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We present a new catalog of high-redshift candidate \textit{Herschel}sources. Our sample is obtained after applying a multifrequency filteringmethod ("matched multifilter"), which is designed to improve thesignal-to-noise ratio (S/N) of faint extragalactic point sources. The method istested against already-detected sources from the \textit{Herschel}Astrophysical Terahertz Large Area Survey (H-ATLAS) and used to search for newhigh-redshift candidates. The multifilter technique also produces an estimationof the photometric redshift of the sources. When compared with a sample ofsources with known spectroscopic redshift, the photometric redshift returnedfrom the multifilter is unbiased in the redshift range 0.8 < z < 4.3. Usingsimulated data we reproduced the same unbiased result in roughly the sameredshift range and determined the error (and bias above $z\approx4$) in thephotometric redshifts. Based on the multifilter technique, and a selectionbased on color, flux, and agreement of fit between the observed photometry andassumed SED, we find 370 robust candidates to be relatively brighthigh-redshift sources. A second sample with 237 objects focuses on the faintend at high-redshift. These 237 sources were previously near the H-ATLASdetection limit but are now confirmed with our technique as high significancedetections. Finally, we look for possible lensed Herschel sources bycross-correlating the first sample of 370 objects with two different catalogsof known low-redshift objects, the redMaPPer Galaxy Cluster Catalog and acatalog of galaxies with spectroscopic redshift from the Sloan Digital SkySurvey Data Release 14. Our search renders a number of candidates to be lensedsystems from the SDSS cross-correlation but none from the redMaPPeR confirmingthe more likely galactic nature of the lenses.

Multifrequency filter search for high redshift sources and lensing systems in Herschel-ATLAS