Engineering topics
Publications and source records attributed to Sartori, L..
Two types of quasars are postulated: type I, the vast majority of quasars, which are highly luminous and cosmologically distant, as shown by their redshifts; type II, a dwarf branch, that are products of a few remarkable explosions in nearby galaxies. It is shown that this hypothesis is consistent with redshift statistics and suggests a possible interpretation of such objects as BL Lac and OJ 287.
The principal optical properties of type I supernovae are summarized. These include the light curve and the spectrum. The spectra consist of broad bands with very little continuum. According to the theory presented, the observed light is principally fluorescence, excited in the medium surrounding the supernova by ultraviolet radiation originating from the explosion. It is proposed that the spectrum that impinges on the fluorescent medium while emission is taking place must fall abruptly across the Lyman edge of He II. Such a filtering action is plausibly provided by a much denser internal region, rich in helium, immediately surrounding the exploding object. This will form a Stromgren sphere during the time the intense UV pulse is passing through it. The dense region also slows down the photons below the edge by Thomson scattering, thereby spreading out the UV pulse in time. Various proposed mechanisms for the production of ionization in the Gum nebula are discussed.
Kinematic illusions in connection with retardation effects involving extragalactic sources with varying microwave output, noting occurrence in quasar 3C 279
Synchrotron source spectra natural frequency cut- off in absence of self absorption and electron energy cut-offs, discussing pulsar NP 0532
Synchrotron model limitation for nonthermal spectra, demonstrating restriction to small pitch angles and strong fields
Supernova light emitted from surrounding gas layer, describing gas density role in type I and type II events
Quasi-stellar sources sizes noting no universally valid direct relation between image variation and physical source dimensions
Thermal X rays and nonthermal radio sources analogy, discussing Crab Nebula
Visible spectrum of radiation release from type I supernova outburst