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Luminosity-Distances of IUE observed Active Galaxies

Published online by Cambridge University Press:  25 July 2014

Vijayakumar H Doddamani  and
P. Vedavathi
Vijayakumar H Doddamani
Affiliation:
Dept. of Physics, Bangalore University, Bangalore-560056 email: [email protected]
P. Vedavathi
Affiliation:
Dept. of Physics, Bangalore University, Bangalore-560056 email: [email protected]
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Abstract

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Active galaxies are the most luminous objects observed in the Universe and are believed to be powered by mass accretion processes taking place in the vicinity of the central Super massive black hole (MBH ≥ 108Msun). However, the details of the power generation mechanisms are not understood well yet. In this paper, we are presenting a comparative study of luminosity-distance estimations for the complete sample of active galaxies observed by IUE satellite by different methods. IUE has made UV spectroscopic observations of nearly 400 active galaxies comprising mostly Seyfert 1 galaxies and quasars. We have chosen all the active galaxies observed by IUE satellite for the study of luminosity-distance with redshift. The luminosity-distances (DL) have been calculated using the Hubbles law under non-relativistic and relativistic limits with H0 = 73 Km/sec/Mpc and Terrell (1979) also. We have found that all DL estimations are consistent with each other for z ≤ 1 and diverge for z ≥ 1. The results of cosmological calulator I and II are found to consistent with each other and higher by several factors over cosmological calculator IV and the predictions of the Hubble's law under relativistic case. We observe a kind bimodal distributions in DL for z ≤ 3.5.

Keywords

Active galaxiesSeyfert 1 galaxiesquasarslow redshiftLuminosity-distance
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 37 - 38
Copyright
Copyright © International Astronomical Union 2014 

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