High-resolution imaging from Mauna Kea: the triple quasar in 0.3-arc s seeing

  title={High-resolution imaging from Mauna Kea: the triple quasar in 0.3-arc s seeing},
  author={J. Patrick Henry and James N. Heasley},
The ‘triple’ quasar, PG1115 +08 (which actually contains at least four objects: A1, A2, B and C) was the second gravitational lens object to be found1. But because of its small angular scale (<2.5 arc s separation between components) and lack of detectable radio emission, which precludes the use of high-resolution interferometric radio techniques, not much is known about this object. In particular, the lensing object(s) have not been identified. Here we report imaging observations made on a… 
The Quadruple Gravitational Lens PG 1115+080: Time Delays and Models
Optical photometry is presented for the quadruple gravitational lens PG 1115+080. A preliminary reduction of data taken from 1995 November to 1996 June gives component C leading component B by 23.7 ±
Gravitational microlensing is a powerful tool for probing the physical properties of quasar accretion disks and properties of the lens galaxy such as its dark matter fraction and mean stellar mass.
The X-Ray Properties of Moderate-Redshift Galaxy Groups Selected by Association with Gravitational Lenses
We present results from a systematic investigation of the X-ray properties of a sample of moderate-redshift (0.3 < z < 0.6) galaxy groups. These groups were selected not by traditional X-ray or
An Infrared Einstein Ring in the Gravitational Lens PG 1115+080*
Hubble Space Telescope observations of the gravitational lens PG 1115+080 in the infrared show the known zl = 0.310 lens galaxy and reveal the zs = 1.722 quasar host galaxy. The main lens galaxy G is
PG 1115+080: variations of the A2/A1 flux ratio and new values of the time delays
We report the results of our multicolor observations of PG 1115+080 with the 1.5-m telescope of the Maidanak Observatory (Uzbekistan, Central Asia) in 2001-2006. Monitoring data in filter R spanning
A SHARP view of H0LiCOW: H0 from three time-delay gravitational lens systems with adaptive optics imaging
We present the measurement of the Hubble constant, H0, with three strong gravitational lens systems. We describe a blind analysis of both PG 1115+080 and HE 0435−1223 as well as an extension of our
Gravitational Lenses as Tools in Observational Cosmology
The study of gravitational lenses is intimately tied to observational cosmology. When we observe a gravitationally lensed quasar, we are viewing a single object along two or more neighboring paths
A Spectroscopic Study of the Environments of Gravitational Lens Galaxies
We present the first results from our spectroscopic survey of strong gravitational lens environments. Six of the eight lens galaxies in our sample belong to a poor group of galaxies, three of which
Determining the Hubble constant from the gravitational lens PG-1115+080
For the quadruple gravitational lens PG 1115+080, we combine recent measurements of the time delays with new lens models to determine the Hubble constant H0. We explore the effects of systematic
Determining the time delays in the gravitational lens PG 1115+080
A statistical analysis of published long-term photometric monitoring observations of the gravitationally lensed quasar PG 1115+080 in the optical is presented. This goal of this study is determining


The triple quasar Q1115+080A, B, C - A quintuple gravitational lens image
Spectroscopy and direct imaging of Qll 15+080A,B,C with a CCD camera supports the hypothesis that they are gravitational images of a single object. Spectroscopy of the C III] λ1909 emission line
Morphology of the triple QSO PG1115 + 08
Weymann et al.1 have reported that two faint unresolved objects located within 3arcs of the QSO PG1115 + 08 have also the same spectra. The emission lines of C III λl,909 and C IV λ1,549 at a
Spheroidal gravitational lenses and the triple quasar
A model for the triple quasar Q1115+080 A, B, C based on a single gravitational lens is proposed. It is demonstrated that the resulting five-image configuration produced by a lens galaxy having a
THE PROFILE OF A STAR IMAGE IVAN R. KING Berkeley Astronomy Department, University of California Received 25 January 1971 Various data are assembled to construct the profile of a star image, from its
The triple QSO PG1115 + 08: another probable gravitational lens
Recently, Walsh, Carswell and Weymann1 reported the discovery of two objects (0957+56A,B) with identical spectra and separated by 6 arc min. They suggested that a gravitational lens was responsible.
Numerical restoration of astronomical images
The two iterative deconvolution algorithms are examined in the context of restoring optical images for the effects of seeing. Both algorithms are easy to program, computationally efficient, and are