Radio-optical scrutiny of compact AGN: Correlations between properties of pc-scale jets and optical nuclear emission
Radio-optical scrutiny of compact AGN: Correlations between properties of pc-scale jets and optical nuclear emission
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紧凑 AGN 的射电光学检查：PC 级射流特性与光学核发射之间的相关性
DOI：
10.1051/0004-6361/201014418
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Chavushyan
中科院分区：
文献类型：
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作者：
Arshakian;Torrealba;Chavushyan
目的研究135个致密喷流的VLBA（Very Long Baseline Array，甚长基线阵）15 GHz射电辐射、151 MHz扩展辐射和5100 μ m光学核辐射之间的相关性 。方法利用偏Kendall τ相关分析检验秒差距尺度喷流的射电性质与宿主活动星系核（AGN）光学核光度之间的联系。结果发现99个类星体在15 GHz的毫角秒尺度下，光学核光度与总射电（VLBA）光度之间存在显著的正相关关系。对于18 BL拉克，光学连续辐射与15 GHz的喷流的射电辐射相关。我们认为，射电和光辐射是成束的，起源于类星体亚秒差距尺度喷流的最内部。对喷流视速度与5100 nm处光学核光度之间关系的分析支持了喷流中光学辐射的相对论性聚束模型，并估计了类星体（2× 1020 W Hz-1，γ= 52）、BL拉克（9× 1021 W Hz-1，γ= 20）和射电星系（1.5× 1021 W Hz-1，γ= 9）的喷流内禀光学光度峰值及其洛伦兹因子。 发现类星体的射电响度（15 GHz通量密度与5100 nm处光学核通量的比值）在高红移处增加，这被解释为射电区的多普勒因子逐渐高于光学区。一个很强的正相关性被发现之间的内在动力学功率的射流（从在151 MHz的通量密度测量）和总的表观光度和未解决的核心发射的射流在15 GHz。这种相关性被解释为一个本质上更明亮的秒差距尺度的喷流产生更明亮的扩展结构，这是在低无线电频率，151兆赫检测。低频无线电发射在超光速源中相对论性地发射，因此与15 GHz喷流的无线电光度相关的可能性不能被排除。需要在很宽的频率范围内监测超光速活动星系核，以检查每种效应的贡献。
AimsWe study the correlations between the VLBA (Very Long Baseline Array) radio emission at 15 GHz, extended emission at 151 MHz, and optical nuclear emission at 5100 Å for a complete sample of 135 compact jets.MethodsWe use the partial Kendall's tau correlation analysis to check the link between radio properties of parsec-scale jets and optical nuclear luminosities of host active galactic nuclei (AGN).ResultsWe find a significant positive correlation for 99 quasars between optical nuclear luminosities and total radio (VLBA) luminosities of unresolved cores at 15 GHz originated at milliarcseconds scales. For 18 BL Lacs, the optical continuum emission correlates with the radio emission of the jet at 15 GHz. We suggest that the radio and optical emission are beamed and originate in the innermost part of the sub-parsec-scale jet in quasars. Analysis of the relation between the apparent speed of the jet and the optical nuclear luminosity at 5100 Å supports the relativistic beaming model for the optical emission generated in the jet, and allows the peak values of the intrinsic optical luminosity of the jet and its Lorentz factor to be estimated for the populations of quasars (2×1020W Hz-1andγ= 52), BL Lacs (9×1021W Hz-1andγ= 20), and radio galaxies (1.5×1021W Hz-1andγ= 9). The radio-loudness of quasars (the ratio of 15 GHz flux density and optical nuclear flux at 5100 Å) is found to increase at high redshifts, which is interpreted as progressively higher Doppler factors in radio regime compared to those in optical. A strong positive correlation is found between the intrinsic kinetic power of the jet (measured from the flux density at 151 MHz) and the apparent luminosities of the total and the unresolved core emission of the jet at 15 GHz. This correlation is interpreted in terms of an intrinsically more luminous parsec-scale jet producing more luminous extended structure, which is detectable at low radio frequencies, 151 MHz. A possibility that the low frequency radio emission is relativistically beamed in superluminal sources and therefore correlates with radio luminosity of the jet at 15 GHz cannot be ruled out. Monitoring of superluminal AGN in a wide range of frequencies is required to check the contribution of each effect.
帕洛马巡天中选定视场的超视距光电序列和星等直径关系
DOI：
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发表时间：
1991
期刊：
影响因子：
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作者：
R. Humphreys;Robert Landau;F. Ghigo;W. Zumach;A. E. Labonte
通讯作者：
A. E. Labonte
帕洛马天文台巡天的自动平板扫描仪目录。
DOI：
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发表时间：
2003
期刊：
影响因子：
--
作者：
J. E. Cabanela;R. Humphreys;G. Aldering;J. Larsen;S. Odewahn;P. Thurmes;C. S. Cornuelle
通讯作者：
C. S. Cornuelle
附近 3CRR 射电星系中的射电核、光学核和 X 射线核
DOI：
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发表时间：
1999
期刊：
影响因子：
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作者：
M. Hardcastle;D. M. Worrall
通讯作者：
D. M. Worrall