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HerMES: The SPIRE confusion limit

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Authors
Nguyen, H.
Schulz, B.
Levenson, L.
Amblard, A.
Arumugam, V.
Aussel, H.
Babbedge, T.
Blain, A.
Bock, J.
Boselli, A.
Buat, V.
Castro-Rodriguez, N.
Cava, A.
Chanial, P.
Chapin, E.
Clements, D.
Conley, A.
Conversi, L.
Cooray, A.
Dowell, C.
Dwek, E.
Eales, S.
Elbaz, D.
Fox, M.
Franceschini, A.
Gear, W.
Glenn, J.
Griffin, M.
Halpern, M.
Hatziminaoglou, E.
Ibar, E.
Isaak, K.
Ivison, R.
Lagache, G.
Lu, N.
Madden, S.
Maffei, B.
Mainetti, G.
Marchetti, L.
Marsden, G.
Marshall, J.
O'Halloran, B.
Oliver, S.
Omont, A.
Page, M.
Panuzzo, P.
Papageorgiou, A.
Pearson, C.
Perez Fournon, I.
Pohlen, M.
Rangwala, N.
Rigopoulou, D.
Rizzo, D.
Roseboom, I.
Rowan-Robinson, M.
Scott, D.
Seymour, Nick
Shupe, D.
Smith, A.
Stevens, J.
Symeonidis, M.
Trichas, M.
Tugwell, K.
Vaccari, M.
Valtchanov, I.
Vigroux, L.
Wang, L.
Ward, R.
Wiebe, D.
Wright, G.
Xu, C.
Zemcov, M.
Date
2010
Type
Journal Article

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Citation
Nguyen, H. and Schulz, B. and Levenson, L. and Amblard, A. and Arumugam, V. and Aussel, H. and Babbedge, T. et al. 2010. HerMES: The SPIRE confusion limit. Astronomy and Astrophysics. 518 (2).
Source Title
Astronomy and Astrophysics
DOI
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Department of Physics and Astronomy
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Abstract

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 µm, 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. © 2010 ESO.