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Título:
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Star formation in the extended gaseous disk of the isolated galaxy CIG 96
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Autores:
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Espada, D. ;
Muñoz Mateos, J. C. ;
Gil de Paz, Armando ;
Sabater, J. ;
Boissier, S. ;
Verley, S. ;
Athanassoula, E. ;
Bosma, A. ;
León, S. ;
Verdes Montenegro, L. ;
Yun, M. ;
Sulentic, J.
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Tipo de documento:
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texto impreso
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Editorial:
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American Astronomical Society, 2011-07-20
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Materia = Ciencias: Física: Astronomía
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Tipo = Artículo
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Resumen:
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We study the Kennicutt-Schmidt star formation law and efficiency in the gaseous disk of the isolated galaxy CIG 96 (NGC 864), with special emphasis on its unusually large atomic gas (H I) disk (r_ H mathsci/r_ 25 = 3.5, r_ 25 = 1 85). We present deep Galaxy Evolution Explorer near- and far-UV observations, used as a recent star formation tracer, and we compare them with new, high-resolution (16''or 1.6 kpc) Very Large Array H I observations. The UV and H I maps show good spatial correlation outside the inner 1', where the H I phase dominates over H_2. Star-forming regions in the extended gaseous disk are mainly located along the enhanced H I emission within two (relatively) symmetric, giant gaseous spiral arm-like features, which emulate an H I pseudo-ring at r?3'. Inside this structure, two smaller gaseous spiral arms extend from the northeast and southwest of the optical disk and connect to the previously mentioned H I pseudo-ring. Interestingly, we find that the (atomic) Kennicutt-Schmidt power-law index systematically decreases with radius, from N ?3.0 ± 0.3 in the inner disk (0 8-1 7) to N = 1.6 ± 0.5 in the outskirts of the gaseous disk (3 3-4 2). Although the star formation efficiency (SFE), the star formation rate per unit of gas, decreases with radius where the H I component dominates as is common in galaxies, we find that there is a break of the correlation at r = 1.5r_25. At radii 1.5r_ 25 2r_25) and at such low surface densities might be a common characteristic in extended UV disk galaxies.
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En línea:
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https://eprints.ucm.es/35449/1/gildepaz52libre.pdf
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