Jansky

Definition

A Jansky (Jy) is a unit of spectral flux density used in radio astronomy. It measures the amount of energy received per unit area per unit frequency from astronomical sources.

5 Must Know Facts For Your Next Test

1. 1 Jansky is equal to 10^-26 watts per square meter per hertz.
2. The unit is named after Karl Jansky, a pioneer in radio astronomy.
3. Janskys are commonly used to describe the strength of radio sources in space.
4. It allows astronomers to quantify and compare the intensity of different astronomical objects emitting radio waves.
5. Janskys are crucial for understanding phenomena like quasars, pulsars, and other celestial radio sources.

Review Questions

Related terms

Spectral Flux Density: A measure of the amount of energy emitted by an object as a function of frequency.

Radio Telescope:

An instrument that detects and analyzes radio waves from celestial objects.

Karl Jansky:

An American engineer who discovered cosmic radio waves, leading to the development of radio astronomy.