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Keck Spectroscopy of the Gravitational Lens System PG 1115+080: Redshifts of the Lensing Galaxies

Kundić, Tomislav and Cohen, Judith G. and Blandford, Roger D. and Lubin, Lori M. (1997) Keck Spectroscopy of the Gravitational Lens System PG 1115+080: Redshifts of the Lensing Galaxies. Astronomical Journal, 114 (2). pp. 507-510. ISSN 0004-6256. doi:10.1086/118489.

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The quadruple system PG 1115+080 is the second gravitational lens with a reported measurement of the Hubble constant. In addition to the primary lens, three nearby galaxies are believed to contribute significantly to the lensing potential. In this paper we report accurate redshifts for all four galaxies and show that they belong to a single group at z_d = 0.311. This group has very similar properties to Hickson's compact groups of galaxies found at lower redshifts. We briefly discuss implications for the existing lens models and derive H_0 = 52±14 km s^(-1) Mpc^(-1).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Cohen, Judith G.0000-0002-8039-4673
Blandford, Roger D.0000-0002-1854-5506
Additional Information:© 1997 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1997 April 15; revised 1997 May 13. Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the California Institute of Technology and the University of California. We thank D. W. Hogg and S. Malhotra for helpful conversations. This work was supported by NSF Grant No. AST-95-29170 and NASA Grant No. NAG-5-3834.
Funding AgencyGrant Number
NSFAST 95-29170
NASANAG 5-3834
Issue or Number:2
Record Number:CaltechAUTHORS:20190529-101258090
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95847
Deposited By: Tony Diaz
Deposited On:29 May 2019 19:35
Last Modified:16 Nov 2021 17:16

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