Spiral-like star-forming patterns in CALIFA early-type galaxies
Abstract
Based on a combined analysis of SDSS imaging and CALIFA integral field spectroscopy data, we report on the detection of faint (24 < {\mu} mag/arcsec < 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(H\alpha)1{\AA}) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3{\AA}<EW(H\alpha)<~20{\AA}) 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.
Cite
@article{arxiv.1511.00744,
title = {Spiral-like star-forming patterns in CALIFA early-type galaxies},
author = {J. M. Gomes and P. Papaderos and J. M. Vílchez and C. Kehrig and J. Iglesias-Páramo and I. Breda and M. D. Lehnert and S. F. Sánchez and B. Ziegler and S. N. dos Reis and J. Bland-Hawthorn and L. Galbany and D. J. Bomans and F. F. Rosales-Ortega and C. J. Walcher and R. García-Benito and I. Márquez and A. del Olmo and M. Mollá and R. A. Marino and C. Catalán-Torrecilla and R. M. González Delgado and Á. R. López-Sánchez and the CALIFA collaboration},
journal= {arXiv preprint arXiv:1511.00744},
year = {2015}
}
Comments
Accepted to A&A, 5 pages, 1 figure