In the first place, NASA's critics pointed out, ultraviolet radiation accounts for no more than a tenth of thz radiation from a galaxy.
From the time.com
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Terahertz: one trillion periods per second
In physics, terahertz radiation refers to electromagnetic waves sent at frequencies in the terahertz range. It is also referred to as submillimeter radiation, terahertz waves, terahertz light, T-rays, T-light, T-lux and THz. ...
The hertz (symbol: Hz) is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of sine wave, particularly those used in radio and audio applications.