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

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 A) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3 A

Keywords:

• Astrophysics
• Astronomy
• Disc
• Spectroscopy
• Physics
• Galaxy
• Spiral
• Elliptical galaxy
• Aperture
• Disc galaxy
• early type
• spatial segregation
• field spectroscopy

• Correction
• Source
• Cite
• Save
• Machine Reading By IdeaReader