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The 3CR $Chandra$ extragalactic survey at 1.0$<z<$1.5
High Energy Astrophysical Phenomena · Submitted 28 Jun 2018
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim All radio sources have an X-ray counterpart.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
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The abstract, sentence by sentence
The aim of this paper is to present an analysis of newly acquired X-ray observations of 16 extragalactic radio sources, listed in the Third Cambridge Revised (3CR) catalog, and not previously observed by Chandra. Observations were performed during Chandra Cycle 17, extending X-ray coverage for the 3CR extragalactic catalog up to $z$=1.5. Among the 16 targets, two lie at $z<$0.5 (i.e., 3CR27, at $z$=0.184 and 3CR69, at $z$=0.458), all the remaining 14 have redshifts between 1.0 and 1.5. In the current sample there are three compact steep spectrum (CSS) sources, three quasars and an FRI radio galaxy, while the other nine are FRII radio galaxies. All radio sources have an X-ray counterpart. We measured nuclear X-ray fluxes as well as X-ray emission associated with radio jet knots, hotspots or lobes in three energy bands: soft (0.5-1 keV), medium (1-2 keV) and hard (2-7 keV). We also performed standard X-ray spectral analysis for the four brightest nuclei. We discovered X-ray emission associated with: the radio lobe of 3CR124; a hotspot of the quasar 3CR220.2; another hotspot of the radio galaxy 3CR238; and the jet knot of 3CR297. We also detected extended X-ray emission around the nuclear region of 3CR124 and 3CR297 on scales of several tens of kpc. Finally, we present an update on the X-ray observations performed with Chandra and XMM-Newton on the entire 3CR extragalactic catalog.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The aim of this paper is to present an analysis of newly acquired X-ray observations of 16 extragalactic radio sources, listed in the Third Cambridge Revised (3CR) catalog, and not previously observed by Chandra. | contribution 1.00 | 0.58 | 0.04 | asserted 0.94 |
| s1 | Observations were performed during Chandra Cycle 17, extending X-ray coverage for the 3CR extragalactic catalog up to $z$=1.5. | method 0.68 | 0.86 | 0.04 | asserted 1.00 |
| s2 | Among the 16 targets, two lie at $z<$0.5 (i.e., 3CR27, at $z$=0.184 and 3CR69, at $z$=0.458), all the remaining 14 have redshifts between 1.0 and 1.5. | contribution 0.67 | 0.46 | 0.03 | asserted 1.00 |
| s3 | In the current sample there are three compact steep spectrum (CSS) sources, three quasars and an FRI radio galaxy, while the other nine are FRII radio galaxies. | contribution 0.73 | 0.49 | 0.04 | asserted 1.00 |
| s4 | All radio sources have an X-ray counterpart. | result 1.00 | 0.81 | 0.14 | asserted 1.00 |
| s5 | We measured nuclear X-ray fluxes as well as X-ray emission associated with radio jet knots, hotspots or lobes in three energy bands: soft (0.5-1 keV), medium (1-2 keV) and hard (2-7 keV). | method 0.96 | 0.98 | 0.04 | asserted 1.00 |
| s6 | We also performed standard X-ray spectral analysis for the four brightest nuclei. | method 0.97 | 0.97 | 0.02 | asserted 1.00 |
| s7 | We discovered X-ray emission associated with: the radio lobe of 3CR124; a hotspot of the quasar 3CR220.2; another hotspot of the radio galaxy 3CR238; and the jet knot of 3CR297. | result 1.00 | 0.97 | 0.19 | asserted 1.00 |
| s8 | We also detected extended X-ray emission around the nuclear region of 3CR124 and 3CR297 on scales of several tens of kpc. | result 1.00 | 0.96 | 0.06 | asserted 1.00 |
| s9 | Finally, we present an update on the X-ray observations performed with Chandra and XMM-Newton on the entire 3CR extragalactic catalog. | contribution 0.95 | 0.73 | 0.06 | asserted 0.97 |
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The paper
Original abstract
The aim of this paper is to present an analysis of newly acquired X-ray observations of 16 extragalactic radio sources, listed in the Third Cambridge Revised (3CR) catalog, and not previously observed by Chandra. Observations were performed during Chandra Cycle 17, extending X-ray coverage for the 3CR extragalactic catalog up to $z$=1.5. Among the 16 targets, two lie at $z<$0.5 (i.e., 3CR27, at $z$=0.184 and 3CR69, at $z$=0.458), all the remaining 14 have redshifts between 1.0 and 1.5. In the current sample there are three compact steep spectrum (CSS) sources, three quasars and an FRI radio galaxy, while the other nine are FRII radio galaxies. All radio sources have an X-ray counterpart. We measured nuclear X-ray fluxes as well as X-ray emission associated with radio jet knots, hotspots or lobes in three energy bands: soft (0.5-1 keV), medium (1-2 keV) and hard (2-7 keV). We also performed standard X-ray spectral analysis for the four brightest nuclei. We discovered X-ray emission associated with: the radio lobe of 3CR124; a hotspot of the quasar 3CR220.2; another hotspot of the radio galaxy 3CR238; and the jet knot of 3CR297. We also detected extended X-ray emission around the nuclear region of 3CR124 and 3CR297 on scales of several tens of kpc. Finally, we present an update on the X-ray observations performed with Chandra and XMM-Newton on the entire 3CR extragalactic catalog.
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