Chinese space telescope to observe pulsars in Milky Way
China will launch a space telescope, the X-ray modulation telescope (HXMT) to observe pulsars in the Milky Way galaxy, according to scientists.
“We are still not clear inside the pulsars,” said Zhang Shuangnan, senior scientist and director of HXMT Key Particle Astrophysics Laboratory of the Chinese Academy of Sciences.
“Current physical laws can not adequately describe the substance in the state of a pulsar, because no laboratory on Earth can create such a high density than a pulsar. We must make more observations about the pulsars,” Zhang said.
Fangjun Lu, head of HXMT’s useful load design says long-term tracking of pulsars could help unravel the mystery of their energy sources.
A pulsar is so strange that when the first was discovered, it was mistaken for alien signals. There are still many mysteries about these types of stars.
It is a highly magnetized rotating neutron star that emits two rays of electromagnetic radiation. This radiation can observe that when the points of beam transmission towards the Earth. It is the same as that of a lighthouse can be seen only when the light is directed to an observer.
A neutron star is the collapsed nucleus of a large star. Neutron stars are the smallest and densest stars imaginable. Although they generally have a radius of 10 km, they can have a mass approximately double that of the sun.
A neutron star is so dense that a teaspoon of its material would have the mass of a mountain more than 3,000 meters high, about 900 times the mass of the Great Pyramid of Giza.
An unexpected number of gamma rays emanating from the center of our galaxy – unexpected, for now, astronomers still do not understand what produces this high energy radiation. The main options cover the entire spectrum of exotic: gamma pulsars compared to dark matter particles. Recent studies open the way for pulsars and reduce the playing field of dark matter.
The center of the galactic sphere in the form of a glow- as seen by the Fermi space telescope is superimposed over a visible light image of the Milky Way.
NASA / A. Mellinger / Central Michigan Univ. / T. Linden / Univ. Chicago
The large area telescope of Fermi was first painted an image of the gamma-ray sky. Several teams of scientists analyzing Fermi data subtract all known sources of this card, such as pulsars, black holes of stellar mass and the emissions of interstellar gas dust. But even after all the sources we know have been removed, our galactic center has nevertheless emerged as a bright gamma ray. (The Andromeda galaxy has recently been discovered as a similar central brightness).
Some groups have suggested that gamma rays could be produced by collisions of dark matter particles. Unlike ordinary matter, dark matter particles are their own antimony particles. If ever the two must comply, they annihilate, producing gamma rays and perhaps other subatomic secondary particles.
However, since dark matter particles have not yet been detected in the laboratory (where they are not marked by collisions with each other, but by rare interactions with ordinary matter), many scientists hesitated to accept this explanation. Pulse, which also produce gamma rays are the preferred alternative. But pulsars have proved to be intransigent: attempts to detect in radio wavelengths, in sufficient numbers to explain the excesses failed.
Mattia di Mauro, Eric Charles and Matthew Wood (SLAC National Accelerator Lab) and the rest of the Fermi-LAT Collaboration published a new study to select the gamma-ray candidate 7 and a half years of Fermi observations analyzed using the most Recent pipeline data, known as the “Pass 8”. The paper was presented to Astrophysical Journal (pre-print here).