Bibcode
Borlaff, A.; Eliche-Moral, M. Carmen; Beckman, J. E.; Pérez-González, P. G.; Font, J.
Referencia bibliográfica
Formation and Evolution of Galaxy Outskirts, Proceedings of the International Astronomical Union, IAU Symposium, Volume 321, pp. 280-280
Fecha de publicación:
3
2017
Número de citas
0
Número de citas referidas
0
Descripción
Lenticular galaxies (S0s) are more likely to host anti-truncated (Type
III) stellar discs than galaxies of later Hubble types. Previous work on
Type-III S0s at z = 0 revealed that the characteristic parameters of the
breaks obey tight scaling relations (Borlaff et al. 2014). These
relation are similar in both S0's and spirals, in optical and NIR, and
for barred and non-barred galaxies (Eliche-Moral et al. 2015). We have
analysed 3DHST images (Brammer et al. 2012) of S0 galaxies from the
SHARDS survey (Pérez-González et al. 2013) in order to
investigate if E/S0 and S0 galaxies with anti-truncated stellar profiles
up to z ~ 0.6 follow similar scaling relations compared to the local
sample. We find that the characteristic photometric parameters of
Type-III S0s at 0.4 < z < 0.6 obey analogous scaling relations to
those observed in their local counterparts, lying on top of the
extrapolations of the local trends towards brighter magnitudes in
several photometric diagrams and sharing similar trends and values in
the h i - R brkIII, h o - R
brkIII and h i - h o diagrams. We have
measured the offsets in magnitudes between two subsets of the z ~ 0.5
and z = 0 samples with similar masses (log 10 M/M
⊙ ~ 10.7). The median offsets are:
ΔμbrkIII = - 2.23+0.46 -0.62,
Δμ0, i = - 2.61+0.31 -0.26 and
Δμ0, o = - 2.31+0.57 -0.78 mag
arcsec-2. We find that PSF corrections in our images do not
significantly affect the scaling relations obtained in our 0.2 < z
< 0.6 sample. In conclusion, the existence of similar scaling
relations in Type-III S0 discs since z ~ 0.6 implies that the structures
of the inner and outer discs in anti-truncated S0s have been similarly
linked in the last ~ 6 Gyr, posing strong constraints to the processes
proposed to explain their formation.