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arXiv:astro-ph/0405115 (astro-ph)
[Submitted on 6 May 2004 (v1), last revised 14 Jul 2005 (this version, v2)]

Title:The Hubble constant from gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys

Authors:T. York (1), N. Jackson (1), I.W.A. Browne (1), O. Wucknitz (2), J.E. Skelton (1) ((1) Jodrell Bank, (2) Universitaet Potsdam)
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Abstract: We present deep optical observations of the gravitational lens system CLASS B0218+357, from which we derive an estimate of the Hubble constant. Extensive radio observations have reduced the degeneracies between Hubble's constant and the mass model in this lens to one involving only the position of the radio-quiet lensing galaxy relative to the lensed images. B0218+357 has an image separation of only 334 mas, so optical observations have previously been unable to resolve the lens galaxy from the bright lensed images. Using the new Advanced Camera for Surveys installed on the Hubble Space Telescope, we have measured the separation between the lens galaxy centre and the brightest image. The position found, and hence our estimate of Hubble's constant, depends on our approach to the spiral arms in B0218+357. If the most prominent arms are left unmasked, we find a value for Hubble's constant of 70+/-5 km/s /Mpc (95% confidence). If the spiral arms are masked out, we find a value of 61+/-7 km/s /Mpc (95% confidence).
Comments: Published in MNRAS. 15 pages, 7 figures. Astro-ph version now consistent with published version. Major changes include an improved noise model and combination of optical galaxy position with VLBI constraints
Subjects: Astrophysics (astro-ph)
Report number: SUB-570
Cite as: arXiv:astro-ph/0405115
  (or arXiv:astro-ph/0405115v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0405115
Journal reference: Mon.Not.Roy.Astron.Soc. 357 (2005) 124-134
Related DOI: https://doi.org/10.1111/j.1365-2966.2004.08618.x

Submission history

From: Tom York [view email]
[v1] Thu, 6 May 2004 15:16:05 UTC (271 KB)
[v2] Thu, 14 Jul 2005 11:05:41 UTC (132 KB)
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