NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T01:37:40 PDT
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For refcode 2013ApJ...765..105M:
Retrieve 19 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...765..105M Signatures of Long-lived Spiral Patterns Martinez-Garcia, Eric E.; Gonzalez-Lopezlira, Rosa A. Abstract. 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. Key words: galaxies: kinematics and dynamics, galaxies: photometry, galaxies: spiral, galaxies: stellar content, galaxies: structure
Retrieve 19 NED objects in this reference.
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