Large Galaxies: Why Are Large Galaxies Special Objects in the XSC?
The XSC is complete for all galaxies larger than ~10-15″ in diameter, including the largest galaxies in the sky. However, due to their proximity to a survey “scan” edge, galaxies larger than ~1′ or 2′ will have photometry that is systematically incomplete. We have rectified this situation. The 2MASS survey acquired images of the sky using relatively small arrays. A “tile” or scan is 8.5′ in angular width, and the typical overlap between scans is 50″. Galaxies that are smaller than this overlap are guaranteed to be fully sampled in at least one survey scan. Larger galaxies may be truncated based on their proximity to a scan edge. Therefore it was necessary to construct an atlas of large objects made from “pieces” of adjoining scans. The net outcome is that we will fully recover galaxies that are currently “lost” or misrepresented in the 2MASS extended source pipeline. The resultant set of mosaics and corresponding source characterizations are collectively called the 2MASS Large Galaxy A
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