A POSSIBLE REASON OF FORMING THE VARIOUS TYPE OF SPECTRA IN EXTRAGALACTIC OBJECTS

Автор(и)

  • Yu. A. Kovalev Moscow State University, Vorobjevi gori, 119899 Moscow; Astro Space Center of the Lebedev Physical Institute, Profsoyuznaya 84/32, 117810 Moscow, Russian Federation
  • Y. Y. Kovalev Moscow State University, Vorobjevi gori, 119899 Moscow; Astro Space Center of the Lebedev Physical Institute, Profsoyuznaya 84/32, 117810 Moscow, Russian Federation

DOI:

https://doi.org/10.18524/1810-4215.1996.9.93175

Ключові слова:

galaxies, compact - galaxies, active - quasars, general.

Анотація

An analysis of multifrequency observations of 1,300 instantaneous spectra at cantimeter-decimeter waves during 7 sets for a sample of up to 200 VLBI-compact objects gives a strong experimental evidence to an old hypothesis, that a VLBI-compact jet of relativistic particles from an object's nucleus is a main reason of forming the various type of spectra inextragalactic objects. It is enough to explain all main known spectra types (steep, flattened, inverted) by two spectra components only- of a quasi stationary jet in a longitudinal magnetic field and an optically thin cloud or envelope, resulted by the jet. A combination of thesetwo components gives also complex shapes in a case of a nonstationary phase of the jet.

Посилання

Amirkhanyan V.R.: 1985, Astroph. Space Set., 108, 125.

Kellermann K.I., Pauliny-Toth U.K.: 1981, Ann. Rev. Astron. Astrophys., 19, 373.

Kovalev Yu.A.: 1983, in 'Galactic and Extragalactic Radio Astronomy', p. 39 (in Russian).

Kovalev Yu.A., et al. 1997, Astron. Astrophys. (in preparation).

Kovalev Y.Y., Larionov G.M.: 1994, Astron. Zh. Lett., 20, 3.

Kovalev Y.Y.: 1995, in 'XXVIIth YERAC, Electronic Proceedings', Cambridge University Press. (http://www.cup.cam.ac.uk/onlinepubs/YERAC/home, html)

Nesterov N.S., Kovalev Y.Y., Babak S.V., Larionov CM.: 1994, . Astron. Zh., 71, 850.

Preston R.A., et at: 1985, Astron. J., 90, 1599.

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Опубліковано

2017-11-04

Номер

Том 9 (1996)

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