67 research outputs found
Quasars: Active nuclei of young galaxies
The hypothetical properties of 'young' galaxies and possible methods of observing them are discussed. It is proposed that star formation first takes place in the central regions of protogalaxies which may appear as quasar-like objects. An evolutionary scheme is outlined in which the radio quasars are transformed in time into the nuclei of radio galaxies
On the continuing stellar formation in the central regions of some globular clusters and their relation to the pulsars
The discrepancy between the predicted and observed quantities of gas in the central regions of massive globular clusters is discussed. It is hypothesized that star formation continues in the central regions by means of gas released during stellar evolution or trapped by the central region when the globular clusters pass through the center of the galaxy. Nine globular clusters are indicated at distances less than 1000 ps from which radio pulsars or X-ray sources are observed. It is argued that they could have formed relatively recently in closed pairs in the central regions and then ejected at the stage of supernova bursts with velocities over 100 ks/s
Dependence of the optical continuous spectrum of quasars on their red-shift
Dependence of optical continuous spectrum of quasi-stellar sources on red shif
Blind search for the real sample: Application to the origin of ultra-high energy cosmic rays
We suggest a method for statistical tests which does not suffer from a
posteriori manipulations with tested samples (e.g. cuts optimization) and does
not require a somewhat obscure procedure of the penalty estimate. The idea of
the method is to hide the real sample (before it has been studied) among a
large number of artificial samples, drawn from a random distribution expressing
the null hypothesis, and then to search for it as the one demonstrating the
strongest hypothesized effect. The statistical significance of the effect in
this approach is the inverse of the maximal number of random samples at which
the search was successful. We have applied the method to revisit the problem of
correlation between the arrival directions of ultra-high energy cosmic rays and
BL Lac objects. No significant correlation was found.Comment: 4 pages, 1 figure, accepted to ApJ Letter
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