# Markarian 501

> galaxy with a spectrum extending to the highest gamma rays

**Wikidata**: [Q6770566](https://www.wikidata.org/wiki/Q6770566)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Markarian_501)  
**Source**: https://4ort.xyz/entity/markarian-501


## References

1. SIMBAD
2. VizieR
3. The K‐Band Galaxy Luminosity Function
4. Freebase Data Dumps. 2013
5. Redshifts for a sample of radio-selected poor clusters
6. The GALEX Ultraviolet Atlas of Nearby Galaxies
7. CGRaBS: An All‐Sky Survey of Gamma‐Ray Blazar Candidates
8. Gaia Data Release 2
9. The Two Micron All Sky Survey (2MASS)
10. The SDSS Photometric Catalog, Release 7
11. Hunting for supermassive black holes in nearby galaxies with the Hobby-Eberly telescope
12. The second realization of the international celestial reference frame by very long baseline interferometry
13. Gaia Data Release 2. Summary of the contents and survey properties