Discovery of a subparsec radio counterjet in the nucleus of Centaurus A

被引：46

作者：

Jones, DL

Tingay, SJ

Murphy, DW

Meier, DL

Jauncey, DL

Reynolds, JE

Tzioumis, AK

Preston, RA

McCulloch, PM

Costa, ME

Kemball, AJ

Nicolson, GD

Quick, JFH

King, EA

Lovell, JEJ

Clay, RW

Ferris, RH

Gough, RG

Sinclair, MW

Ellingsen, SP

Edwards, PG

Jones, PA

vanOmmen, TD

Harbison, P

Migenes, V

机构：

[1] AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WESTON,ACT 2611,AUSTRALIA

[2] CSIRO,AUSTRALIA TELESCOPE NATL FACIL,EPPING,NSW 2121,AUSTRALIA

[3] UNIV TASMANIA,HOBART,TAS 7001,AUSTRALIA

[4] HARTEBEESTHOEK RADIO ASTRON OBSERV,ZA-1740 KRUGERSDORP,TRANSVAAL,SOUTH AFRICA

[5] UNIV ADELAIDE,ADELAIDE,SA,AUSTRALIA

[6] INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN

[7] UNIV WESTERN SYDNEY,KINGSWOOD,NSW,AUSTRALIA

[8] UNIV TASMANIA,ANTARCT COOPERAT RES CTR,HOBART,TAS,AUSTRALIA

[9] BRITISH AEROSP AUSTRALIA,CANBERRA,ACT,AUSTRALIA

[10] NATL ASTRON OBSERV,MITAKA,TOKYO 181,JAPAN

来源：

ASTROPHYSICAL JOURNAL | 1996年 / 466卷 / 02期

关键词：

accretion; accretion disks; galaxies; active; individual; (NGC; 5128; Centaurus A); jets; nuclei;

D O I：

10.1086/310183

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A subparsec scale radio counterjet has been detected in the nucleus of the closest radio galaxy, Centaurus A (NGC 5128), with VLBI imaging at 2.3 and 8.4 GHz. This is one of the first detections of a VLBI counterjet and provides new constraints on the kinematics of the radio jets emerging from the nucleus of Cen A. A bright, compact core is seen at 8.4 GHz, along with a jet extending along P.A. 51 degrees. The core is completely absorbed at 2.3 GHz. Our images show a much wider gap between the base of the main jet and the counterjet at 2.3 GHz than at 8.4 GHz and also that the core has an extraordinarily inverted spectrum. These observations provide evidence that the innermost 0.4-0.8 pc of the source is seen through a disk or torus of ionized gas which is opaque at low frequencies due to free-free absorption.

引用

页码：L63 / L65

页数：3

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