Artículo
Abstract:
We study the mass-metallicity relation of galaxies in pairs and in isolation taken from the Sloan Digital Sky Survey-Data Release 4 (SDSS-DR4) using the stellar masses and oxygen abundances derived by Tremonti et al. Close galaxy pairs, defined by projected separation rp < 25 kpc h-1 and radial velocity ΔV < 350 km s-1, are morphologically classified according to the strength of the interaction signs. We find that only for pairs showing signs of strong interactions, the mass-metallicity relation differs significantly from that of galaxies in isolation. In such pairs, the mean gas-phase oxygen abundances of galaxies with low stellar masses (M* ≲ 109 M⊙ h-1) exhibit an excess of 0.2 dex. Conversely, at larger masses (M* ≳ 1010 M⊙ h-1) galaxies have a systematically lower metallicity, although with a smaller difference (-0.05 dex). Similar trends are obtained if g-band magnitudes are used instead of stellar masses. In minor interactions, we find that the less massive member is systematically enriched, while a galaxy in interaction with a comparable stellar mass companion shows a metallicity decrement with respect to galaxies in isolation. We argue that metal-rich starbursts triggered by a more massive component, and inflows of low-metallicity gas induced by comparable or less massive companion galaxies, provide a natural scenario to explain our findings. © 2008 The Authors. Journal compilation © 2008 RAS.
Registro:
| Documento: | Artículo |
| Título: | The mass-metallicity relation of interacting galaxies |
| Autor: | Michel-Dansac, L.; Lambas, D.G.; Alonso, M.S.; Tissera, P. |
| Filiación: | Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina IATE, CONICET, OAC, Universidad Nacional de Córdoba, Laprida 854, X5000 BGR, Còrdoba, Argentina Complejo Astronómico El Leoncito, CP J5402DSP San Juan, Argentina Instituto de Astronomía y Física del Espacio, C1428ZAA Ciudad Autònoma de Buenos Aires, Argentina |
| Palabras clave: | Galaxies: abundances; Galaxies: evolution; Galaxies: formation; Galaxies: interactions |
| Año: | 2008 |
| Volumen: | 386 |
| Número: | 1 |
| Página de inicio: | L82 |
| Página de fin: | L86 |
| DOI: | http://dx.doi.org/10.1111/j.1745-3933.2008.00466.x |
| Título revista: | Monthly Notices of the Royal Astronomical Society: Letters |
| Título revista abreviado: | Mon. Not. R. Astron. Soc. Lett |
| ISSN: | 17453933 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v386_n1_pL82_MichelDansac |
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Citas:
---------- APA ----------
Michel-Dansac, L., Lambas, D.G., Alonso, M.S. & Tissera, P. (2008) . The mass-metallicity relation of interacting galaxies. Monthly Notices of the Royal Astronomical Society: Letters, 386(1), L82-L86.http://dx.doi.org/10.1111/j.1745-3933.2008.00466.x
---------- CHICAGO ----------
Michel-Dansac, L., Lambas, D.G., Alonso, M.S., Tissera, P. "The mass-metallicity relation of interacting galaxies" . Monthly Notices of the Royal Astronomical Society: Letters 386, no. 1 (2008) : L82-L86.http://dx.doi.org/10.1111/j.1745-3933.2008.00466.x
---------- MLA ----------
Michel-Dansac, L., Lambas, D.G., Alonso, M.S., Tissera, P. "The mass-metallicity relation of interacting galaxies" . Monthly Notices of the Royal Astronomical Society: Letters, vol. 386, no. 1, 2008, pp. L82-L86.http://dx.doi.org/10.1111/j.1745-3933.2008.00466.x
---------- VANCOUVER ----------
Michel-Dansac, L., Lambas, D.G., Alonso, M.S., Tissera, P. The mass-metallicity relation of interacting galaxies. Mon. Not. R. Astron. Soc. Lett. 2008;386(1):L82-L86.http://dx.doi.org/10.1111/j.1745-3933.2008.00466.x
