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Examining the High-energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets
Zhang, J; Du, SS; Guo, SC; Zhang, HM; Chen, L; Liang, EW; Zhang, SN; Zhang SN(张双南)
2018
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
EISSN1538-4357
Volume858Issue:1Pages:27
SubtypeArticle
AbstractWe compile the radio-optical-X-ray spectral energy distributions (SEDs) of 65 knots and 29 hotspots in 41 active galactic nucleus jets to examine their high-energy radiation mechanisms. Their SEDs can be fitted with the single-zone leptonic models, except for the hotspot of Pictor A and six knots of 3C 273. The X-ray emission of 1 hotspot and 22 knots is well explained as synchrotron radiation under the equipartition condition; they usually have lower X-ray and radio luminosities than the others, which may be due to a lower beaming factor. An inverse Compton (IC) process is involved for explaining the X-ray emission of the other SEDs. Without considering the equipartition condition, their X-ray emission can be attributed to the synchrotron-self-Compton process, but the derived jet powers (P-jet) are not correlated with L-k and most of them are larger than L-k, with more than three orders of magnitude, where L-k is the jet kinetic power estimated with their radio emission. Under the equipartition condition, the X-ray emission is well interpreted with the IC process for the cosmic microwave background photons (IC/CMB). In this scenario, the derived P-jet of knots and hotspots are correlated with and comparable to L-k. These results suggest that the IC/CMB model may be a promising interpretation of the X-ray emission. In addition, a tentative knot-hotspot sequence in the synchrotron peak-energy-peak-luminosity plane is observed, similar to the blazar sequence, which may be attributed to the different cooling mechanisms of electrons.
Keywordgalaxies: active galaxies: jets radiation mechanisms: non-thermal X-rays: galaxies
DOI10.3847/1538-4357/aab9b2
WOS KeywordX-RAY-EMISSION ; HUBBLE-SPACE-TELESCOPE ; II RADIO-SOURCES ; HOT-SPOTS ; PARTICLE-ACCELERATION ; CHANDRA DETECTION ; DEEP CHANDRA ; M87 JET ; GALAXY ; BLAZARS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000431142400006
ADS Bibcode2018ApJ...858...27Z
AXRIV CODE1803
inspireid1664011
Citation statistics
Cited Times:6 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285880
Collection粒子天体物理中心
理论物理室
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Zhang, J,Du, SS,Guo, SC,et al. Examining the High-energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets[J]. ASTROPHYSICAL JOURNAL,2018,858(1):27.
APA Zhang, J.,Du, SS.,Guo, SC.,Zhang, HM.,Chen, L.,...&张双南.(2018).Examining the High-energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets.ASTROPHYSICAL JOURNAL,858(1),27.
MLA Zhang, J,et al."Examining the High-energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets".ASTROPHYSICAL JOURNAL 858.1(2018):27.
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