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Perez, J.; Michel-Dansac, L.; Tissera, P.B. "Chemical evolution during gas-rich galaxy interactions" (2011) Monthly Notices of the Royal Astronomical Society. 417(1):580-590
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Abstract:

We perform and analyse a set of galaxy interactions performed by using a self-consistent chemo-hydrodynamical model which includes star formation, supernova (SN) feedback and chemical evolution. In agreement with previous works, we find that tidally induced low-metallicity gas inflows dilute the central oxygen abundance and contribute to the flattening of the metallicity gradients. The tidally induced inflows trigger starbursts which increase the impact of Type II supernova (SN II) feedback injecting new chemical elements and driving galactic winds which modulate the metallicity distribution. Although α-enhancement in the central regions is detected as a result of the induced starbursts in agreement with previous works, our simulations suggest that this parameter can only provide a timing of the first pericentre mainly for non-retrograde encounters. In order to reproduce wet major mergers at low and high redshifts, we have run simulations with respectively 20 and 50 per cent of the disc in the form of gas. We find that the more gas-rich encounters behave similarly to the less rich ones, between the first and second pericentre, where low-metallicity gas inflows are triggered. However, the higher strength of the inflows triggered in the more gas-rich interactions produces larger metal dilution factors, which are modulated afterwards by the new chemical production by SN. We find that the more gas-rich interaction develops violent and clumpy star formation triggered by local instabilities all over the disc before the first pericentre, so that if these galaxies were observed at these early stages where no important tidally induced inflows have been able to be developed yet, they would tend to show an excess of oxygen. We find a global mean correlation of both the central abundances and the gradients with the strength of the star formation activity. However, the correlations are affected by orbital parameters, gas inflows and outflows, suggesting that it might be difficult to determine it from observations. Overall, our findings show that a consistent description of the gas dynamics and stellar evolution along the interactions is necessary to assess their effects on the chemical properties of the interstellar medium. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.

Registro:

Documento: Artículo
Título:Chemical evolution during gas-rich galaxy interactions
Autor:Perez, J.; Michel-Dansac, L.; Tissera, P.B.
Filiación:Instituto de Astronomía y Física del Espacio, Conicet-UBA, CC67, Suc.28, Ciudad de Buenos Aires, Argentina
Cátedra de Astronomía General, Facultad de Ciencias Astronomía y Geofísica, Universidad Nacional de La Plata, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Argentina
Centre de Recherche Astrophysique de Lyon, Université de Lyon, Université Lyon 1, Observatoire de Lyon, Ecole Normale Supérieure de Lyon, CNRS, UMR 5574, 9 avenue Charles André, Saint-Genis Laval, 69230, France
Palabras clave:Galaxies: abundances; Galaxies: evolution; Galaxies: formation; Galaxies: interactions
Año:2011
Volumen:417
Número:1
Página de inicio:580
Página de fin:590
DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19300.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_v417_n1_p580_Perez

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Citas:

---------- APA ----------
Perez, J., Michel-Dansac, L. & Tissera, P.B. (2011) . Chemical evolution during gas-rich galaxy interactions. Monthly Notices of the Royal Astronomical Society, 417(1), 580-590.
http://dx.doi.org/10.1111/j.1365-2966.2011.19300.x
---------- CHICAGO ----------
Perez, J., Michel-Dansac, L., Tissera, P.B. "Chemical evolution during gas-rich galaxy interactions" . Monthly Notices of the Royal Astronomical Society 417, no. 1 (2011) : 580-590.
http://dx.doi.org/10.1111/j.1365-2966.2011.19300.x
---------- MLA ----------
Perez, J., Michel-Dansac, L., Tissera, P.B. "Chemical evolution during gas-rich galaxy interactions" . Monthly Notices of the Royal Astronomical Society, vol. 417, no. 1, 2011, pp. 580-590.
http://dx.doi.org/10.1111/j.1365-2966.2011.19300.x
---------- VANCOUVER ----------
Perez, J., Michel-Dansac, L., Tissera, P.B. Chemical evolution during gas-rich galaxy interactions. Mon. Not. R. Astron. Soc. 2011;417(1):580-590.
http://dx.doi.org/10.1111/j.1365-2966.2011.19300.x