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Evolution of the anti-truncated stellar profiles of S0 galaxies since z=0.6 in the SHARDS survey

Published online by Cambridge University Press:  21 March 2017

Alejandro Borlaff
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, email: [email protected] Facultad de Física, Universidad de La Laguna, Spain Departamento de Astrofísica y CC. de la Atmósfera, Univ. Complutense de Madrid, Spain
M. Carmen Eliche-Moral
Affiliation:
Departamento de Astrofísica y CC. de la Atmósfera, Univ. Complutense de Madrid, Spain
John Beckman
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, email: [email protected] Facultad de Física, Universidad de La Laguna, Spain Consejo Superior de Investigaciones Científicas, Spain
Pablo G. Pérez-González
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, email: [email protected]
Joan Font
Affiliation:
Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, email: [email protected] Facultad de Física, Universidad de La Laguna, Spain
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Abstract

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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 hiRbrkIII, hoRbrkIII and hiho diagrams. We have measured the offsets in magnitudes between two subsets of the z ~ 0.5 and z = 0 samples with similar masses (log 10M/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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

References

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