That is, their bulges may have formed through “dry†major-merger events involving SMBHs while their disk was subsequently built up via cold gas accretion scenarios. Contrary to the traditionally proposed lenticular galaxy formation mechanisms such as ram-pressure stripping and galaxy harassment, the mass deficits in these galaxies suggest a two stage inside-out process for their assembly.
We quantify these deficits for a sample of five luminous lenticular galaxies with bulge magnitude MV ≲ -21 mag and find Mdef ≠0.5 - 2MBH (black hole mass).
The centers of giant galaxies display stellar mass deficits (Mdef) which are thought to be a signature left by inspiraling supermassive black hole (SMBH) binaries that are formed in post-merger galaxies. ram-pressure stripping).Ĭentral Stellar Mass Deficits in the Bulges of Local Lenticular Galaxies This explains the mismatch in angular momentum and concentration between spirals and lenticulars recently revealed by CALIFA observations, which is hard to reconcile with simple fading mechanisms (e.g.
Moreover, we show that mergers simultaneously increase the light concentration and reduce the angular momentum relative to their spiral progenitors. Here, we summarise our recent work in which we have shown, through N-body numerical simulations, that disc-dominated lenticulars can emerge from major mergers of spiral galaxies, in good agreement with observational photometric scaling relations. photometric bulge-disc coupling) seemed to rule out a potential merger origin. While galaxy mergers are obvious pathways to suppress star formation and increase bulge sizes, the marked parallelism between spiral and lenticular galaxies (e.g. Lenticular galaxies (S0s) represent the majority of early-type galaxies in the local Universe, but their formation channels are still poorly understood. Carmen Tapia, Trinidad Borlaff, Alejandro van de Ven, Glenn Lyubenova, Mariya Martig, Marie Falcón-Barroso, Jesús Méndez-Abreu, Jairo Zamorano, Jaime Gallego, Jesús Creating lenticular galaxies with mergers
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