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14 relations: Accretion disk, Alar Toomre, Area density, Astrophysics, Differential rotation, Epicyclic frequency, Gas, Gravitational constant, Jeans instability, Pressure, Shear force, Speed of sound, Star formation, Viktor Safronov.
Accretion disk
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
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Alar Toomre
Alar Toomre (born 5 February 1937 in Rakvere) is an Estonian-American astronomer and mathematician.
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Area density
The areal density (also known as area density, surface density, superficial density, or density thickness) of a two-dimensional object is calculated as the mass per unit area.
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Astrophysics
Astrophysics is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of the astronomical objects, rather than their positions or motions in space".
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Differential rotation
Differential rotation is seen when different parts of a rotating object move with different angular velocities (rates of rotation) at different latitudes and/or depths of the body and/or in time.
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Epicyclic frequency
In astrophysics, particularly the study of accretion disks, the epicyclic frequency is the frequency at which a radially displaced fluid parcel will oscillate.
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Gas
Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).
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Gravitational constant
The gravitational constant (also known as the "universal gravitational constant", the "Newtonian constant of gravitation", or the "Cavendish gravitational constant"), denoted by the letter, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.
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Jeans instability
In stellar physics, the Jeans instability causes the collapse of interstellar gas clouds and subsequent star formation.
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Pressure
Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
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Shear force
Shearing forces are unaligned forces pushing one part of a body in one specific direction, and another part of the body in the opposite direction.
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Speed of sound
The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.
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Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars.
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Viktor Safronov
Viktor Sergeevich Safronov (Ви́ктор Серге́евич Сафро́нов) (born Velikie Luki, Russia, 11 October 1917 – died Moscow 18 September 1999) was a Soviet astronomer who put forward the low-mass-nebula model of planet formation, a consistent picture of how the planets formed from a disk of gas and dust around the Sun.
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Safronov-Toomre Criterion, Safronov-Toomre criterion, Toomre Q, Toomre Q parameter, Toomre stability criterion, Toomre's Stability Criterion.
References
[1] https://en.wikipedia.org/wiki/Toomre's_stability_criterion
