Gravitational Lens Mg
نویسندگان
چکیده
We report the discovery of a new gravitationally lensed radio source. Radio maps of MG 0751+2716 show four lensed images, which, at higher resolution, are resolved into long arcs of emission. A group of galaxies is present in optical images, including the principal lensing galaxy, with a much brighter galaxy just a few arcseconds away. We have measured the redshift of this brighter galaxy. No optical counterpart to the background source has been detected. Lens models that can readily reproduce the lensed image positions all require a substantial shear component. However, neither the very elongated lens nor the bright nearby galaxy are correctly positioned to explain the shear. Lens models which associate the mass with the light of galaxies in the group can produce an acceptable fit, but only with an extreme mass-to-light ratio in one of the minor group members.
منابع مشابه
/ 98 09 06 3 v 1 5 S ep 1 99 8 Redshifts of the Gravitational Lenses MG 0414 + 0534 and MG 0751 + 2716
We report redshifts in two gravitational lens systems, MG 0414+0534 and MG 0751+2716. The lens galaxy in MG 0414+0534 lies at zl = 0.9584± 0.0002. The luminosity and extreme red color of the lens are then typical of a passively evolving, early-type, ∼ 2L∗ galaxy. The galaxy cannot have a significant global mean extinction without being anomalously luminous. The lens galaxy in MG 0751+2716 has a...
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The redshifts of the gravitational lens galaxies in MG 1131+0456 and B 1938+666 are 0.844 and 0.878 respectively. Both are early-type galaxies lying at the redshifts predicted by assuming that they are early-type galaxies with old stellar populations lying on the fundamental plane. We also find evidence for a foreground group of galaxies at z = 0.343 near MG 1131+0456. The source redshifts are ...
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The four-image gravitational lens system MG 0414+0534 was observed with the GHz images reveal structure in the components which is consistent with that seen at other wavelengths. There was no detection of other extended emission, nor were there detections of the lensing galaxy or the " component x " seen in optical images. Detections of polarized emission show that the fractional polarized inte...
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Quadruple gravitational lens systems offer the possibility of measuring time delays for image pairs, microlensing effects, and extinction in distant galaxies. Observations of these systems may be used to obtain estimates of H0 and to study the various mass components of lens galaxies at high redshifts. With the Hubble Space Telescope, we have observed the reddest known gravitational lens system...
متن کامل15 GHz Monitoring of the Gravitational Lens MG 0414 + 0534
We report the results of monitoring the four images of the gravitational lens MG 0414+0534 at 15 GHz. In 35 VLA maps spanning 180 days, we measure root-mean-square variations in the image light curves of ∼3.5% mostly due to variations in the flux density calibration. The flux ratios, which are independent of flux density calibration variations, show root-mean-square variability of 1–3%. Extensi...
متن کاملar X iv : a st ro - p h / 97 08 07 9 v 1 8 A ug 1 99 7 15 GHz Monitoring of the Gravitational Lens MG 0414 + 0534
We report the results of monitoring the four images of the gravitational lens MG 0414+0534 at 15GHz. In 35 VLA maps spanning 180 days, we measure root-mean-square variations in the image light curves of ∼3.5% mostly due to variations in the flux density calibration. The flux ratios, which are independent of flux density calibration variations, show root-mean-square variability of 1–3%. Extensiv...
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