# Markarian 509

> Seyfert 1 galaxy in the constellation Aquarius

**Wikidata**: [Q11770328](https://www.wikidata.org/wiki/Q11770328)  
**Source**: https://4ort.xyz/entity/markarian-509


## References

1. SIMBAD
2. Masses and accretion rates of supermassive black holes in active galactic nuclei from the INTEGRAL survey
3. Broad band energy distribution of ROSAT detected quasars. II. Radio-quiet objects
4. Quasars in the 2MASS Second Incremental Data Release
5. A catalogue of quasars and active nuclei: 13th edition
6. The RASSâ 6dFGS catalogue: a sample of X-ray selected AGN from the 6dF Galaxy Survey
7. The Two Micron All Sky Survey (2MASS)
8. Gaia Data Release 2
9. Hunting for supermassive black holes in nearby galaxies with the Hobby-Eberly telescope
10. Host galaxy properties of the Swift BAT ultra hard X-ray selected active galactic nucleus