TY - JOUR
T1 - Spiral-like star-forming patterns in CALIFA early-type galaxies
AU - Gomes, J. M.
AU - Papaderos, P.
AU - Vílchez, J. M.
AU - Kehrig, C.
AU - Iglesias-Páramo, J.
AU - Breda, I.
AU - Lehnert, M. D.
AU - Sánchez, S. F.
AU - Ziegler, B.
AU - Dos Reis, S. N.
AU - Bland-Hawthorn, J.
AU - Galbany, L.
AU - Bomans, D. J.
AU - Rosales-Ortega, F. F.
AU - Walcher, C. J.
AU - García-Benito, R.
AU - Márquez, I.
AU - Del Olmo, A.
AU - Mollá, M.
AU - Marino, R. A.
AU - Catalán-Torrecilla, C.
AU - González Delgado, R. M.
AU - López-Sánchez, A. R.
AU - Collaboration, Califa
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Based on a combined analysis of SDSS imaging and CALIFA integral field spectroscopy data, we report on the detection of faint (24 <μr mag/□″< 26) star-forming spiral-arm-like features in the periphery of three nearby early-type galaxies (ETGs). These features are of considerable interest because they document the still ongoing inside-out growth of some local ETGs and may add valuable observational insight into the origin and evolution of spiral structure in triaxial stellar systems. A characteristic property of the nebular component in the studied ETGs, classified i+, is a two-radial-zone structure, with the inner zone that displays faint (EW(Hα) ≃ 1 Å) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3 Å <EW(Hα)≲ 20 Å) Hii-region characteristics. This spatial segregation of nebular emission in two physically distinct concentric zones calls for an examination of aperture effects in studies of type i+ ETGs with single-fiber spectroscopic data.
AB - Based on a combined analysis of SDSS imaging and CALIFA integral field spectroscopy data, we report on the detection of faint (24 <μr mag/□″< 26) star-forming spiral-arm-like features in the periphery of three nearby early-type galaxies (ETGs). These features are of considerable interest because they document the still ongoing inside-out growth of some local ETGs and may add valuable observational insight into the origin and evolution of spiral structure in triaxial stellar systems. A characteristic property of the nebular component in the studied ETGs, classified i+, is a two-radial-zone structure, with the inner zone that displays faint (EW(Hα) ≃ 1 Å) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3 Å <EW(Hα)≲ 20 Å) Hii-region characteristics. This spatial segregation of nebular emission in two physically distinct concentric zones calls for an examination of aperture effects in studies of type i+ ETGs with single-fiber spectroscopic data.
KW - Galaxies: elliptical and lenticular, cD
KW - Galaxies: ISM
KW - Galaxies: kinematics and dynamics
KW - Galaxies: nuclei
KW - Galaxies: star formation
UR - http://www.scopus.com/inward/record.url?scp=84953425737&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201525974
DO - 10.1051/0004-6361/201525974
M3 - Article
AN - SCOPUS:84953425737
SN - 0004-6361
VL - 585
SP - 1
EP - 6
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A92
ER -