EFFECT OF THE NONUNIFORMITY OF RADIO SOURCES ON ESTIMATES OF THEIR PHYSICAL PARAMETERS

被引：2

作者：

Artyukh, V. S. ^{[1
]}

Nedora, V. S. ^{[2
]}

机构：

[1] Russian Acad Sci, PN Lebedev Inst Phys, Moscow, Russia

[2] Rheinische Friedrich Wilhems Univ, Bonn, Germany

来源：

ASTROPHYSICS | 2017年 / 60卷 / 03期

关键词：

active galactic nuclei; radio jets; magnetic fields; RELATIVISTIC JETS; X-RAY;

D O I：

10.1007/s10511-017-9485-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Estimating the physical parameters of nonuniform radio sources in active galactic nuclei (AGN) requires knowledge of the angular dimensions of radio sources at the low frequencies where a steep slope (cutoff) in the low-frequency spectrum (opacity region) is observed. In most compact radio sources, the low-frequency cutoff lies in the meter wavelength range. At present there are no VLBI systems operating at meter wavelengths, so the low-frequency dimensions of compact radio sources in AGN cannot be measured directly. Here we propose a method for estimating the low-frequency angular dimensions of compact radio sources (in the opacity region) based on the shape of their spectra.

引用

页码：313 / 324

页数：12

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[31] The Apertif science verification campaign Characteristics of polarised radio sources [J].

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Berger, A. ;

Adams, E. A. K. ;

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de Blok, W. J. G. ;

Denes, H. ;

Moss, V. A. ;

Schulz, R. ;

van der Hulst, J. M. ;

Connor, L. ;

Damstra, S. ;

Hut, B. ;

Ivashina, M. V. ;

Loose, G. M. ;

Maan, Y. ;

Mika, A. ;

Mulder, H. ;

Norden, M. J. ;

Oostrum, L. C. ;

Orru, E. ;

Ruiter, M. ;

Smits, R. ;

van Cappellen, W. A. ;

van Leeuwen, J. ;

Vermaas, N. J. ;

Voh, D. ;

Ziemke, J. .

ASTRONOMY & ASTROPHYSICS, 2022, 663

[32] The environment of radio sources in the VLA-COSMOS survey field [J].

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Zucca, E. .

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Vazza, F. ;

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Cohen, Seth H. ;

Willmer, Christopher N. A. ;

Zhao, Xiurui ;

D'Silva, Jordan C. J. ;

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Summers, Jake ;

Windhorst, Rogier A. ;

Coe, Dan ;

Conselice, Christopher J. ;

Driver, Simon P. ;

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Grogin, Norman A. ;

Marshall, Madeline A. ;

Nonino, Mario ;

Ortiz, Rafael, III ;

Pirzkal, Nor ;

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Rutkowski, Michael J. ;

Ryan, Russell E., Jr. ;

Tompkins, Scott ;

Yan, Haojing ;

Hammel, Heidi B. ;

Milam, Stefanie N. ;

Adams, Nathan J. ;

Beacom, John F. ;

Bhatawdekar, Rachana ;

Cheng, Cheng ;

Civano, F. ;

Cotton, W. ;

Hyun, Minhee ;

Kikuta, Satoshi ;

Nyland, K. E. ;

Peters, W. M. ;

Petric, Andreea ;

Rottgering, Huub J. A. ;

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[36] The Impact of Polarized Extragalactic Radio Sources on the Detection of CMB Anisotropies in Polarization [J].

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Clarke, T. ;

Duncan, K. ;

Giacintucci, S. ;

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