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Images IV: Strong evolution of the oxygen abundance in gaseous phases of intermediate mass galaxies since z=0.8 | | M. Rodrigues
; F. Hammer
; H.Flores
; M. Puech
; Y.C. Liang
; I. Fuentes-Carrera
; N. Nesvadba
; M. Lehnert
; Y. Yang
; P. Amram
; C. Balkowski
; C. Cesarsky
; H.Dannerbauer
; R. Delgado
; B. Guiderdoni
; A. Kembhavi
; B. Neichel
; G. Östlin
; L. Pozzetti
; C.D. Ravikumar
; A. Rawat
; S. di Serego Alighieri
; D. Vergani
; J. Vernet
; H. Wozniak
; | | Date: |
2 Oct 2008 | | Abstract: | Intermediate mass galaxies (logM(Msun)>10) at z~0.6 are the likeliest
progenitors of the present-day numerous population of spirals. There is growing
evidence that they have evolved rapidly since the last 6 to 8 Gyr ago, and
likely have formed a significant fraction of their stellar mass, often showing
perturbed morphologies and kinematics. We have gathered a representative sample
of 88 such galaxies and have provided robust estimates of their gas phase
metallicity. For doing so, we have used moderate spectral resolution
spectroscopy at VLT/FORS2 with unprecedented high S/N allowing to remove biases
coming from interstellar absorption lines and extinction to establish robust
values of R23=([OII]3727 + [OIII]4959,5007)/Hbeta. We definitively confirm that
the predominant population of z~0.6 starbursts and luminous IR galaxies (LIRGs)
are on average, two times less metal rich than the local galaxies at a given
stellar mass. We do find that the metal abundance of the gaseous phase of
galaxies is evolving linearly with time, from z=1 to z=0 and after comparing
with other studies, from z=3 to z=0. Combining our results with the reported
evolution of the Tully Fisher relation, we do find that such an evolution
requires that ~30% of the stellar mass of local galaxies have been formed
through an external supply of gas, thus excluding the close box model. Distant
starbursts & LIRGs have properties (metal abundance, star formation efficiency
& morphologies) similar to those of local LIRGs. Their underlying physics is
likely dominated by gas infall probably through merging or interactions. Our
study further supports the rapid evolution of z~0.4-1 galaxies. Gas exchanges
between galaxies is likely the main cause of this evolution. | | Source: | arXiv, 0810.0272 | | Services: | Forum | Review | PDF | Favorites | |
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