Herschel-ATLAS: Planck sources in the Phase 1 fields

TL;DR

This paper cross-correlates Planck and Herschel-ATLAS data in a 134.55 deg2 area, identifying various sources including galaxies, cirrus, and high-redshift objects, highlighting Herschel's role in interpreting Planck sources.

Contribution

It provides the first detailed cross-correlation analysis between Planck ERCSC sources and Herschel-ATLAS detections in the Phase 1 fields.

Findings

Identification of 10 bright, low-z galaxies among Planck sources.

Detection of a high-redshift, lensed Herschel source at z=3.26.

Demonstration of Herschel's higher resolution aiding Planck source interpretation.

Abstract

We present the results of a cross-correlation of the Planck Early Release Compact Source Catalog (ERCSC) with the catalog of Herschel-ATLAS sources detected in the Phase 1 fields, covering 134.55 deg2. There are 28 ERCSC sources detected by Planck at 857 GHz in this area. As many as 16 of them are probably high Galactic latitude cirrus; 10 additional sources can be clearly identified as bright, low-z galaxies; one further source is resolved by Herschel as two relatively bright sources; and the last is resolved into an unusual condensation of low-flux, probably high-redshift point sources, around a strongly lensed Herschel-ATLAS source at z = 3.26. Our results demonstrate that the higher sensitivity and higher angular resolution H-ATLAS maps provide essential information for the interpretation of candidate sources extracted from Planck sub-mm maps.