The faintest radio source yet: Expanded very large array observations of the gravitational lens SDSS J1004+4112

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Abstract

We present new radio observations of the large-separation gravitationally lensed quasar SDSS J1004+4112, taken in a total of 6 hr of observations with the Expanded Very Large Array. The maps reach a thermal noise level of approximately 4 μJy. We detect four of the five lensed images at the 15-35 μJy level, representing a source of intrinsic flux density, after allowing for lensing magnification, of about 1 μJy, intrinsically probably the faintest radio source yet detected. This reinforces the utility of gravitational lensing in potentially allowing us to study nJy-level sources before the advent of the Square Kilometre Array. In an optical observation taken three months after the radio observation, image C is the brightest image, whereas the radio map shows flux density ratios consistent with previous optical observations. Future observations separated by a time delay will give the intrinsic flux ratios of the images in this source. © 2011. The American Astronomical Society. All rights reserved.

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Jackson, N. (2011). The faintest radio source yet: Expanded very large array observations of the gravitational lens SDSS J1004+4112. Astrophysical Journal Letters, 739(1). https://doi.org/10.1088/2041-8205/739/1/L28

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