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BL Lac

Index BL Lac

BL Lac can mean two things. [1]

4 relations: Active galactic nucleus, BL Lacertae, BL Lacertae object, Galaxy.

Active galactic nucleus

An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion—and possibly all—of the electromagnetic spectrum, with characteristics indicating that the excess luminosity is not produced by stars.

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BL Lacertae

BL Lacertae or BL Lac is a highly variable, extragalactic AGN (active galactic nucleus or active galaxy).

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BL Lacertae object

A BL Lacertae object or BL Lac object is a type of galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae.

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Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

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Redirects here:

BL Lac (disambiguation).

References

[1] https://en.wikipedia.org/wiki/BL_Lac

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