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17 novembre 2017 Tout le mois

Mathieu Puech (GEPI) — Rotating discs vs. mergers at z 1 : is there really a disc survival issue in LCDM ?

Vendredi 17 novembre 11:00-12:00 - Amphi

Discs represent 70% of local massive spirals. Such a large fraction has been suggested to be in tension with the relatively high occurrence rate of major mergers at higher redshifts in LCDM, which has been dubbed as the "disc survival issue". Observations of the spatially-resolved kinematics and the high resolution morphology of their progenitors at z=0.6-1.2 suggest that gas-rich mergers is a viable solution to this issue. I will review observational evidences for this with a particular focus on the counter-arguments that have been discussed in the community, e.g., the existence of a main sequence of star forming galaxies, the large fraction of (U)LIRGs with spiral morphologies, the low fraction of the SFR attributed to major mergers, or the large fraction of spiral galaxies with no classical bulges (ie, pseudo-bulges and bulgeless). I will show that none of these arguments are actually valuable counter-proofs of the prominent role of gas-rich major mergers in shaping a large fraction of local spiral galaxies. Finally, I will discuss the current and future reliability of rotation curve measurements in distant galaxies, focusing in particular on MOSAIC, the future ELT multi-object spectrograph.

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