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Sol Alonso, M.; Lambas, D.G.; Tissera, P.; Coldwell, G. "Effects of galaxy interactions in different environments" (2006) Monthly Notices of the Royal Astronomical Society. 367(3):1029-1038
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Abstract:

We analyse star formation rates (SFRs) derived from photometric and spectroscopic data of galaxies in pairs in different environments using the 2-degree field galaxy redshift survey (ZdFGRS) and the Sloan digital sky survey (SDSS). The two samples comprise several thousand pairs, suitable to explore into detail the dependence of star formation activity in pairs on orbital parameters and global environment. We use the projected galaxy density derived from the fifth brightest neighbour of each galaxy, with a convenient luminosity threshold to characterize environment in both surveys in a consistent way. Star formation activity is derived through the η parameter in 2dFGRS and through the SFR normalized to the total mass in stars, SFR/M*, given by Brinchmann et al. in the SDSS-second data release (SDSS-DR2). For both galaxy pair catalogs, the star formation birth rate parameter is a strong function of the global environment and orbital parameters. Our analysis on SDSS pairs confirms previous results found with the 2dFGRS where suitable thresholds for the star formation activity induced by interactions are estimated at a projected distance rp = 100 h-1 kpc and a relative velocity ΔV = 350 km s-1. We observe that galaxy interactions are more effective at triggering important star formation activity in low- and moderate-density environments with respect to the control sample of galaxies without a close companion. Although close pairs have a larger fraction of actively star-forming galaxies, they also exhibit a greater fraction of red galaxies with respect to those systems without a close companion, an effect that may indicate that dust stirred up during encounters could affect colours and, partially, obscure tidally induced star formation. © 2006 RAS.

Registro:

Documento: Artículo
Título:Effects of galaxy interactions in different environments
Autor:Sol Alonso, M.; Lambas, D.G.; Tissera, P.; Coldwell, G.
Filiación:Consejo National de Investigaciones Científicas y Técnicas, Rivadavia 1917, Buenos Aires, Argentina
Complejo Astronómico El Leoncito, C.Correo 467, Av. Espana 512 Sur, San Juan, CP J5402DSP, Argentina
Instituto de Astronomía y Física del Espacio, Casilla de Correos 67, Sucursal 29, Buenos Aires 1428, Argentina
Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 925, Cordoba 5000, Argentina
Palabras clave:Cosmology: theory; Galaxies: abundances; Galaxies: evolution; Galaxies: formation
Año:2006
Volumen:367
Número:3
Página de inicio:1029
Página de fin:1038
DOI: http://dx.doi.org/10.1111/j.1365-2966.2006.10020.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_v367_n3_p1029_SolAlonso

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Citas:

---------- APA ----------
Sol Alonso, M., Lambas, D.G., Tissera, P. & Coldwell, G. (2006) . Effects of galaxy interactions in different environments. Monthly Notices of the Royal Astronomical Society, 367(3), 1029-1038.
http://dx.doi.org/10.1111/j.1365-2966.2006.10020.x
---------- CHICAGO ----------
Sol Alonso, M., Lambas, D.G., Tissera, P., Coldwell, G. "Effects of galaxy interactions in different environments" . Monthly Notices of the Royal Astronomical Society 367, no. 3 (2006) : 1029-1038.
http://dx.doi.org/10.1111/j.1365-2966.2006.10020.x
---------- MLA ----------
Sol Alonso, M., Lambas, D.G., Tissera, P., Coldwell, G. "Effects of galaxy interactions in different environments" . Monthly Notices of the Royal Astronomical Society, vol. 367, no. 3, 2006, pp. 1029-1038.
http://dx.doi.org/10.1111/j.1365-2966.2006.10020.x
---------- VANCOUVER ----------
Sol Alonso, M., Lambas, D.G., Tissera, P., Coldwell, G. Effects of galaxy interactions in different environments. Mon. Not. R. Astron. Soc. 2006;367(3):1029-1038.
http://dx.doi.org/10.1111/j.1365-2966.2006.10020.x