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The Intergalactic Medium and the Energy Distribution of Quasars
Astrophysics · Submitted 8 May 2002
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Therefore, our interpretation in its present form cannot be sustained.
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The abstract, sentence by sentence
The ionizing spectral energy distribution of quasars is known to exhibit a steepening of the distribution short-ward of 1050\AA. It has been assumed that this change of power-law index from -1 to -2 is intrinsic to the quasars. We study an alternative interpretation, in which a tenuous absorption screen is responsible for the change of index. A successful spectral fit is obtained using a total hydrogen density distribution decreasing with redshift as $\sim (1+z)^{\xi}$ with $\xi$ of the order -3.5 if we suppose that the ionization state of the intervening gas is controlled by the line-of-sight quasar. This interpretation is not compatible, however, with the relative weakness of the observed quasar intensities with respect to that of the local background metagalactic radiation. Therefore, our interpretation in its present form cannot be sustained.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The ionizing spectral energy distribution of quasars is known to exhibit a steepening of the distribution short-ward of 1050\AA. | background 1.00 | 0.05 | 0.02 | asserted 1.00 |
| s1 | It has been assumed that this change of power-law index from -1 to -2 is intrinsic to the quasars. | background 1.00 | 0.04 | 0.03 | asserted 0.81 |
| s2 | We study an alternative interpretation, in which a tenuous absorption screen is responsible for the change of index. | contribution 0.92 | 0.31 | 0.05 | hedged possibility 0.39 |
| s3 | A successful spectral fit is obtained using a total hydrogen density distribution decreasing with redshift as $\sim (1+z)^{\xi}$ with $\xi$ of the order -3.5 if we suppose that the ionization state of the intervening gas is controlled by the line-of-sight quasar. | result 0.88 | 0.86 | 0.06 | asserted 0.68 |
| s4 | This interpretation is not compatible, however, with the relative weakness of the observed quasar intensities with respect to that of the local background metagalactic radiation. | limitation 0.86 | 0.46 | 0.14 | asserted 1.00 |
| s5 | Therefore, our interpretation in its present form cannot be sustained. | limitation 0.80 | 0.76 | 0.84 | asserted 1.00 |
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The paper
Original abstract
The ionizing spectral energy distribution of quasars is known to exhibit a steepening of the distribution short-ward of 1050\AA. It has been assumed that this change of power-law index from -1 to -2 is intrinsic to the quasars. We study an alternative interpretation, in which a tenuous absorption screen is responsible for the change of index. A successful spectral fit is obtained using a total hydrogen density distribution decreasing with redshift as $\sim (1+z)^{\xi}$ with $\xi$ of the order -3.5 if we suppose that the ionization state of the intervening gas is controlled by the line-of-sight quasar. This interpretation is not compatible, however, with the relative weakness of the observed quasar intensities with respect to that of the local background metagalactic radiation. Therefore, our interpretation in its present form cannot be sustained.
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