HerMES: The SPIRE confusion limit

Details HerMES: The SPIRE confusion limit HerMES: The SPIRE confusion limit

2010-05-12

arxiv.org/abs/1005.2207v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Astronomy and Astrophysics, Herschel Special Issue, in press as a Letter; 5 pages

Scientific paper

We report on the sensitivity of SPIRE photometers on the Herschel Space Observatory. Specifically, we measure the confusion noise from observations taken during the Science Demonstration Phase of the Herschel Multi-tiered Extragalactic Survey. Confusion noise is defined to be the spatial variation of the sky intensity in the limit of infinite integration time, and is found to be consistent among the different fields in our survey at the level of 5.8, 6.3 and 6.8 mJy/beam at 250, 350 and 500 microns, respectively. These results, together with the measured instrument noise, may be used to estimate the integration time required for confusion-limited maps, and provide a noise estimate for maps obtained by SPIRE.

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