The quasars are neutron stars embedded in clouds of hydrogen

The accretion of a cloud of hydrogen at the surface of a small, heavy star produces a high energy mostly dissipated by electromagnetic radiation. The combination of the absorption and the redshift of this radiation by hydrogen explains all spectral observations: shapes of the broad lines, and their anti-correlation with the radio-loudness, lack of lines in front of the Lyman forest, value zb = 0.062 of the periodicity of the redshifts, correlation of a high redshift with a thermal spectrum attributed to dust. These properties are deduced from usual laws of physics without new parameters, they do not require any non baryonic matter.