Título
Signatures of long-lived spiral patterns.
Autor
ERIC EMMANUEL MARTINEZ GARCIA
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
Azimuthal age/color gradients across spiral arms are a signature of long-lived spirals. From a sample of 19 normal (or weakly barred) spirals where we have previously found azimuthal age/color gradient candidates, 13 objects were further selected if a two-armed grand-design pattern survived in a surface density stellar mass map. Mass maps were obtained from optical and near-infrared imaging, by comparing with a Monte Carlo library of stellar population synthesis models that allowed us to obtain the mass-to-light ratio in the J-band, (M=L)J , as a function of (g - i) versus (i - J) color. The selected spirals were analyzed with Fourier methods in search for other signatures of long-lived modes related to the gradients, such as the gradient divergence toward corotation, and the behavior of the phase angle of the two-armed spiral in different wavebands, as expected from theory. The results show additional signatures of long-lived spirals in at least 50% of the objects.
Editor
The Astrophysical Journal
Fecha de publicación
21 de febrero de 2013
Tipo de publicación
Artículo
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Audiencia
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Público en general
Sugerencia de citación
Martínez-García, Eric E. and González-Lópezlira, Rosa A., (2013), Signatures of long-lived spiral patterns, The Astrophysical Journal, Vol. 765(2):1-29
Repositorio Orígen
Repositorio Institucional del INAOE
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