A mechanism of formation of globular clusters in the corona of a giant elliptical galaxy

Leningrad State University. Translated from Astrofizika, Vol. 32, No. 2, pp. 267–275, March–April, 1990.     

On the evolution of a system of intergalactic clouds

The presence of L _a -forests in the spectra of quasars is considered as proof of the fragmentary structure of the intergalactic medium. The masses of the clumps (of clouds) will increase as they merge together. Once the radial concentration of neutral hydrogen in a cloud attains its critical value, star formation begins, and the cloud turns into a galaxy. Certain physical properties of clouds are considered and a new approach to the investigation of the evolution of systems of clouds is proposed.Translated from Astrofizika, Vol. 37, No. 1, pp. 35–42, January–March, 1994.     

Fractal structure of clouds forming the Lα forest in quasar spectra

It follows from observations that the clouds forming the L_α forest have a hierarchical structure. It is suggested that their structure is not only hierarchical, but also fractal. The relationship between the radial concentration of neutral hydrogen N(HI) and the concentration of clouds having the same value of N(HI), well known from observation, is explained on this basis. The fractal dimension of D = 2.5 ± 0.2 is estimated from observational data and calculations. Translated fromAstrofizika, Vol. 40, No. 1, pp. 29–37, February, 1997.