Bibcode
Borlaff, A.; Eliche-Moral, M. Carmen; Rodríguez-Pérez, Cristina; Querejeta, Miguel; Tapia, Trinidad; Pérez-González, Pablo G.; Zamorano, Jaime; Gallego, Jesús; Beckman, J. E.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 570, id.A103, 30 pp.
Advertised on:
10
2014
Revista
Número de citas
58
Número de citas referidas
54
Descripción
Context. Lenticular galaxies (S0s) are more likely to host antitruncated
(Type III) stellar discs than galaxies of later Hubble types. Major
mergers are popularly considered too violent to make these breaks. Aims: We have investigated whether major mergers can result into
S0-like remnants with realistic antitruncated stellar discs or not. Methods: We have analysed 67 relaxed S0 and E/S0 remnants resulting
from dissipative N-body simulations of major mergers from the GalMer
database. We have simulated realistic R-band surface brightness profiles
of the remnants to identify those with antitruncated stellar discs.
Their inner and outer discs and the breaks have been quantitatively
characterized to compare with real data. Results: Nearly 70% of
our S0-like remnants are antitruncated, meaning that major mergers that
result in S0s have a high probability of producing Type III stellar
discs. Our remnants lie on top of the extrapolations of the
observational trends (towards brighter magnitudes and higher break
radii) in several photometric diagrams, because of the higher
luminosities and sizes of the simulations compared to observational
samples. In scale-free photometric diagrams, simulations and
observations overlap and the remnants reproduce the observational
trends, so the physical mechanism after antitruncations is highly
scalable. We have found novel photometric scaling relations between the
characteristic parameters of the antitruncations in real S0s, which are
also reproduced by our simulations. We show that the trends in all the
photometric planes can be derived from three basic scaling relations
that real and simulated Type III S0s fulfill: hi ∝
RbrkIII, ho ∝ RbrkIII, and
μbrkIII ∝ RbrkIII, where hi and
ho are the scalelengths of the inner and outer discs, and
μbrkIII and RbrkIII are the surface brightness
and radius of the breaks. Bars and antitruncations in real S0s are
structurally unrelated phenomena according to the studied photometric
planes. Conclusions: Major mergers provide a feasible mechanism
to form realistic antitruncated S0 galaxies.
Table 3 is available in electronic form at http://www.aanda.org
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