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innermoststablecircularorbit
innermost stable circular orbit
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INNERMOST STABLE CIRCULAR ORBIT - The Innermost stable circular orbit (often called the ISCO) is the smallest circular orbit in which a test particle can stably orbit a massive object...
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The Innermost stable circular orbit (often called the ISCO) is the smallest circular orbit in which a test particle can stably orbit a massive object in general relativity. The location of the ISCO, the ISCO-radius ( * * * * * r * * * i * s * c * o * * * * * * {\displaystyle r_{\mathrm {isco} }} * ), depends on the angular momentum (spin) of the central object. * The ISCO plays an important role in black hole accretion disks since it marks the inner edge of the disk. * For a non-spinning massive object, where the gravitational field can be expressed with the Schwarzschild metric, the ISCO is located at,* * * * * r * * * i * s * c * o * * * * = * * * * 6 * * G * M * * * c * * 2 * * * * * = * 3 * * R * * S * * * , * * * {\displaystyle r_{\mathrm {isco} }={\frac {6\,GM}{c^{2}}}=3R_{S},} * where * * * * * R * * S * * * * * {\displaystyle R_{S}} * is the Schwarzschild radius of the massive object with mass * * * * M * * * {\displaystyle M} * . Thus, even for a non-spinning object, the ISCO radius is only three times the Schwarzschild radius, * * * * * R * * S * * * * * {\displaystyle R_{S}} * , suggesting that only black holes and neutron stars have innermost stable circular orbits outside of their surfaces. As the angular momentum of the central object increases, * * * * * r * * * i * s * c * o * * * * * * {\displaystyle r_{\mathrm {isco} }} * decreases. * Circular orbits are still possible between the ISCO and the photon sphere, but they are unstable. The photon sphere has a radius of * * * * * r * = * * * * 3 * * G * M * * * c * * 2 * * * * * = * * * * 3 * * R * * S * * * * 2 * * * . * * * {\displaystyle r={\frac {3\,GM}{c^{2}}}={\frac {3R_{S}}{2}}.} * For a massless test particle like a photon, the only possible circular orbit is exactly at the photon sphere, and is unstable.... |