Removing Point Sources from Cosmic Microwave Background Maps
| Autor: | Angelica de Oliveira-Costa, Max Tegmark |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Pixel Point source Cosmic microwave background Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Current source symbols.namesake Space and Planetary Science symbols Point (geometry) Planck |
| Zdroj: | The Astrophysical Journal. 500:L83-L86 |
| ISSN: | 0004-637X |
| DOI: | 10.1086/311410 |
| Popis: | For high-precision cosmic microwave background (CMB) experiments, contamination from extragalactic point sources is a major concern. It is therefore useful to be able to detect and discard point source contaminated pixels using the map itself. We show that the sensitivity with which this can be done can often be greatly improved (by factors between 2.5 and 18 for the upcoming Planck mission) by a customized hi-pass filtering that suppresses fluctuations due to CMB and diffuse galactic foregrounds. This means that point source contamination will not severely degrade the cleanest Planck channels unless current source count estimates are off by more than an order of magnitude. A catalog of around 40,000 far infra-red sources at 857 GHz may be a useful by-product of Planck. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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