Spiral-like star-forming patterns in CALIFA early-type galaxies

DOI: 
10.1051/0004-6361/201525974
Publication date: 
01/01/2016
Main author: 
Gomes J.M.
IAA authors: 
Vílchez;Kehrig;Iglesias-Páramo;García-Benito;Márquez;Del Olmo;González Delgado
Authors: 
Gomes J.M., Papaderos P., Vílchez J.M., Kehrig C., Iglesias-Páramo J., Breda I., Lehnert M.D., Sánchez S.F., Ziegler B., Dos Reis S.N., Bland-Hawthorn J., Galbany L., Bomans D.J., Rosales-Ortega F.F., Walcher C.J., García-Benito R., Márquez I., Del Olmo A., Mollá M., Marino R.A., Catalán-Torrecilla C., González Delgado R.M., López-Sánchez A.R.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
585
Pages: 
Number: 
A92
Abstract: 
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. © ESO, 2015.
Database: 
SCOPUS
WOK
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2016A&A...585A..92G/abstract
ADS Bibcode: 
2016A&A...585A..92G
Keywords: 
Galaxies: elliptical and lenticular, cD; Galaxies: ISM; Galaxies: kinematics and dynamics; Galaxies: nuclei; Galaxies: star formation