The ATCA intraday variability survey of extragalactic radio sources

被引：67

作者：

Kedziora-Chudczer, LL

Jauncey, DL

Wieringa, MH

Tzioumis, AK

Reynolds, JE

机构：

[1] CSIRO, Australian Telescope Natl Facil, Epping, NSW 1710, Australia

[2] Univ Sydney, Special Res Ctr Theoret Astrophys, Sydney, NSW 2006, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2001年 / 325卷 / 04期

关键词：

polarization; scattering; ISM : general; galaxies : active; galaxies : nuclei; radio continuum : galaxies;

D O I：

10.1046/j.1365-8711.2001.04516.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the results of an Australia Telescope Compact Array (ATCA) survey for intraday variability (IDV) of the total and polarized flux densities of 118 compact, flat-spectrum, extragalactic radio sources from the Parkes 2.7-GHz Survey. A total of 22 total flux density IDV sources were discovered and 15 sources were found to show IDV of their polarized flux density. We discuss the statistical properties of the IDV sources, including the distribution of source modulation indices, and the dependence of the variability amplitude on source spectral index and on Galactic position. We suggest interstellar scintillation (ISS) in the Galactic interstellar medium as the most likely mechanism for IDV. Even so, the inferred high brightness temperatures cannot be easily explained.

引用

页码：1411 / 1430

页数：20

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