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Extended Emission-Line Gas in Distant 3CR Radio Galaxies

McCarthy, Patrick J. and Spinrad, Hyron and Breugel, Wil and Djorgovski, S. and Strauss, Michael A. and Dickinson, M. (1988) Extended Emission-Line Gas in Distant 3CR Radio Galaxies. In: Cooling Flows in Clusters and Galaxies. NATO ASI Series. No.229. Springer , Dordrecht, pp. 325-329. ISBN 978-94-010-7828-3.

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We report on the results of long-slit spectroscopy and interference filter imaging of powerful 3CR radio galaxies. Narrow-band [OII]A3727 imaging often reveals extensive regions of extranuclear emission associated with these objects. The extended [OII] emission is distributed on scales of several tens of kpc, it is often more luminous than the nuclear emission, and shows large velocity gradients. We discuss the physical conditions in these nebulae and their relation to the radio source structure. In particular, we examine the ionization mechanism for the gas, and find that photoionization models reproduce the observed emission line strengths reasonably well. The source of the ionizing photons, however, is not clear; the large luminosities of the extended gas suggesting that some form of in situ ionization may be occurring. Compared to the low-z cooling flow filaments, the 3CR emission regions are larger, more luminous, and generally show higher excitation. Futhermore, the distant radio galaxies show evidence for much stronger interactions with their radio sources than is seen in nearby cooling flow filaments.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Djorgovski, S.0000-0002-0603-3087
Strauss, Michael A.0000-0002-0106-7755
Additional Information:© 1988 Kluwer Academic Publishers. Based in part on observations performed at Lick Observatory, University of California. We would like to thank Prof. A. Fabian and the Institute of Astronomy for their hospitality during the workshop. We also thank the staffs of the Lick Observatory, and the Kitt Peak National Observatory. The Lick Observatory is operated in part under the NSF grant AST-86-14510. H. S., P. McC. and M. D. acknowledge support from NSF grant AST85-13416, W.v.B. acknowledges support from NSF grant AST 84-16177, S. D. acknowledges partial support from Harvard University and M. A. S. acknowledges an NSF graduate fellowship.
Funding AgencyGrant Number
NSFAST 86-14510
NSFAST 85-13416
NSFAST 84-16177
Harvard UniversityUNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Subject Keywords:Radio Source; Radio Galaxy; Line Ratio; Large Velocity Gradient; Astronomy Department
Series Name:NATO ASI Series
Issue or Number:229
Record Number:CaltechAUTHORS:20190730-110052568
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97518
Deposited By: Tony Diaz
Deposited On:01 Aug 2019 20:36
Last Modified:16 Nov 2021 17:32

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