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Interaction effects on galaxy pairs with Gemini/GMOS- I : electron density

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Interaction effects on galaxy pairs with Gemini/GMOS- I : electron density

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Título Interaction effects on galaxy pairs with Gemini/GMOS- I : electron density
Autor Krabbe, Angela Cristina
Rosa, Deise Aparecida
Dors Júnior, Oli Luiz
Pastoriza, Miriani Griselda
Winge, Claudia
Hägelle, Guillermo Federico
Cardaci, Mónica V.
Rodrigues, Irapuan
Abstract We present an observational study about the impacts of the interactions on the electron density of HII regions located in seven systems of interacting galaxies. The data consist of long-slit spectra in the range 4400–7300 Å, obtained with the Gemini Multi-Object Spectrograph at Gemini South (GMOS-S). The electron density was determined using the ratio of emission lines [S II] λ6716/λ6731. Our results indicate that the electron density estimates obtained of HII regions from our sample of interacting galaxies are systematically higher than those derived for isolated galaxies. The mean electron density values of interacting galaxies are in the range of Ne = 24–532 cm-³, while those obtained for isolated galaxies are in the range of Ne =40–137 cm-³. Comparing the observed emission lines with predictions of photoionization models, we verified that almost all the HII regions of the galaxies AM 1054A, AM 2058B and AM 2306B have emission lines excited by shock gas. For the remaining galaxies, only few HII regions have emission lines excited by shocks, such as in AM 2322B (one point) and AM 2322A (four points). No correlation is obtained between the presence of shocks and electron densities. Indeed, the highest electron density values found in our sample do not belong to the objects with gas shock excitation. We emphasize the importance of considering these quantities especially when the metallicity is derived for these types of systems.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 437, no. 2 (Jan. 2014), p. 1155-1170
Assunto Espectros astronômicos
Fotoionizacao
Galáxias ativas
[en] Galaxies: general
[en] Galaxies: interactions
[en] Galaxies: ISM
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/103444
Arquivos Descrição Formato
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