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Background Subtraction Uncertainty from Submillimetre to Millimetre Wavelengths

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arxiv 1406.2921 v1 pith:K3LIDCUJ submitted 2014-06-11 astro-ph.GA astro-ph.CO

classification astro-ph.GAastro-ph.CO
keywords backgrounduncertaintyaperturecalculateemissionfluxmillimetresubmillimetre
verification ladder T0 review T1 audit T2 compute T3 formal
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Photometric observations of galaxies at submillimetre to millimetre wavelengths (50 - 1000 GHz) are susceptible to spatial variations in both the background CMB temperature and CIB emission that can be comparable to the flux from the target galaxy. We quantify the residual uncertainty when background emission inside a circular aperture is estimated by the mean flux in a surrounding annular region, assumed to have no contribution from the source of interest. We present simple formulae to calculate this uncertainty as a function of wavelength and aperture size. Drawing on examples from the literature, we illustrate the use of our formalism in practice and highlight cases in which uncertainty in the background subtraction needs to be considered in the error analysis. We make the code used to calculate the uncertainties publicly available on the web.

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Cited by 1 Pith paper

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    astro-ph.CO 2019-08 conditional novelty 5.0 of 10

    Resonant photon-to-axion conversion in galaxy cluster magnetic fields creates a polarized CMB distortion that future experiments could use to constrain ALP couplings two orders of magnitude better than current bounds.

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