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The Crab Pulsar was the first pulsar for which the spin-down limit was broken using several months of data of the LIGO observatory. Most pulsars do not rotate at constant rotation frequency, but can be observed to slow down at a very slow rate (3.7 × 10 −10 Hz/s in case of the Crab).
These birds are adapted to an aquatic existence with webbed feet, flattened bills, and feathers that are excellent at shedding water due to an oily coating. White-faced whistling-duck, Dendrocygna viduata (V) Black-bellied whistling-duck, Dendrocygna autumnalis; Comb duck, Sarkidiornis sylvicola (V) Northern shoveler, Spatula clypeata
Pulsar wind nebulae evolve through various phases. [2] [5] New pulsar wind nebulae appear soon after a pulsar's creation, and typically sit inside a supernova remnant, for example the Crab Nebula, [6] or the nebula within the large Vela Supernova Remnant. [7] As the pulsar wind nebula ages, the supernova remnant dissipates and disappears.
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. The common name comes from a drawing that somewhat resembled a crab with arms produced by William Parsons, 3rd Earl of Rosse , in 1842 or 1843 using a 36-inch (91 cm) telescope . [ 6 ]
An optical pulsar is a pulsar which can be detected in the visible spectrum. There are very few of these known: the Crab Pulsar was detected by stroboscopic techniques in 1969, [ 1 ] [ 2 ] shortly after its discovery in radio waves, at the Steward Observatory .
This is a list of the bird species recorded in the Bahamas. The avifauna of the Bahamas include a total of 386 species, according to Bird Checklists of the World (Avibase) as of July 2023. [1] Of them, seven are endemic, 21 have been introduced by humans, and 212 are rare or accidental.
It is located in a Pulsar wind nebula created by itself, that was caused as a remnant of the Supernova (SNR) MSH 15−52 visual approximately 1,700 years ago at the southern celestial hemisphere not visible in the northern hemisphere. [3] [4] The nebula spans about 150 light years. [5] The pulsar's spin rate is "almost 7 times per second".
The Andean cock-of-the-rock is the national bird of Peru. This is a list of the bird species recorded in Peru. The avifauna of Peru has 1883 confirmed species, of which 117 are endemic, three have been introduced by humans, and 83 are rare or vagrants. An additional 26 species are hypothetical (see below).