Physics – Optics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823802r&link_type=abstract
American Astronomical Society, AAS Meeting #218, #238.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Optics
Scientific paper
We present and discuss the complete source catalog for SWAN, the Survey of a Wide Area with NACO, through which we have obtained near-IR imaging of 24 square arcminutes near the diffraction limit of the ESO Very Large Telescope. SWAN covers 34 fields centered on bright stars at high Galactic latitudes, which allow the use of adaptive optics corrections for improved resolution of faint sources. High-resolution images allow better separation of galactic from stellar sources and morphological classification (based on Sersic index) down to magnitudes of Ks 23. Building on the work of Cresci et al. (2005), we carefully treat the anisoplanatic point spread function across each field, which requires identifying stars and fitting the point spread/radial distance relation with a Strehl ratio. We compare the total observed counts to predictions of a pure luminosity evolution (PLE) model and a numerical hierarchical structure formation model. Division of the total observed counts into late-type and early-type subsamples yields a better match for the PLE model's predictions at fainter magnitudes, consistent with an earlier analysis of a preliminary dataset (Cresci et al. 2006). We also examine close pair statistics at a higher resolution than has been possible with previous near-IR surveys and place constraints on the merger fraction down to Ks 24.
Baker Andrew Jordan
Cresci Giovanni
Davies Richard I.
Ruisard Kiersten
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