Back to Search
Start Over
Asymfast, a method for convolving maps with asymmetric main beams
- Source :
- Physical Review D, Physical Review D, American Physical Society, 2004, 69, pp.123008. ⟨10.1103/PhysRevD.69.123008⟩
- Publication Year :
- 2003
- Publisher :
- arXiv, 2003.
-
Abstract
- We describe a fast and accurate method to perform the convolution of a sky map with a general asymmetric main beam along any given scanning strategy. The method is based on the decomposition of the beam as a sum of circular functions, here Gaussians. It can be easily implemented and is much faster than pixel-by-pixel convolution. In addition, Asymfast can be used to estimate the effective circularized beam transfer functions of CMB instruments with non-symmetric main beam. This is shown using realistic simulations and by comparison to analytical approximations which are available for Gaussian elliptical beams. Finally, the application of this technique to Archeops data is also described. Although developped within the framework of Cosmic Microwave Background observations, our method can be applied to other areas of astrophysics.<br />Comment: 9 pages, 4 figures, Phys. Rev. D, in press
- Subjects :
- Physics
Nuclear and High Energy Physics
Archeops
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
business.industry
Gaussian
Cosmic microwave background
Astrophysics (astro-ph)
FOS: Physical sciences
Astrophysics
01 natural sciences
Transfer function
Convolution
Computational physics
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
symbols.namesake
Optics
0103 physical sciences
symbols
Trigonometric functions
business
010303 astronomy & astrophysics
Microwave
Beam (structure)
Subjects
Details
- ISSN :
- 15507998 and 15502368
- Database :
- OpenAIRE
- Journal :
- Physical Review D, Physical Review D, American Physical Society, 2004, 69, pp.123008. ⟨10.1103/PhysRevD.69.123008⟩
- Accession number :
- edsair.doi.dedup.....52951a285014a3239854b1ceec6f63c9
- Full Text :
- https://doi.org/10.48550/arxiv.astro-ph/0310260