TY - JOUR
T1 - No direct coupling between bending of galaxy disc stellar age and light profiles
AU - Ruiz-Lara, T.
AU - Pérez, I.
AU - Florido, E.
AU - Sánchez-Blázquez, P.
AU - Méndez-Abreu, J.
AU - Lyubenova, M.
AU - Falcón-Barroso, J.
AU - Sánchez-Menguiano, L.
AU - Sánchez, S. F.
AU - Galbany, L.
AU - García-Benito, R.
AU - González Delgado, R. M.
AU - Husemann, B.
AU - Kehrig, C.
AU - López-Sańchez, Ańgel R.
AU - Marino, R. A.
AU - Mast, D.
AU - Papaderos, P.
AU - Van De Ven, G.
AU - Walcher, C. J.
AU - Zibetti, S.
AU - CALIFA team
PY - 2016/2/11
Y1 - 2016/2/11
N2 - We study the stellar properties of 44 face-on spiral galaxies from the Calar Alto Legacy Integral Field Area survey via full spectrum fitting techniques. We compare the age profiles with the surface brightness distribution in order to highlight differences between profile types (type I, exponential profile; and II, down-bending profile). We observe an upturn ('U-shape') in the age profiles for 17 out of these 44 galaxies with reliable stellar information up to their outer parts. This 'U-shape' is not a unique feature for type II galaxies but can be observed in type I as well. These findings suggest that the mechanisms shaping the surface brightness and stellar population distributions are not directly coupled. This upturn in age is only observable in the light-weighted profiles while it flattens out in the mass-weighted profiles. Given recent results on the outer parts of nearby systems and the results presented in this Letter, one of the most plausible explanations for the age upturn is an early formation of the entire disc (~10 Gyr ago) followed by an inside-out quenching of the star formation.
AB - We study the stellar properties of 44 face-on spiral galaxies from the Calar Alto Legacy Integral Field Area survey via full spectrum fitting techniques. We compare the age profiles with the surface brightness distribution in order to highlight differences between profile types (type I, exponential profile; and II, down-bending profile). We observe an upturn ('U-shape') in the age profiles for 17 out of these 44 galaxies with reliable stellar information up to their outer parts. This 'U-shape' is not a unique feature for type II galaxies but can be observed in type I as well. These findings suggest that the mechanisms shaping the surface brightness and stellar population distributions are not directly coupled. This upturn in age is only observable in the light-weighted profiles while it flattens out in the mass-weighted profiles. Given recent results on the outer parts of nearby systems and the results presented in this Letter, one of the most plausible explanations for the age upturn is an early formation of the entire disc (~10 Gyr ago) followed by an inside-out quenching of the star formation.
KW - techniques: spectroscopic
KW - galaxies: evolution
KW - galaxies: formation
KW - galaxies: spiral
KW - galaxies: stellar content
KW - galaxies: structure
UR - http://www.scopus.com/inward/record.url?scp=84957593670&partnerID=8YFLogxK
U2 - 10.1093/mnrasl/slv174
DO - 10.1093/mnrasl/slv174
M3 - Article
SN - 1745-3933
VL - 456
SP - L35-L39
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
ER -