|
The GEM, Galactic Emission Mapping, is an international project with the goal of making a precise map of the electromagnetic spectrum of our galaxy at low frequencies (radio and microwaves). ==Description of the project== The GEM Radio Telescope measures the radio emission of our galaxy in five frequencies, between 408 MHz and 10 GHz, from different places of the earth. This data will be used to calibrate other telescopes, more specifically the Planck Surveyor, and will give the means to filter the Cyclotron Radiation and the free free radiation from other maps in a way that the only radiation left on the map is the Cosmic Microwave Background. The telescope is in construction at Pampilhosa da Serra, Portugal,〔Fonseca, R. ''et al.'' Site evaluation and RFI spectrum measurements in Portugal at the frequency range 0.408–10 GHz for a GEM polarized galactic radio emission experiment. ''New Astronomy'', 11(8):551-556, 2006.〕 but the receptor has already made measurements in Cachoeira Paulista, (Brasil), in Antártica, in Bishop (U.S.A.), Villa de Leyva (Colômbia) and in Tenerife (Canary Islands). The main reflector has a parabolic form of 5,5m of diameter.〔Tello, C. ''et al.'' Spillover and diffraction sidelobe contamination in a double-shielded experiment for mapping Galactic synchrotron emission. ''Astronomy and Astrophysics Supplement Series'', 145:495-508, 2000.〕 The telescope was projected and is operated by an international collaboration coordinated by the University of California, Berkeley and by the Lawrence Berkeley National Laboratory, under the guidance of George Smoot, awarded with the Nobel Prize in Physics in 2006. In Brasil, the radio telescope is under the responsibility of the Instituto Nacional de Pesquisas Espaciais ( National Institute of Spacial Research) and counts with the participation of the Astrophysics group of the Universidade Federal de Itajubá (Itajubá Federal University). Portugal joined the project in 2005 through the Instituto de Telecomunicações of Aveiro (Telecommunications institute of Aveiro), who is responsible for the planning and construction of the radio telescope. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GEM Radio Telescope」の詳細全文を読む スポンサード リンク
|