Examples of extreme intraday variability |
| |
| Authors: | Lucyna Kedziora-Chudczer David L Jauncey Mark A Wieringa Anastasios K Tzioumis Hayley E Bignall |
| |
| Institution: | (1) Anglo-Australian Observatory, Australia;(2) Australia Telescope National Facility, Australia;(3) Australia Telescope National Facility, Australia;(4) Australia Telescope National Facility, Australia;(5) Australia Telescope National Facility, Australia;(6) University of Adelaide, Australia |
| |
| Abstract: | We present results of the ATCA IDV Survey of southern extragalactic radio sources. We discuss briefly the properties of the
22 new intraday variable sources discovered in the Survey. The follow-up observations of a few extreme examples of strong
intraday variability are presented. We find that the characteristics of the total flux density fluctuations at different wavelengths
are consistent with intersteller scintillations (ISS) of the microarcsecondsize soorten components. However, the scintillating
components of a few extreme IDVs are characterized by the brightness temperatures far exceeding the T
B=1012 K limit. The relativistic beaming invoked in such sources would require Doppler factors up to as high as δ∼ 103.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
