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CfA 1.2 m Millimeter-Wave Telescope
The 1.2 meter Millimeter-Wave Telescope at the Harvard-Smithsonian Center for Astrophysics and its twin instrument at CTIO in Chile have been studying the distribution and properties of molecular clouds in our Galaxy and its nearest neighbours since the 1970s. The telescope is nicknamed "The Mini" because of its unusually small size. At the time it was built, it was the smallest radio telescope in the world. Together, "The Mini" and its twin in Chile have obtained what is by far the most extensive, uniform, and widely used Galactic survey of interstellar carbon monoxide (CO). "The Mini" is currently in operation from October to May each year.
==Purpose==
Interstellar CO is the best general tracer of the largely invisible molecular hydrogen that constitutes most of the mass in molecular clouds. Hydrogen is the simplest and most abundant element in the universe, and molecular hydrogen (H2) is by far the most abundant molecule. Unfortunately, under typical interstellar conditions H2 does not emit at radio or millimeter wavelengths.
CO, however, the second most abundant ingredient in molecular clouds, has a rich and strong millimeter-wave spectrum and it seems to maintain a fairly constant ratio with H2 of about 1:100,000. For this reason, CO has become the standard tracer or "stain" for the invisible H2 which constitutes most of the molecular mass.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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