The redshift of the gravitationally lensed radio source PKS1830-211

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 NE component of the doubly imaged core is identified, in our infrared spectrum covering the wavelength range 1.5-2.5 microns, as an impressively reddened quasar at z=2.507. Our redshift measurement, together with the recently measured time delay (Lovell et al.), means that we are a step closer to determining the Hubble constant from this lens. Converting the time delay into the Hubble constant by using existing models leads to high values for the Hubble constant. Since the lensing galaxy lies very close to the center of the lensed ring, improving the error bars on the Hubble constant will require not only a more precise time delay measurement, but also very precise astrometry of the whole system.

arXiv comment11 pages, 2 figures, Accepted ApJL

References in corpus (5)

• Determining the Hubble Constant from the Gravitational Lens PG 1115+080
• The complex molecular absorption line system at z=0.886 towards PKS1830-211
• PKS 1830-211: A Possible Compound Gravitational Lens
• Image Deconvolution of the Radio Ring PKS 1830-211
• Near-Infrared Spectroscopy of the High Redshift Quasar S4 0636+68 at z=3.2

Cited by in corpus (58)

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• BASS XXII: The BASS DR2 AGN Catalog and Data
• The Microlensing Properties of a Sample of 87 Lensed Quasars
• A precise and accurate determination of the cosmic microwave background temperature at z=0.89
• The density, the cosmic microwave background, and the proton-to-electron mass ratio in a cloud at redshift 0.9
• A determination of H_0 with the CLASS gravitational lens B1608+656: II. Mass models and the Hubble constant from lensing
• Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
• PKS 1830-211: A Face-On Spiral Galaxy Lens
• Probing isotopic ratios at z = 0.89: molecular line absorption in front of the quasar PKS 1830-211
• Improved Constraints on the Gravitational Lens Q0957+561. II. Strong Lensing
• A strong magnetic field in the jet base of a supermassive black hole
• BAT AGN Spectroscopic Survey XXI: The Data Release 2 Overview
• A comprehensive power spectral density analysis of astronomical time series I: the Fermi-LAT gamma-ray light curves of selected blazars
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• Gamma-ray flaring activity from the gravitationally lensed blazar PKS 1830-211 observed by Fermi LAT
• The Hubble constant inferred from 18 time-delay lenses
• Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211
• XMM-Newton observations of a sample of gamma-ray loud active galactic nuclei
• The Distribution of Redshifts in New Samples of Quasi-stellar Objects
• First evidence for a gravitational lensing-induced echo in gamma rays with Fermi LAT
• Cosmic alignment towards the radio Einstein ring PKS 1830-211 ?
• Probing the jet base of the blazar PKS1830-211 from the chromatic variability of its lensed images. Serendipitous ALMA observations of a strong gamma-ray flare
• Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars
• Changes in the measured image separation of the gravitational lens system, PKS 1830-211
• Helical Jet in the Gravitationally Lensed Blazar PKS1830-211
• Submillimeter water and ammonia absorption by the peculiar z~0.89 interstellar medium in the gravitational lens of the PKS 1830-211 system
• First cosmological constraints on the proton-to-electron mass ratio from observations of rotational transitions of methanol
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• Probing The Dust-To-Gas Ratio of z > 0 Galaxies Through Gravitational Lenses
• The remarkable gamma-ray activity in the gravitationally lensed blazar PKS 1830-211
• New molecular species at redshift z=0.89
• Detection of CH+, SH+, and their 13C- and 34S- isotopologues toward PKS1830-211
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• Resolving the High Energy Universe with Strong Gravitational Lensing: The Case of PKS 1830-211
• A study of submillimeter methanol absorption toward PKS1830-211: Excitation, invariance of the proton-electron mass ratio, and systematics
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• All good things come in threes: the third image of the lensed quasar PKS1830-211
• The inhomogeneous ISM toward PKS1830-211 SW - A detailed view on molecular gas at a look-back time of 7.5 Gyr
• The Search for Extragalactic Lithium Hydride
• Confirmation of two extended objects along the line of sight to PKS1830-211 with ESO-VLT adaptive optics imaging
• Submillimeter polarization and variability of quasar PKS 1830-211
• Detection of CI in absorption towards PKS 1830-211 with the eSMA
• Spatially Resolved Millimeter Spectroscopy of the Gravitational Lens PKS 1830-211
• Cosmo-tomography toward PKS1830-211: Variability of the quasar and of its foreground molecular absorption monitored with ALMA
• Variable X-ray Absorption toward Gravitationally-Lensed Blazar PKS1830-211
• Strongly Lensed Jets, Time Delays, and the Value of H0
• On Measuring the CMB Temperature at Redshift 0.89
• Microlensing induced absorption line variability
• H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830-211
• Methanol absorption in PKS B1830-211 at milliarcsecond scales
• Study of Temporal and Spectral variability for Blazar PKS 1830-211 with Multi-Wavelength Data
• Discovery of Hydrogen Radio Recombination Lines at z=0.89 towards PKS 1830-211
• A new constraint on the molecular oxygen abundance at $z\sim 0.886$
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• An improved time delay from VLA and ATCA monitoring of the gravitational lens system PKS 1830-211