The IR spectrum of the double QSO

M. J. Lebofsky; G. H. Rieke; D. Walsh; R. J. Weymann

doi:10.1038/285385a0

The IR spectrum of the double QSO

M. J. Lebofsky, G. H. Rieke, D. Walsh, R. J. Weymann

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Abstract

The hypothesis that the double QSO, 0957 + 561A,B (separation 6 arcs s and z = 1.4) is formed by a gravitational lens¹ has found strong support from observations² suggesting the presence of an intervening giant elliptical galaxy with z ≃ 0.4, separated from component B by <1 arc s. According to the lens hypothesis the flux ratio of the two QSOs should be the same at all wavelengths. Any difference observed should be due only to superposition on component B of emission from the lens galaxy, which is expected to be predominantly in the IR. We report here new photometry at 1.25, 1.6 and 2.2 μm which strengthens the case for lens action and confirms that the lens galaxy is a giant elliptical.

Original language	English (US)
Pages (from-to)	385-386
Number of pages	2
Journal	Nature
Volume	285
Issue number	5764
DOIs	https://doi.org/10.1038/285385a0
State	Published - 1980

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title = "The IR spectrum of the double QSO",

abstract = "The hypothesis that the double QSO, 0957 + 561A,B (separation 6 arcs s and z = 1.4) is formed by a gravitational lens1 has found strong support from observations2 suggesting the presence of an intervening giant elliptical galaxy with z ≃ 0.4, separated from component B by <1 arc s. According to the lens hypothesis the flux ratio of the two QSOs should be the same at all wavelengths. Any difference observed should be due only to superposition on component B of emission from the lens galaxy, which is expected to be predominantly in the IR. We report here new photometry at 1.25, 1.6 and 2.2 μm which strengthens the case for lens action and confirms that the lens galaxy is a giant elliptical.",

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year = "1980",

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AU - Lebofsky, M. J.

AU - Rieke, G. H.

AU - Walsh, D.

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N2 - The hypothesis that the double QSO, 0957 + 561A,B (separation 6 arcs s and z = 1.4) is formed by a gravitational lens1 has found strong support from observations2 suggesting the presence of an intervening giant elliptical galaxy with z ≃ 0.4, separated from component B by <1 arc s. According to the lens hypothesis the flux ratio of the two QSOs should be the same at all wavelengths. Any difference observed should be due only to superposition on component B of emission from the lens galaxy, which is expected to be predominantly in the IR. We report here new photometry at 1.25, 1.6 and 2.2 μm which strengthens the case for lens action and confirms that the lens galaxy is a giant elliptical.

AB - The hypothesis that the double QSO, 0957 + 561A,B (separation 6 arcs s and z = 1.4) is formed by a gravitational lens1 has found strong support from observations2 suggesting the presence of an intervening giant elliptical galaxy with z ≃ 0.4, separated from component B by <1 arc s. According to the lens hypothesis the flux ratio of the two QSOs should be the same at all wavelengths. Any difference observed should be due only to superposition on component B of emission from the lens galaxy, which is expected to be predominantly in the IR. We report here new photometry at 1.25, 1.6 and 2.2 μm which strengthens the case for lens action and confirms that the lens galaxy is a giant elliptical.

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The IR spectrum of the double QSO

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