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Radio Wavelengths and the Universe
10
Flashcards
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7 mm
This wavelength corresponds to the SiO maser emission, providing detailed study of the dynamic environments in late-type stars and the process of mass loss from these stars.
6 cm
Important for the study of radio recombination lines, particularly in the context of H II regions around hot young stars and the structure of the early universe.
9 cm
This wavelength enables studies of the J=4-2 transition of NH3 (ammonia), which is a thermometer for the interstellar medium, providing temperature measurements of gas clouds where stars are forming.
18 cm
This wavelength is important for observing the OH (hydroxyl) molecule, giving rise to the study of masers and molecular clouds in the interstellar medium.
1.35 cm
Known for water vapor maser emission useful in the study of star-forming regions, the dynamics of evolved stars, and active galactic nuclei.
3 mm to 1 m
This range of wavelengths encompasses the microwave part of the spectrum, important for observing various molecular transitions, the Cosmic Microwave Background, and cold dust.
90 cm
The long wavelength makes it suited for studies of the non-thermal emission from pulsars, supernova remnants, and some active galactic nuclei, which emit strongly at these wavelengths.
21 cm
This wavelength corresponds to the hyperfine transition of neutral hydrogen, allowing us to map out the structure of the galaxy and detect cold gas in the early universe.
4.9 mm
It is important for observing the CS (carbon monosulfide) J=2-1 transition, giving insights into dense interstellar medium and star-forming cores.
2.6 mm
This wavelength is used to detect the CO (Carbon Monoxide) J=1-0 transition, key for tracing molecular hydrogen in the galaxy, as H2 has no dipole moment and is hard to detect directly.
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