Related Experiment Video
Updated: Jul 27, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Chandra Detection of Massive Black Holes in Galactic Cooling Flows
Abstract:
Anticipating forthcoming Chandra X-ray observations, we describe the continuation of interstellar cooling flows deep into the cores of elliptical galaxies. Interstellar gas heated to T>1 keV in the potential of massive black holes (r less, similar50 pc) should be visible unless thermal heating is diluted by nonthermal pressure. Since our flows are subsonic near the massive black holes, distributed cooling continues within approximately 300 pc. Dark, low-mass stars formed in this region may be responsible for some of the mass attributed to central black holes.
Related Concept Videos
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Detection of Black Holes
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Magnetic Field Lines
Magnetic field lines follow several hard-and-fast rules:
Divergence and Curl of Magnetic Field
Gravitation Between Spherically Symmetric Masses
Couette Flow

