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- W3100305528 abstract "We measure the mass growth rate by merging for a wide range of galaxy types. We present the small-scale (0.014 < r < 11 h70^{-1} Mpc) projected cross-correlation functions w(rp) of galaxy subsamples from the spectroscopic sample of the NYU VAGC (5 times 10^5 galaxies of redshifts 0.03 < z < 0.15) with galaxy subsamples from the SDSS imaging (4 times 10^7 galaxies). We use smooth fits to de-project the two-dimensional functions w(rp) to obtain smooth three-dimensional real-space cross-correlation functions xi(r) for each of several spectroscopic subsamples with each of several imaging subsamples. Because close pairs are expected to merge, the three-space functions and dynamical evolution time estimates provide galaxy accretion rates. We find that the accretion onto massive blue galaxies and onto red galaxies is dominated by red companions, and that onto small-mass blue galaxies, red and blue galaxies make comparable contributions. We integrate over all types of companions and find that at fixed stellar mass, the total fractional accretion rates onto red galaxies (sim 1.5 h70 percent per Gyr) is greater than that onto blue galaxies (sim 0.5 h70 percent per Gyr). Although these rates are very low, they are almost certainly over-estimates because we have assumed that all close pairs merge as quickly as dynamical friction permits." @default.
- W3100305528 created "2020-11-23" @default.
- W3100305528 creator A5025226631 @default.
- W3100305528 creator A5069645639 @default.
- W3100305528 creator A5071423709 @default.
- W3100305528 date "2012-10-29" @default.
- W3100305528 modified "2023-10-05" @default.
- W3100305528 title "GALAXY GROWTH BY MERGING IN THE NEARBY UNIVERSE" @default.
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- W3100305528 doi "https://doi.org/10.1088/0004-637x/759/2/140" @default.
- W3100305528 hasPublicationYear "2012" @default.
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