Effects of galaxy interactions in different environments
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...
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todo:paper_00358711_v367_n3_p1029_SolAlonso2023-10-03T14:46:46Z Effects of galaxy interactions in different environments Sol Alonso, M. Lambas, D.G. Tissera, P. Coldwell, G. Cosmology: theory Galaxies: abundances Galaxies: evolution Galaxies: formation 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00358711_v367_n3_p1029_SolAlonso |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cosmology: theory Galaxies: abundances Galaxies: evolution Galaxies: formation |
| spellingShingle |
Cosmology: theory Galaxies: abundances Galaxies: evolution Galaxies: formation Sol Alonso, M. Lambas, D.G. Tissera, P. Coldwell, G. Effects of galaxy interactions in different environments |
| topic_facet |
Cosmology: theory Galaxies: abundances Galaxies: evolution Galaxies: formation |
| description |
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. |
| format |
JOUR |
| author |
Sol Alonso, M. Lambas, D.G. Tissera, P. Coldwell, G. |
| author_facet |
Sol Alonso, M. Lambas, D.G. Tissera, P. Coldwell, G. |
| author_sort |
Sol Alonso, M. |
| title |
Effects of galaxy interactions in different environments |
| title_short |
Effects of galaxy interactions in different environments |
| title_full |
Effects of galaxy interactions in different environments |
| title_fullStr |
Effects of galaxy interactions in different environments |
| title_full_unstemmed |
Effects of galaxy interactions in different environments |
| title_sort |
effects of galaxy interactions in different environments |
| url |
http://hdl.handle.net/20.500.12110/paper_00358711_v367_n3_p1029_SolAlonso |
| work_keys_str_mv |
AT solalonsom effectsofgalaxyinteractionsindifferentenvironments AT lambasdg effectsofgalaxyinteractionsindifferentenvironments AT tisserap effectsofgalaxyinteractionsindifferentenvironments AT coldwellg effectsofgalaxyinteractionsindifferentenvironments |
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1782024207372124160 |