The redshift of the gravitationally lensed radio source PKS 1830-211

C. Lidman, F. Courbin, G. Meylan, T. Broadhurst, Brenda Louise Frye, W. J W Welch

Research output: Contribution to journalArticle

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Abstract

We report on the spectroscopic identification and the long-awaited redshift measurement of the heavily obscured, gravitationally lensed radio source PKS 1830-211, which was first observed as a radio Einstein ring. The northeast component of the doubly imaged core is identified, in our infrared spectrum covering the wavelength range 1.5-2.5 μm, as an impressively reddened quasar at z = 2.507 ± 0.002. The mass contained within the Einstein ring radius is M(r < 2.1 h-1 kpc) = 6.3 × 1010 h-1 M⊙ for ΩM = 1 or M(r < 2.4 h-1 kpc) = 7.4 × 1010 h-1 M⊙ for ΩM = 0.3. Our redshift measurement, together with the recently measured time delay (Lovell et al.), means that we are a step closer to determining H0 from this lens. Converting the time delay into H0 by using existing models leads to high values of the Hubble parameter, H0 = 65+15-9 for ΩM = 1 and H0 = 7618-10, for ΩM = 0.3. Since the lensing galaxy lies very close to the center of the lensed ring, improving the error bars on H0 will require not only a more precise time delay measurement but also very precise astrometry of the whole system.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume514
Issue number2 PART 2
StatePublished - Apr 1 1999
Externally publishedYes

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time lag
radio
rings
astrometry
quasars
coverings
infrared spectra
lenses
galaxies
wavelength
radii
wavelengths
parameter

Keywords

  • Cosmology: observations
  • Gravitational lensing
  • Quasars: individual (PKS 1830-211)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Lidman, C., Courbin, F., Meylan, G., Broadhurst, T., Frye, B. L., & Welch, W. J. W. (1999). The redshift of the gravitationally lensed radio source PKS 1830-211. Astrophysical Journal, 514(2 PART 2).

The redshift of the gravitationally lensed radio source PKS 1830-211. / Lidman, C.; Courbin, F.; Meylan, G.; Broadhurst, T.; Frye, Brenda Louise; Welch, W. J W.

In: Astrophysical Journal, Vol. 514, No. 2 PART 2, 01.04.1999.

Research output: Contribution to journalArticle

Lidman, C, Courbin, F, Meylan, G, Broadhurst, T, Frye, BL & Welch, WJW 1999, 'The redshift of the gravitationally lensed radio source PKS 1830-211', Astrophysical Journal, vol. 514, no. 2 PART 2.
Lidman C, Courbin F, Meylan G, Broadhurst T, Frye BL, Welch WJW. The redshift of the gravitationally lensed radio source PKS 1830-211. Astrophysical Journal. 1999 Apr 1;514(2 PART 2).
Lidman, C. ; Courbin, F. ; Meylan, G. ; Broadhurst, T. ; Frye, Brenda Louise ; Welch, W. J W. / The redshift of the gravitationally lensed radio source PKS 1830-211. In: Astrophysical Journal. 1999 ; Vol. 514, No. 2 PART 2.
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