The Hubble sequence: just a vestige of merger events - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Abr: We investigate whether the Hubble sequence can be reproduced by therelics of merger events. We verify that, at zmed=0.65, the abundant populationof anomalous starbursts is mainly linked to the local spirals. Theirmorphologies are dominated by young stars and are related to their ionised-gaskinematics. We show that both morphologies and kinematics can be reproduced byusing gas modelling from Barnes- 2002 study of major mergers. Using ourmodelling to estimate the gas-to-stars transformation during a merger, weidentify the gas fraction in the progenitors to be generally above 50%. Alldistant and massive starbursts can be distributed along a temporal sequencefrom the first passage to the nuclei fusion and then to the disk rebuildingphase. It confirms that the rebuilding spiral disk scenario is possibly animportant channel for the formation of present-day disks in spirals. Becausehalf of the present-day spirals had peculiar morphologies and anomalouskinematics at zmed=0.65, they could indeed be in major mergers phases 6 Gyrsago, and almost all at z~1. It is time now to study in detail the formation ofspiral disks and of their substructures, including bulge, disks, arms, bars,rings that may mainly originate from instabilities created during the lastmajor merger.



Autor: F. Hammer 1, H. Flores 1, M. Puech 1, Y. Yang 1, E. Athanassoula 2, M. Rodrigues 1, R. Delgado-Serrano 1, 1 GEPI Observatoire de

Fuente: https://arxiv.org/







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