Research Papers (JVN)
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Item Single exhaust model for backward emission in doppler quasars(American Astronomical Society, 1983-10-01) Narlikar, J. V.; Subramanian, KandaswamyThis paper provides an astrophysical scenario for Hoyle's (1980) conjecture that quasars ejected at high velocities from active galactic nuclei predominantly radiate in a narrow backward cone. Through such backward emission, local Doppler theory can explain the fact that no blueshifted quasars are seen. It is held that a fast moving quasar encounters a strong ram pressure from the intergalactic medium in the forward direction which suppresses the forward exhaust. Attention is given to the hydrodynamic, gravitation theory, and radiation requirement constraints on the model, which is shown to accommodate them over a comfortable range of parameters, and which also helps in the understanding of some of the observable properties of quasars.Item Observational limitations of the Doppler theory of quasars(American Astronomical Society, 1982-09-13) Narlikar, J. V.; Subramanian, KandaswamyItem Doppler interpretation for close pairs and compact groups of quasars(American Astronomical Society, 1989-03-01) Narasimha, D.; Narlikar, J. V.We consider a Doppler model to account for (a) abnormal concentration of quasars in a given part of the sky and (b) the presence of two quasars with very nearly equal redshifts lying close to each other. The ejection parameters are explicitly determined and are shown to be reasonable for the nine quasars in the 1146+111 field. This example illustrates both (a) and (b). It is suggested that these calculations be carried out for quasars usually believed to be gravitationally lensed, as well as to other fields containing anomalously high concentration of quasars.Item Noncosmological redshifts: theoretical alternatives(Proceedings of H.C. Arp's Sixtieth Birthday Symposium at Venice, 1988-03-12) Narlikar, J. V.Starting from the various alternative theoretical interpretations offered for redshifts, this paper describes two models in some detail. The first model belongs to conventional physics and makes use of the Doppler effect. The second model makes use of the variable mass hypothesis arising from the Hoyle-Narlikar theory of gravitation. Some observable consequences of these models and testable predictions are briefly outlined.