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Gravitational Lens B1608+656. I. V-, I-, and H‐Band Hubble Space Telescope Imaging

Surpi, G. and Blandford, R. D. (2003) Gravitational Lens B1608+656. I. V-, I-, and H‐Band Hubble Space Telescope Imaging. Astrophysical Journal, 584 (1). pp. 100-109. ISSN 0004-637X. doi:10.1086/345592.

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We present a multiwavelength analysis of high-resolution observations of the quadruple lens B1608+656 from the Hubble Space Telescope archive, acquired with WFPC2 through filters F606W (V band) and F814W (I band) and with NIC1 in filter F160W (H band). In the three bands, the observations show extended emission from the four images of the source in a ringlike configuration that surrounds the two resolved, ensing galaxies. B1608+656 was discovered as a double-lobed radio source and later identified as a poststarburst galaxy in the optical. Based on photometry and optical spectroscopy we estimate that the stellar population of the source has an age of ~500 Myr. This provides a model for the spectrum of the source that extends over spectral regions where no observations are available and is used to generate Tiny Tim point-spread functions (PSFs) for the filters. Deconvolutions performed with the Lucy-Richardson method are presented, and the limitations of these restorations are discussed. V-I and I-H color maps show evidence of extinction by dust associated with one of the lensing galaxies, a late-type galaxy presumably disrupted after its close encounter with the other lens, an elliptical galaxy. The extinction affects the two lens galaxies and two of the four multiple images. The diagnostic of wavelength-dependent effects in the images shows that corrections for contamination with light from the lenses, extinction, and PSF convolution need to be applied before using the extended structure in the images as a constraint on lens models. We will present the restoration of the images in a subsequent paper.

Item Type:Article
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URLURL TypeDescription Paper
Blandford, R. D.0000-0002-1854-5506
Alternate Title:The Gravitational Lens B1608+656: I. V, I, and H-band HST Imaging
Additional Information:© 2003 The American Astronomical Society. Received 2001 November 6; accepted 2002 October 16. We thank Paul Schechter and Chris Fassnacht for the acquisition of the B1608+656 HST data analyzed here and for their encouragement and comments on this manuscript. We thank Eric Agol and Leon Koopmans for discussions and also comments on the presentation that led to an improvement in the manuscript. We are also grateful to Gustavo Bruzual for providing data of the starburst models and Chris Fassnacht for providing B1608+656 spectral data. This material is based on work supported by the NSF under awards AST 95-29170 and AST 99-00866 and NASA under contract NAG 5-7007. G. S. acknowledges support from the CONICET in Argentina.
Funding AgencyGrant Number
NSFAST 95-29170
NSFAST 99-00866
NASANAG 5-7007
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)UNSPECIFIED
Subject Keywords:dust, extinction — galaxies: individual (B1608+656) — gravitational lensing
Issue or Number:1
Record Number:CaltechAUTHORS:20190604-081802705
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Official Citation:G. Surpi and R. D. Blandford 2003 ApJ 584 100
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96099
Deposited By: Tony Diaz
Deposited On:04 Jun 2019 18:28
Last Modified:16 Nov 2021 17:18

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