STELLAR ORBITAL STUDIES IN NORMAL SPIRAL GALAXIES: EFFECT OF SPIRAL ARMS ON DISK DYNAMICS
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2015
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| _version_ | 1876437576565391360 |
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| author | A. Pérez-Villegas |
| author_facet | A. Pérez-Villegas |
| contents | STELLAR ORBITAL STUDIES IN NORMAL SPIRAL GALAXIES: EFFECT OF SPIRAL ARMS ON DISK DYNAMICS A. Pérez-Villegas B. Pichardo E. Moreno Física, Astronomía y Matemáticas Chaos spirals evolution structure kinematics and dynamics We have built a family of non-axisymmetric potential models for normal non-ba rred spiral galaxies. For this purpose, a three-dimensional self-gravitating model of spiral arms (PERLAS) is used. We analyze the stellar dynamics on the disk plane, varying structural and dynamical parameters such as pitc h angle, strength of spiral arms and angular speed. For the pitch angle, we found two limits. The firs t limit, based on ordered behavior, periodic orbit studies show that for pitch angles up to approximately 15 ◦ , 18 ◦ , and 20 ◦ for Sa, Sb and Sc galaxies, respectively, the spiral arms could be long-lasting structures . Beyond those limits, spiral arms may be explained as transient features rather than long-lasting large-scale str uctures. In a second limit, from a phase space orbital study based on chaotic behavior, we found that for pitch ang les larger than ∼ 30 ◦ , ∼ 40 ◦ and ∼ 50 ◦ for Sa, Sb, and Sc galaxies, respectively, chaotic orbits dominate all the prog rade phase space region that surrounds the periodic orbits sculpting the spiral arms, and can even destroy them . Finally, we studied orbital dynamics varying other parameters such as the pattern speed and the spiral arm mass; also we looked for restrictions for these parameters in different morphological types. In thes e studies we noticed that the effect of spiral arms on the disk dynamics, when we vary the pattern speed and mass, is strongly linked to the pitch angle. 2015 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57150514016 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.46 |
| format | Artículo científico |
| id | redalyc_57150514016 |
| institution | Redalyc |
| language | en |
| publishDate | 2015 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | STELLAR ORBITAL STUDIES IN NORMAL SPIRAL GALAXIES: EFFECT OF SPIRAL ARMS ON DISK DYNAMICS A. Pérez-Villegas Física, Astronomía y Matemáticas Chaos spirals evolution structure kinematics and dynamics STELLAR ORBITAL STUDIES IN NORMAL SPIRAL GALAXIES: EFFECT OF SPIRAL ARMS ON DISK DYNAMICS A. Pérez-Villegas B. Pichardo E. Moreno Física, Astronomía y Matemáticas Chaos spirals evolution structure kinematics and dynamics We have built a family of non-axisymmetric potential models for normal non-ba rred spiral galaxies. For this purpose, a three-dimensional self-gravitating model of spiral arms (PERLAS) is used. We analyze the stellar dynamics on the disk plane, varying structural and dynamical parameters such as pitc h angle, strength of spiral arms and angular speed. For the pitch angle, we found two limits. The firs t limit, based on ordered behavior, periodic orbit studies show that for pitch angles up to approximately 15 ◦ , 18 ◦ , and 20 ◦ for Sa, Sb and Sc galaxies, respectively, the spiral arms could be long-lasting structures . Beyond those limits, spiral arms may be explained as transient features rather than long-lasting large-scale str uctures. In a second limit, from a phase space orbital study based on chaotic behavior, we found that for pitch ang les larger than ∼ 30 ◦ , ∼ 40 ◦ and ∼ 50 ◦ for Sa, Sb, and Sc galaxies, respectively, chaotic orbits dominate all the prog rade phase space region that surrounds the periodic orbits sculpting the spiral arms, and can even destroy them . Finally, we studied orbital dynamics varying other parameters such as the pattern speed and the spiral arm mass; also we looked for restrictions for these parameters in different morphological types. In thes e studies we noticed that the effect of spiral arms on the disk dynamics, when we vary the pattern speed and mass, is strongly linked to the pitch angle. 2015 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57150514016 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.46 |
| title | STELLAR ORBITAL STUDIES IN NORMAL SPIRAL GALAXIES: EFFECT OF SPIRAL ARMS ON DISK DYNAMICS |
| topic | Física, Astronomía y Matemáticas Chaos spirals evolution structure kinematics and dynamics |
| url | https://www.redalyc.org/articulo.oa?id=57150514016 |