Difficulties in forming the pulsar theory
The theory faces great difficulties. Now the main successes in the study of pulsars rightfully belong to observers.
There are reports of new pulsars all the time. There are already 50 of them. Astronomers from Cambridge and the staff of the Molongo Observatory at the University of Sydney have discovered especially many pulsars. Three Australians— A. Vognan, M. Laju and R. Wilebinsky, were lucky enough to discover 22 pulsars.
In the radio range, the sub-pulse of the NP 0531 pulsar has a fine structure: It consists of shorter pulses repeated over several periods (shown by arrows). Sometimes repeated short pulses lasting only 10 microseconds are observed.
All pulsars are strongly concentrated towards the galactic equator, and their galactic latitudes, with the exception of three, are less than 40°. Among the recently discovered pulsars, two (MR 1154-62 and MR 1240-64) are much further away than the others. These are extremely powerful sources, and their luminosities are about 100 times higher than those of some other pulsars. A. Vognan, M. Laj and R. Wilebinsky note in their articles that there are apparently a lot of pulsars, but their signals are difficult to distinguish against the background of cosmic noise.
It is noted that the amplitude of the pulses varies with time. How does this happen? J. Taylor, M. Jura and J. Haguenin (USA) found that the radiation of some pulsars is modulated by a lower frequency. They carried out their observations on the 92-meter antenna of the National Radio Astronomy Observatory using a multi-channel radiometer. According to American scientists, such a modulation of pulsar radiation can be caused by fluctuations in the surrounding plasma.
Pulse modulation of pulsars with very long periods has been detected. Some pulsars, such as CP 1919 + 21, MP 0253, disappear for many days and then reappear. This fact has not yet been explained.
In all known pulsars, the pulse repetition period is slowly increasing. Therefore, it is natural to assume that a larger period corresponds to a larger age of the pulsar. Then the youngest pulsar should be NP 0531 in the Crab Nebula, which has the shortest period — only 33 milliseconds. Its age is well known: there is a record of the birth of the Crab Nebula in the Chinese chronicles. The nebula was created by a supernova explosion on May 20, 1054.
The remaining pulsars have much longer periods and are estimated to be millions of years old. The fact that they are not associated with Supernova remnants (except for pulsar PSR 0833-45) can be understood: the expanding shells of Supernovae dissipate over several tens of thousands of years. Real free porn movies https://exporntoons.net online porn USA, UK, AU, Europe.
There are reports of new pulsars all the time. There are already 50 of them. Astronomers from Cambridge and the staff of the Molongo Observatory at the University of Sydney have discovered especially many pulsars. Three Australians— A. Vognan, M. Laju and R. Wilebinsky, were lucky enough to discover 22 pulsars.
In the radio range, the sub-pulse of the NP 0531 pulsar has a fine structure: It consists of shorter pulses repeated over several periods (shown by arrows). Sometimes repeated short pulses lasting only 10 microseconds are observed.
All pulsars are strongly concentrated towards the galactic equator, and their galactic latitudes, with the exception of three, are less than 40°. Among the recently discovered pulsars, two (MR 1154-62 and MR 1240-64) are much further away than the others. These are extremely powerful sources, and their luminosities are about 100 times higher than those of some other pulsars. A. Vognan, M. Laj and R. Wilebinsky note in their articles that there are apparently a lot of pulsars, but their signals are difficult to distinguish against the background of cosmic noise.
It is noted that the amplitude of the pulses varies with time. How does this happen? J. Taylor, M. Jura and J. Haguenin (USA) found that the radiation of some pulsars is modulated by a lower frequency. They carried out their observations on the 92-meter antenna of the National Radio Astronomy Observatory using a multi-channel radiometer. According to American scientists, such a modulation of pulsar radiation can be caused by fluctuations in the surrounding plasma.
Pulse modulation of pulsars with very long periods has been detected. Some pulsars, such as CP 1919 + 21, MP 0253, disappear for many days and then reappear. This fact has not yet been explained.
In all known pulsars, the pulse repetition period is slowly increasing. Therefore, it is natural to assume that a larger period corresponds to a larger age of the pulsar. Then the youngest pulsar should be NP 0531 in the Crab Nebula, which has the shortest period — only 33 milliseconds. Its age is well known: there is a record of the birth of the Crab Nebula in the Chinese chronicles. The nebula was created by a supernova explosion on May 20, 1054.
The remaining pulsars have much longer periods and are estimated to be millions of years old. The fact that they are not associated with Supernova remnants (except for pulsar PSR 0833-45) can be understood: the expanding shells of Supernovae dissipate over several tens of thousands of years. Real free porn movies https://exporntoons.net online porn USA, UK, AU, Europe.