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Abstract:

We study the effects of mergers on the structural properties of disc-like systems by using smooth particle hydrodynamical (SPH) numerical simulations in hierarchical clustering scenarios. In order to assess the effects of mergers on the mass distributions we performed a bulge - disc decomposition of the projected surface density of the systems at different stages of the merger process. We assumed an exponential law for the disc component and the Sérsic law for the bulges. We found that simulated objects at z = 0 have bulge profiles with shape parameters n ≈ 1, consistent with observational results of spiral galaxies. The complete sample of simulated objects at z = 0 and z > 0 shows that n takes values in the range n ≈ 0.4-4. We found that secular evolution tends to produce exponential bulge profiles, while the fusion of baryonic cores tends to increase the n value and helps to generate the correlation between B/D and n. We found no dependence on the relative mass of the colliding objects. Our results suggest that mergers, through secular evolution and fusions, could produce the transformation of galactic objects along the Hubble sequence by driving a morphological loop that might also depend on the properties of the central galactic potential wells, which are also affected by mergers.

Registro:

Documento: Artículo
Título:The effects of mergers on the formation of disc-bulge systems in hierarchical clustering scenarios
Autor:Scannapieco, C.; Tissera, P.B.
Filiación:Inst. de Astronomia y Fis. del E., IAFE, Casilla de Correos 67, Suc. 28, Buenos Aires 1428, Argentina
Palabras clave:Galaxies: Evolution; Galaxies: Fundamental parameters; Galaxies: Interactions; Methods: Numerical
Año:2003
Volumen:338
Número:4
Página de inicio:880
Página de fin:890
DOI: http://dx.doi.org/10.1046/j.1365-8711.2003.06133.x
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v338_n4_p880_Scannapieco

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Citas:

---------- APA ----------
Scannapieco, C. & Tissera, P.B. (2003) . The effects of mergers on the formation of disc-bulge systems in hierarchical clustering scenarios. Monthly Notices of the Royal Astronomical Society, 338(4), 880-890.
http://dx.doi.org/10.1046/j.1365-8711.2003.06133.x
---------- CHICAGO ----------
Scannapieco, C., Tissera, P.B. "The effects of mergers on the formation of disc-bulge systems in hierarchical clustering scenarios" . Monthly Notices of the Royal Astronomical Society 338, no. 4 (2003) : 880-890.
http://dx.doi.org/10.1046/j.1365-8711.2003.06133.x
---------- MLA ----------
Scannapieco, C., Tissera, P.B. "The effects of mergers on the formation of disc-bulge systems in hierarchical clustering scenarios" . Monthly Notices of the Royal Astronomical Society, vol. 338, no. 4, 2003, pp. 880-890.
http://dx.doi.org/10.1046/j.1365-8711.2003.06133.x
---------- VANCOUVER ----------
Scannapieco, C., Tissera, P.B. The effects of mergers on the formation of disc-bulge systems in hierarchical clustering scenarios. Mon. Not. R. Astron. Soc. 2003;338(4):880-890.
http://dx.doi.org/10.1046/j.1365-8711.2003.06133.x