Facts about NGC 4151

1. 08

   Emission line mapping of NGC 4151 shows evidence of a rotating disk of ionized gas within 100 light-days of the central black hole, with rotational velocities reaching 5000 kilometers per second.

   NGC 4151May 14shareastronomymeasurementblackholes
2. 07

   Variability studies spanning decades show that NGC 4151's X-ray luminosity has fluctuated by a factor of roughly 10, making it one of the most variable active galactic nuclei in the nearby universe.

   NGC 4151May 14sharevariabilityxrayagn
3. 06

   Radio observations at 5 GHz revealed that NGC 4151 produces double-lobed radio jets extending roughly 40,000 light-years from its central active galactic nucleus.

   NGC 4151May 14shareradiojetsmeasurement
4. 05

   Ultraviolet observations show that NGC 4151 experienced a dramatic dimming of approximately 90 percent in its ultraviolet flux between 1995 and 2000, indicating significant changes in the accretion activity around its black hole.

   NGC 4151May 14shareastronomymeasurementvariability
5. 04

   In 1997, spectroscopic observations revealed that NGC 4151 contains a dusty torus of material surrounding its central engine with an estimated mass of approximately 2.5 million solar masses.

   NGC 4151May 14shareastronomyobservationmeasurement
6. 03

   Located approximately 40.6 million light-years away in the constellation Canes Venatici, NGC 4151 was first catalogued by William Herschel in 1787.

   NGC 4151May 14shareastronomyhistorydistance
7. 02

   Observations from the Hubble Space Telescope revealed that NGC 4151 displays a dramatic outflow of ionized gas traveling at speeds exceeding 1000 kilometers per second from its active galactic nucleus.

   NGC 4151May 14shareastronomymeasurementdynamics
8. 01

   The supermassive black hole at the heart of NGC 4151 has a mass of approximately 43.8 million solar masses based on observations from the Chandra X-ray Observatory.

   NGC 4151May 14shareastronomymeasurementblackhole