2006/02/18 by Ricardo L. C. Ogando, R. L. C. Ogando, M. A. G. Maia +14 · 1 citation
Arts and Humanities · Physics and Astronomy · Social Sciences · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #FOS: Physical sciences #Geography and Environmental Studies in Latin America #Historical Studies on Spain #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0602416
2 pages, 2 figures, contributed talk to the 11th Latin American Regional IAU meeting, Pucon, Chile 2005. To be published by Revista Mexicana de Astronomia y Astrofisica, Conference Series (rmaa.cls)
arxiv created 2006/02/18 · openalex publication_date 2006/02/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present radial gradients of the Lick index Mg2 for 40 early-type galaxies. In plots of Grad(Mg2) versus mass indicators, such as log(sigma), the lower boundary of the points distribution may be populated by galaxies which predominantly formed by monolithic collapse. Galaxies showing flatter gradients at higher masses could represent objects which suffered important merging episodes. Thus, our results support a hybrid formation scenario. To remove possible age effects, we computed metallicity gradients (Grad[Z/H]) using Mg2 and Hbeta indices for an [alpha/Fe]=0.3 single stellar population model. The conclusions remain the same.