SIMBAD references

2013ApJ...765..105M - Astrophys. J., 765, 105 (2013/March-2)

Signatures of long-lived spiral patterns.

MARTINEZ-GARCIA E.E. and GONZALEZ-LOPEZLIRA R.A.

Abstract (from CDS):

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 comparison 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 of 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.

Abstract Copyright:

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: photometry - galaxies: spiral - galaxies: stellar content - galaxies: structure

Simbad objects: 29

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2019.10.17-21:24:29

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