Strong, variable circular polarization in PKS 1519-273

被引：67

作者：

Macquart, JP ^{[1
]}

Kedziora-Chudczer, L

Rayner, DP

Jauncey, DL

机构：

[1] Univ Sydney, Sch Phys, Special Res Ctr Theoret Astrophys, Sydney, NSW 2006, Australia

[2] CSIRO, Australia Telescope Natl Facil, Epping, NSW 2121, Australia

[3] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 538卷 / 02期

关键词：

BL Lacertae objects : individual (PKS 1519-273); polarization; radiation mechanisms : nonthermal; scattering;

D O I：

10.1086/309184

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report strong variability in the circular and linear polarization of the intraday variable source PKS 1519-273. The circular polarization varies on a timescale of hours to days at frequencies between 1.4 and 8.6 GHz, and is strongly correlated with variations in the total intensity at 4.8 and 8.6 GHz. We argue that the variability is due to interstellar scintillation of a highly compact (15-35 mu as) component of the source with -3.8% +/- 0.4% circular polarization at 4.8 GHz. We find that no simple model for the circular polarization can account for both the high magnitude and the frequency dependence in PKS 1519-273 at centimeter wavelengths.

引用

页码：623 / 627

页数：5

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