Detalles de publicación
PP 018025
Evolution of the anti-truncated stellar profiles of S0 galaxies since z = 0.6 in the SHARDS survey. II - Structural and photometric evolution-
1 Instituto de Astrofísica de Canarias, C/ Vía Láctea, E-38200 La Laguna, Tenerife, Spain e-mail: asborlaff@iac.es
2 Departamento de Astrofísica y CC. de la Atmósfera, Universidad Complutense de Madrid, E-28040 Madrid, Spain
3 Facultad de Física, Universidad de La Laguna, Avda. Astrofísico Fco. Sánchez s/n, 38200, La Laguna, Tenerife, Spain
4 Consejo Superior de Investigaciones Científicas, Spain
5 Observatoire de Paris, LERMA, PSL Research University, 61 Avenue de l’Observatoire, 75014, Paris, France
6 University of California, 501 Campbell Hall, Berkeley, CA 94720 Santa Cruz, USA
7 Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Versoix, Switzerland
Context. Anti-truncated lenticular galaxies (Type-III S0s) present tight scaling relations between their surface brightness photometric
and structural parameters. Although several evolutionary models have been proposed for the formation of these structures, the
observations of Type-III S0 galaxies are usually limited to the local Universe.
Aims. We aim to compare the properties of Type-III discs in a sample of S0 galaxies at 0.2 < z < 0.6 with those of the local Universe.
In this paper, we study the evolution of the photometric and structural scaling relations measured in the rest-frame R−band with z and
the possible differences between the rest-frame (B − R) colours of the inner and outer disc profiles.
Methods. We make use of a sample of 14 Type-III E/S0–S0 galaxies at 0.2 < z < 0.6 from the GOODS-N field identified and
characterised in a previous paper. We study if the correlations found in local Type-III S0 galaxies were present ∼ 6 Gyr ago. We
analyse the distribution of the surface brightness characteristic parameters (Rbreak, µbreak, hi
, ho, µ0,i and µ0,o) as a function of the stellar
mass and if there is a significant change with z. We also derive their rest-frame (B − R) colour profiles. Finally, we compare these
results with the predictions from a grid of SSP models.
Results. We find that the inner and outer scale-lengths of Type-III S0 galaxies at 0.4 < z < 0.6 follow compatible trends and scaling
relations with those observed in local S0 galaxies as a function of the break radius, Rbreak. We do not detect any significant differences
between the location of Rbreak between z ∼ 0.6 and z ∼ 0 for a fixed stellar mass of the object, whereas the surface brightness at the
break radius µbreak is ∼ 1.5 mag arcsec−2 dimmer in the local Universe than at z ∼ 0.6 for a fixed stellar mass. We find no significant
differences in the (B − R) colour between the inner and outer profiles of the Type-III S0 galaxies at 0.2 < z < 0.6.
Conclusions. In contrast to Type-II (down-bending) profiles, the anti-truncated surface brightness profiles of S0 galaxies present
compatible Rbreak values and scaling relations during the last 6 Gyr. This result and the similarity of the colours of the inner and outer
discs point to a highly scalable and stable formation process, probably more related to gravitational and dynamical processes than to
the evolution of stellar populations.
and structural parameters. Although several evolutionary models have been proposed for the formation of these structures, the
observations of Type-III S0 galaxies are usually limited to the local Universe.
Aims. We aim to compare the properties of Type-III discs in a sample of S0 galaxies at 0.2 < z < 0.6 with those of the local Universe.
In this paper, we study the evolution of the photometric and structural scaling relations measured in the rest-frame R−band with z and
the possible differences between the rest-frame (B − R) colours of the inner and outer disc profiles.
Methods. We make use of a sample of 14 Type-III E/S0–S0 galaxies at 0.2 < z < 0.6 from the GOODS-N field identified and
characterised in a previous paper. We study if the correlations found in local Type-III S0 galaxies were present ∼ 6 Gyr ago. We
analyse the distribution of the surface brightness characteristic parameters (Rbreak, µbreak, hi
, ho, µ0,i and µ0,o) as a function of the stellar
mass and if there is a significant change with z. We also derive their rest-frame (B − R) colour profiles. Finally, we compare these
results with the predictions from a grid of SSP models.
Results. We find that the inner and outer scale-lengths of Type-III S0 galaxies at 0.4 < z < 0.6 follow compatible trends and scaling
relations with those observed in local S0 galaxies as a function of the break radius, Rbreak. We do not detect any significant differences
between the location of Rbreak between z ∼ 0.6 and z ∼ 0 for a fixed stellar mass of the object, whereas the surface brightness at the
break radius µbreak is ∼ 1.5 mag arcsec−2 dimmer in the local Universe than at z ∼ 0.6 for a fixed stellar mass. We find no significant
differences in the (B − R) colour between the inner and outer profiles of the Type-III S0 galaxies at 0.2 < z < 0.6.
Conclusions. In contrast to Type-II (down-bending) profiles, the anti-truncated surface brightness profiles of S0 galaxies present
compatible Rbreak values and scaling relations during the last 6 Gyr. This result and the similarity of the colours of the inner and outer
discs point to a highly scalable and stable formation process, probably more related to gravitational and dynamical processes than to
the evolution of stellar populations.