QMAP
Experiment QMAP is an experiment of observation of the Anisotropie S of the cosmological diffuse Fond assembled on a Ballon stratospheric and carried out by researchers of the Université of Princeton. It observed the sky in the bands Ka (31 GHz) and Q (42 GHz), with an aim of carrying out a chart of an area of the sky, from where its name ( map means “chart” in English). It was carried out in 1996, its results being published in 1998. it thus belonged to the many experiments to have confirmed the detection of the anisotropies of the cosmological diffuse bottom carried out by the Artificial satellite COBE in 1992, and to have observed them on smaller areas, but with better a resolution. In fact, QMAP observed these anisotropies on scales going from 9 to 2,5 degree S (multipolar moments L from 40 to 140).
Instrument and experiments
The expéreience used six receivers, two for the band Ka and four for the band Q. Each one had a Band-width from approximately 6 to 7 gigahertz, the detectors were field-effect transistors to heterostructure. They were cooled with 2,3 K to ensure an optimal operation. The optical system used was the same one as the experiment Saskatoon.
It carried out two observation campaign in the current of the year 1996, the first the June 16th, the second the November 8th. The first flight was carried out since Palestine (Texas) and the data acquisition lasted 4:40 approximately. The second flight left since Fort Sumner (Nouveau Mexico). The balloon reached the altitude of 30 Kilomètre S during the two flights. Its instruments functioned in a nominal way. The first flight made it possible to chart 441 square degrees, that is to say approximately 1% of the celestial Sphère, the second 83 degrees square, but with a better resolution.
References
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Official site of experiment QMAP
- First flight of QMAP: Mark Devlin and Al , Mapping the CMB I: the first flight off the QMAP experiment , Astrophysical Newspaper , 509 , L69-L72 (1998), astro-ph/9808043 See on line.
- Second flight of QMAL: Tom Herbig and Al , Mapping the CMB II: the second flight off the QMAP experiment , Astrophysical Newspaper , 509 , L73-L76 (1998), astro-ph/9808044 See on line.
- cosmological Data analysis and implications of the results: Angelica of Oliveira-Costa and Al , Mapping the CMB III: combined analysis off QMAP flights , Astrophysical Newspaper , 509 , L77-L80 (1998), astro-ph/9808045 See on line.
External bonds
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Given on expéreince QMAP, the professional page of max Tegmark