Multi-frequency VLBI observations of the GPS source 1934-638

被引：0

作者：

Tzioumis, AK ^{[1
]}

King, EA ^{[1
]}

Reynolds, JE ^{[1
]}

Jauncey, DL ^{[1
]}

Gough, RG ^{[1
]}

Preston, RA ^{[1
]}

Murphy, DW ^{[1
]}

Tingay, SJ ^{[1
]}

Meier, DL ^{[1
]}

Jones, DL ^{[1
]}

Lovell, JEJ ^{[1
]}

Edwards, PG ^{[1
]}

McCulloch, PM ^{[1
]}

Costa, ME ^{[1
]}

Kedziora-Chudczer, L ^{[1
]}

Campbell-Wilson, D ^{[1
]}

Nicolson, GD ^{[1
]}

Quick, JFH ^{[1
]}

机构：

[1] Australia Telescope Natl Facil, Epping, NSW 2121, Australia

来源：

RADIO EMISSION FROM GALACTIC AND EXTRAGALACTIC COMPACT SOURCES | 1998年 / 144卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

PKS1934-638 is an archetypal GPS source, peaking at 1.4 GHz and exhibits almost no flux density variability. VLBI images at frequencies of .843, 2.3, 4.8, & 8.4 were made with the southern hemisphere VLBI array and they reveal that the source is a 42 mas compact double. There is no detectable change in separation over the last 20 years, yielding an upper limit of similar to 0.03c +/- 0.2c on any expansion velocity. The spectral shapes of the two components are remarkably similar, despite indications of finer structure on longer baselines. Magnetic field calculations indicate fields of a few mGauss and the results are consistent with equipartition.

引用

页码：179 / 180

页数：2

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