Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921109a&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #211.09; Bulletin of the American Astronomical Society,
Other
Scientific paper
We analyze the effects of galaxy interactions on star formation for close galaxy pairs derived from the Two Degree Field Galaxy Redshift Survey (2dFGRS). A volume-limited sample containing galaxies with MbJ ≤ -19 provides a uniform data set consisting of 41,239 galaxies. Using a line-of-sight velocity difference (ΔV) of 1000 km/s and a projected separation (Dp) of 50 kpc/h, we obtain a sample of 1,344 galaxies in close pairs. Analysis of this sample reproduces previously shown linear correlations between EW(Ha) and ΔV and EW(Ha) and Dp for galaxy pairs. Using the number of companions within 1 Mpc/h on the sky and 1000 km/s in redshift as an environment statistic, we explore the dependence of star formation on both the pair orbit parameters and the local environment. Results indicate that it is primarily the pairs in extremely low-density environments that have statistically elevated amounts of star formation when compared to other galaxies within the same environment.
Arnold Jacob
Barton Elizabeth J.
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