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A Search for High-Excitation Redshift Systems in the Absorption Spectra of Five Quasars

Bahcall, J. N. and Joss, P. C. and Cohen, J. G. (1973) A Search for High-Excitation Redshift Systems in the Absorption Spectra of Five Quasars. Astrophysical Journal, 184 . pp. 57-63. ISSN 0004-637X. doi:10.1086/152303.

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We have searched the absorption spectra of five quasars for the presence of redshift system dominated by the highly ionized doublets C iv, N v, and O vi, which could be the strongest lines produced by absorbing clouds with collisional ionization temperatures between 10^5 ° and 10^6 °K. There is at most marginal evidence for one such system apiece in the spectra of PHL 957 and 4C 05.34, which are the two quasars with the largest known emission redshifts. Highly ionized redshift systems of this type are not widespread among the five quasars we investigated; the number of redshifts found in the observed spectra is not significantly larger than the number found in similar random-number spectra. Less than 5 percent of the observed absorption lines are identified in a statistically significant way by redshift systems of this type.

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Cohen, J. G.0000-0002-8039-4673
Additional Information:© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1973 January 22; revised 1973 March 26. This work was initiated while one of us (J. N. B.) was a visiting professor in the astronomy department of the University of California at Berkeley; J. N. B. wishes to express his gratitude for the hospitality and stimulation provided by the members of the Berkeley astronomy department. This work was supported in part by NSF grant 16147 A#1 and the Miller Institute for Basic Research.
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NSF16147 A#1
Miller Institute for Basic Research in ScienceUNSPECIFIED
Subject Keywords:quasi-stellar sources or objects — redshifts
Record Number:CaltechAUTHORS:20190529-103834433
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95879
Deposited By: George Porter
Deposited On:29 May 2019 20:17
Last Modified:16 Nov 2021 17:16

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