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The intriguing life of star-forming galaxies in the redshift range 1 ≤ z ≤ 2 using MASSIV

  • P. Amram (a1), C. López-Sanjuan (a1) (a2), B. Epinat (a1), T. Contini (a3), D. Vergani (a4), L. Tasca (a1), O. Le Fèvre (a1), B. Garilli (a5), C. Divoy (a3), J. Queyrel (a3), M. Kissler-Patig (a6) (a7), J. Moultaka (a3), L. Paioro (a5), L. Tresse (a1), V. Perret (a1) and F. Bournaud (a8)...

Abstract

MASSIV (Mass Assembly Survey with SINFONI in VVDS) is an ESO large program which consists of 84 star-forming galaxies, spanning a wide range of stellar masses, observed with the IFU SINFONI on the VLT, in the redshift range 1 ≤ z ≤ 2. To be representative of the normal galaxy population, the sample has been selected from a well-defined, complete and representative parent sample. The kinematics of individual galaxies reveals that 58% of the galaxies are slow rotators, which means that a high fraction of these galaxies should probably be formed through major merger processes which might have produced gaseous thick or spheroidal structures supported by velocity dispersion rather than by rotation. Computations on the major merger rate from close pairs indicate that a typical star-forming galaxy underwent ~0.4 major mergers in the last ~9.5 Gyr, showing that merging is a major process driving mass assembly into the red sequence galaxies. These objects are also intriguing due to the fact that more than one galaxy over four is more metal-rich in its outskirts than in its center.

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References

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