account all galaxies -with or without emission
lines- in that redshift range, we find that at least 41+/-7% of them have
anomalous kinematics, i.e., they are not dynamically relaxed. This includes
26+/-7% of distant galaxies with complex kinematics, i.e., they are not simply
pressure or rotationally supported. Our result implies that galaxy kinematics
are among the most rapidly evolving properties, because locally, only a few
percent of the galaxies in this mass range have complex kinematics. | | Source: | arXiv, 0711.2305 | | Services: | Forum | Review | PDF | Favorites | |
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