C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET22:23:10

2020A&A...641L...2M - Astronomy and Astrophysics, volume 641, L2-2 (2020/9-1)

All good things come in threes: the third image of the lensed quasar PKS 1830-211.


Abstract (from CDS):

Strong gravitational lensing distorts our view of sources at cosmological distances but brings invaluable constraints on the mass content of foreground objects and on the geometry and properties of the Universe. We report the detection of a third continuum source toward the strongly lensed quasar PKS 1830-211 in ALMA multi-frequency observations of high dynamic range and high angular resolution. This third source is point-like and located slightly to the north of the diagonal joining the two main lensed images, A and B, 0.3'' away from image B. It has a flux density that is ∼140 times weaker than images A and B and a similar spectral index, compatible with synchrotron emission. We conclude that this source is most likely the expected highly de-magnified third lensed image of the quasar. In addition, we detect, for the first time at millimeter wavelengths, weak and asymmetrical extensions departing from images A and B that correspond to the brightest regions of the Einstein ring seen at centimeter wavelengths. Their spectral index is steeper than that of compact images A, B, and C, which suggests that they arise from a different component of the quasar. Using the GravLens code, we explore the implications of our findings on the lensing model and propose a simple model that accurately reproduces our ALMA data and previous VLA observations. With a more precise and accurate measurement of the time delay between images A and B, the system PKS 1830-211 could help to constrain the Hubble constant to a precision of a few percent.

Abstract Copyright: © ESO 2020

Journal keyword(s): gravitational lensing: strong - quasars: individual: PKS 1830-211

VizieR on-line data: <Available at CDS (J/A+A/641/L2): list.dat fits/*>

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11831 0
2 QSO J1832-2039 BLL 18 32 11.0447839878 -20 39 48.202176867   18.56 20.2     ~ 40 1
3 QSO B1830-211B LeQ 18 33 39.822 -21 03 40.47           ~ 19 1
4 QSO B1830-211A LeQ 18 33 39.871 -21 03 39.78           ~ 19 1
5 QSO B1830-211 QSO 18 33 39.92 -21 03 39.9     18.70 21   ~ 556 6
6 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 704 0

    Equat.    Gal    SGal    Ecl

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