X-ray Radiation Mechanisms and the Beaming Effect of Hot Spots and Knots in AGN Jets

Jin Zhang; Jin Ming Bai; Liang Chen; Enwei Liang

doi:10.1007/s12036-011-9075-7

X-ray Radiation Mechanisms and the Beaming Effect of Hot Spots and Knots in AGN Jets

Jin Zhang^*, Jin Ming Bai, Liang Chen, Enwei Liang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The observed broadband spectral energy distributions (SEDs) of 22 hot spots and 45 knots are modelled with single-zone lepton models. Considering the sources at rest, the X-rays of some hot spots can be explained by the SSC model with magnetic field being consistent with the equipartition magnetic field in magnitude of order 1, but at the same time an unreasonably low magnetic field is required to model the X-rays for all knots. When considering the relativistic bulk motion of the sources, the IC/CMB model well explains the X-ray emission for most of them under the equipartition condition. We show that the ratio of observational luminosity R_L is tentatively correlated with the co-moving equipartition magnetic field B′_eq and the beaming factor δ. These facts suggest that the observational differences of the X-rays from the knots and hot spots may be mainly due to the differences in the Doppler boosting effect and the co-moving magnetic field of the two kinds of source.

Original language	English
Pages (from-to)	193-196
Number of pages	4
Journal	Journal of Astrophysics and Astronomy
Volume	32
Issue number	1
DOIs	https://doi.org/10.1007/s12036-011-9075-7
Publication status	Published - Jun 2011
Externally published	Yes

Keywords

Galaxies: jets
X-rays: galaxies
magnetic fields
radiation mechanisms non-thermal

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10.1007/s12036-011-9075-7

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title = "X-ray Radiation Mechanisms and the Beaming Effect of Hot Spots and Knots in AGN Jets",

abstract = "The observed broadband spectral energy distributions (SEDs) of 22 hot spots and 45 knots are modelled with single-zone lepton models. Considering the sources at rest, the X-rays of some hot spots can be explained by the SSC model with magnetic field being consistent with the equipartition magnetic field in magnitude of order 1, but at the same time an unreasonably low magnetic field is required to model the X-rays for all knots. When considering the relativistic bulk motion of the sources, the IC/CMB model well explains the X-ray emission for most of them under the equipartition condition. We show that the ratio of observational luminosity RL is tentatively correlated with the co-moving equipartition magnetic field B′eq and the beaming factor δ. These facts suggest that the observational differences of the X-rays from the knots and hot spots may be mainly due to the differences in the Doppler boosting effect and the co-moving magnetic field of the two kinds of source.",

keywords = "Galaxies: jets, X-rays: galaxies, magnetic fields, radiation mechanisms non-thermal",

author = "Jin Zhang and Bai, {Jin Ming} and Liang Chen and Enwei Liang",

year = "2011",

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doi = "10.1007/s12036-011-9075-7",

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T1 - X-ray Radiation Mechanisms and the Beaming Effect of Hot Spots and Knots in AGN Jets

AU - Zhang, Jin

AU - Bai, Jin Ming

AU - Chen, Liang

AU - Liang, Enwei

PY - 2011/6

Y1 - 2011/6

N2 - The observed broadband spectral energy distributions (SEDs) of 22 hot spots and 45 knots are modelled with single-zone lepton models. Considering the sources at rest, the X-rays of some hot spots can be explained by the SSC model with magnetic field being consistent with the equipartition magnetic field in magnitude of order 1, but at the same time an unreasonably low magnetic field is required to model the X-rays for all knots. When considering the relativistic bulk motion of the sources, the IC/CMB model well explains the X-ray emission for most of them under the equipartition condition. We show that the ratio of observational luminosity RL is tentatively correlated with the co-moving equipartition magnetic field B′eq and the beaming factor δ. These facts suggest that the observational differences of the X-rays from the knots and hot spots may be mainly due to the differences in the Doppler boosting effect and the co-moving magnetic field of the two kinds of source.

AB - The observed broadband spectral energy distributions (SEDs) of 22 hot spots and 45 knots are modelled with single-zone lepton models. Considering the sources at rest, the X-rays of some hot spots can be explained by the SSC model with magnetic field being consistent with the equipartition magnetic field in magnitude of order 1, but at the same time an unreasonably low magnetic field is required to model the X-rays for all knots. When considering the relativistic bulk motion of the sources, the IC/CMB model well explains the X-ray emission for most of them under the equipartition condition. We show that the ratio of observational luminosity RL is tentatively correlated with the co-moving equipartition magnetic field B′eq and the beaming factor δ. These facts suggest that the observational differences of the X-rays from the knots and hot spots may be mainly due to the differences in the Doppler boosting effect and the co-moving magnetic field of the two kinds of source.

KW - Galaxies: jets

KW - X-rays: galaxies

KW - magnetic fields

KW - radiation mechanisms non-thermal

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JO - Journal of Astrophysics and Astronomy

JF - Journal of Astrophysics and Astronomy

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ER -

X-ray Radiation Mechanisms and the Beaming Effect of Hot Spots and Knots in AGN Jets

Abstract

Keywords

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