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The longest period pulsar, at 118.2 seconds, as well as one of the only known two white dwarf pulsars, AR Scorpii. [69] The first white dwarf pulsar AE Aquarii. [70] [71] The pulsar with the most stable period, PSR J0437−4715; The first millisecond pulsar with 2 stellar mass companions, PSR J0337+1715; PSR J1841−0500, stopped pulsing for ...
In 1930, Stoner derived the internal energy–density equation of state for a Fermi gas, and was then able to treat the mass–radius relationship in a fully relativistic manner, giving a limiting mass of approximately 2.19 × 10 30 kg (for μ e = 2.5). [19] Stoner went on to derive the pressure–density equation of state, which he published ...
In fluid mechanics, the force density is the negative gradient of pressure. It has the physical dimensions of force per unit volume. Force density is a vector field representing the flux density of the hydrostatic force within the bulk of a fluid. Force density is represented by the symbol f, [1] and given by the following equation, where p is ...
The five-year data release, analysis, and first NANOGrav limit on the stochastic gravitational wave background were described in 2013 by Demorest et al. [24] It was followed by the nine-year and 11-year data releases in 2015 and 2018, respectively. Each further limited the gravitational wave background and, in the second case, techniques to ...
It is defined as periodic time increase per unit time; it is a dimensionless quantity, but can be given the units of s⋅s −1 (seconds per second). [ 59 ] The spin-down rate ( P -dot) of neutron stars usually falls within the range of 10 −22 to 10 −9 s⋅s −1 , with the shorter period (or faster rotating) observable neutron stars ...
The actions by the U.S. Air Force units involved in the shootdown of about 80 Iranian drones have been described as the largest air-to-air enemy engagement by the United States in over 50 years ...
In such a system, one of the orbiting stars is a pulsar. This has two consequences: a pulsar is an extremely dense object known as a neutron star, for which gravitational wave emission is much stronger than for ordinary stars. Also, a pulsar emits a narrow beam of electromagnetic radiation from its magnetic poles. As the pulsar rotates, its ...
Former Republican presidential candidate Robert F. Kennedy Jr. gestures as he speaks ahead of Former US President and Republican presidential candidate Donald Trump at a campaign rally at the ...