Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1106c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #11.06; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
The CMB signal in the WMAP sky maps is primarily contaminated by microwave emission from extragalactic point sources on small angular scales. Driven by the goal to provide a clean CMB map for cosmological analysis, we performed a series of extragalactic point source searches in the WMAP Q-, Vand W-band maps, using a method that cancels the CMB anisotropy signal. These bands are chosen because they have relatively higher resolution and less foreground contamination among the WMAP bands. We reported our result for the search using WMAP first-year Vand W-band sky maps in the 207th AAS meeting; 30 point sources were detected, of which 27 were identified with catalogued objects (1σ = 2.2’). With the release of WMAP three-year data this year, we repeated this 2-band search and found 63 point sources (53 identified, 1σ = 1.3’). We further did a 3-band search using Q-, Vand W-band sky maps. 254 point sources (99 identified, 1σ = 1.7’) and 470 point sources (204 identified, 1σ =1.5’) were found in the WMAP first-year and three-year data respectively. A major advantage of this method is that it has no CMB signal dependency; the noise comes primarily from the detector noise that can be reduced as 1/√t by integrating longer. As the three-year WMAP data is nearly √3 times less noisy than the first year data, we did find more than √3 times as many sources in the three-year search. VLA and ATCA observations were proposed and approved for all the sources without solid identification in the 2-band search. Observations on currently unidentified sources in the 3-band search will be proposed in the near future.
We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA). Support for LAMBDA is provided by the NASA Office of Space Science.
Chen Xi
Wright Louis E.
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