NGC 4151 is an intriguing spiral galaxy, discovered by William Herschel in 1787. Modern images show an intense central core surrounded by an oval ring of stars, dust, and gas. Red splotches throughout ...

This composite image shows the central region of the spiral galaxy NGC 4151, dubbed the “Eye of Sauron” by astronomers for its similarity to the eye of the malevolent character in The Lord of the ...

Priors for the inclination of the disk come from the kinematic modelling of the emission lines in the outflow cone 23,24. Despite the differences in position angle from the different modelling ...

Monster black holes lurking within the core of galaxies offer a new way to measure how far many objects in the universe are from Earth, astronomers report on Wednesday—and with much better accuracy ...