MOJAVE. XIX. Brightness Temperatures and Intrinsic Properties of Blazar Jets

被引:53
作者
Homan, D. C. [1 ]
Cohen, M. H. [2 ]
Hovatta, T. [3 ,4 ]
Kellermann, K., I [5 ]
Kovalev, Y. Y. [6 ,7 ,8 ]
Lister, M. L. [9 ]
Popkov, A., V [6 ,7 ]
Pushkarev, A. B. [6 ,7 ,10 ]
Ros, E. [8 ]
Savolainen, T. [4 ,8 ,11 ]
机构
[1] Denison Univ, Dept Phys & Astron, Granville, OH 43023 USA
[2] CALTECH, Dept Astron, Pasadena, CA 91125 USA
[3] Univ Turku, Finnish Ctr Astron, ESO, FINCA, Turku, Finland
[4] Aalto Univ, Metsahovi Radio Observ, Metsahovintie 114, FI-02540 Kylmala, Finland
[5] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
[6] Russian Acad Sci, Lebedev Phys Inst, Leninsky Prospekt 53, Moscow 119991, Russia
[7] Moscow Inst Phys & Technol, Inst Sky Per 9, Dolgoprudnyi 141700, Moscow Region, Russia
[8] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[9] Purdue Univ, Dept Phys & Astron, 525 Northwestern Ave, W Lafayette, IN 47907 USA
[10] Crimean Astrophys Observ, Nauchny 298409, Crimea, Russia
[11] Aalto Univ, Dept Elect & Nanoengn, PL 15500, FI-00076 Aalto, Finland
基金
俄罗斯科学基金会; 俄罗斯基础研究基金会; 芬兰科学院;
关键词
ACTIVE GALACTIC NUCLEI; BL-LACERTAE OBJECTS; DIGITAL SKY SURVEY; TELESCOPE OPTICAL SPECTROSCOPY; SPECTRUM RADIO-SOURCES; EMISSION-LINE PROFILES; ENERGY GAMMA-RAYS; COMPLETE SAMPLE; DATA RELEASE; LAC OBJECTS;
D O I
10.3847/1538-4357/ac27af
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present multiepoch, parsec-scale core brightness temperature observations of 447 active galactic nucleus (AGN) jets from the MOJAVE and 2 cm Survey programs at 15 GHz from 1994 to 2019. The brightness temperature of each jet over time is characterized by its median value and variability. We find that the range of median brightness temperatures for AGN jets in our sample is much larger than the variations within individual jets, consistent with Doppler boosting being the primary difference between the brightness temperatures of jets in their median state. We combine the observed median brightness temperatures with apparent jet speed measurements to find the typical intrinsic Gaussian brightness temperature of 4.1( +/- 0.6) x 10(10) K, suggesting that jet cores are at or below equipartition between particle and magnetic field energy in their median state. We use this value to derive estimates for the Doppler factor for every source in our sample. For the 309 jets with both apparent speed and brightness temperature data, we estimate their Lorentz factors and viewing angles to the line of sight. Within the BL Lac optical class, we find that high-synchrotron-peaked BL Lacs have smaller Doppler factors, lower Lorentz factors, and larger angles to the line of sight than intermediate and low-synchrotron-peaked BL Lacs. We confirm that AGN jets with larger Doppler factors measured in their parsec-scale radio cores are more likely to be detected in gamma rays, and we find a strong correlation between gamma-ray luminosity and Doppler factor for the detected sources.
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页数:23
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