Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-10
Mon.Not.Roy.Astron.Soc. 358 (2005) 875-882
Astronomy and Astrophysics
Astrophysics
8 pages, 7 figures, MNRAS in press
Scientific paper
10.1111/j.1365-2966.2005.08790.x
We present evidence for a positive angular correlation between bright submillimetre sources and low-redshift galaxies. The study was conducted using 39 sources selected from 3 contiguous, flux-limited SCUBA surveys, cross-correlated with optical field galaxies with magnitudes R<23 (with a median redshift of z~0.5). We find that the angular distribution of submm sources is skewed towards overdensities in the galaxy population, consistent with 25+-12 per cent being associated with dense, low-redshift structure. The signal appears to be dominated by the brightest sources with a flux density S_850>10mJy. We conduct Monte-Carlo simulations of clustered submm populations, and find that the probability of obtaining these correlations by chance is less than 0.4 per cent. The results may suggest that a larger than expected fraction of submm sources lie at z~0.5. Alternatively, we argue that this signal is most likely caused by gravitational lensing bias, which may be entirely expected given the steep submm source counts. Implications for future submm surveys are discussed.
Alexander Dave M.
Almaini Omar
Bauer Franz Erik
Dunlop James S.
Liu Charles T.
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