Spiral-like star-forming patterns in CALIFA early-type galaxies
- Autor(en)
- J. M. Gomes, P. Papaderos, J. M. Vílchez, C. Kehrig, J. Iglesias-Páramo, I. Breda, M. D. Lehnert, S. F. Sánchez, B. Ziegler, S. N. Dos Reis, J. Bland-Hawthorn, L. Galbany, D. J. Bomans, F. F. Rosales-Ortega, C. J. Walcher, R. García-Benito, I. Márquez, A. Del Olmo, M. Mollá, R. A. Marino, C. Catalán-Torrecilla, R. M. González Delgado, A. R. López-Sánchez
- Abstrakt
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.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Universidade do Porto, Instituto de Astrofísica de Andalucía, Estación Experimental de Zonas Áridas, Université Paris VI - Pierre-et-Marie-Curie, Universidad Nacional Autonoma de Mexico, The University of Sydney, Instituto Milenio de Astrofisica, Universidad de Chile, Ruhr-Universität Bochum (RUB), National Institute of Astrophysics, Optics and Electronics (INAOE), Leibniz-Institut für Astrophysik Potsdam, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Universidad Complutense De Madrid, Eidgenössische Technische Hochschule Zürich, Australian Astronomical Observatory, Macquarie University
- Journal
- Astronomy and Astrophysics
- Band
- 585
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201525974
- Publikationsdatum
- 01-2016
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/d32ce075-8d1d-4485-826f-cbfa6080f40c