e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales
MetadataShow full item record
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2011 The Authors, © 2011Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
A recent detection of the peculiar neutron star X-ray binary Circinus X-1 with electronic very long baseline interferometry (e-VLBI) prompted the suggestion that compact, non-variable radio emission persists through the entire 16.6-d orbit of the binary system. We present the results of a high angular resolution monitoring campaign conducted with the Australian Long Baseline Array in real-time e-VLBI mode. e-VLBI observations of Circinus X-1 were made on alternate days over a period of 20 d covering the full binary orbit. A compact radio source associated with Circinus X-1 was clearly detected at orbital phases following periastron passage, but no compact radio emission was detected at any other orbital phase, ruling out the presence of a persistent, compact emitting region at our sensitivity levels. The jet was not resolved at any epoch of our 1.4-GHz monitoring campaign, suggesting that the ultrarelativistic flow previously inferred to exist in this source is likely to be dark. We discuss these findings within the context of previous radio monitoring of Circinus X-1.
Showing items related by title, author, creator and subject.
Rapid response monitoring of transient radio emission associated with gamma-ray bursts and circinus X-1Moin, Aquib (2011)This PhD project was aimed at carrying out comprehensive observational studies of radio sources associated with two types of transients: a) Gamma- Ray Bursts (GRBs) b) an X-ray binary system Circinus X-1, by exploring and ...
Tudose, V.; Fender, R.; Paragi, Z.; Garrett, M.; Rushton, A.; Spencer, R.; Miller-Jones, James (2010)e-VLBI (electronic very long baseline interferometry) is a new implementation of the VLBI technique consisting in transferring the data from the radio telescopes to the correlator over the internet and correlating them ...
Jones, S.; McHardy, I.; Moss, D.; Seymour, Nick; Breedt, E.; Uttley, P.; Körding, E.; Tudose, V. (2011)We present intensive quasi-simultaneous X-ray and radio monitoring of the narrow line Seyfert 1 galaxy NGC 4051, over a 16-month period in 2000–01. The X-ray observations were made with the Proportional Counter Array on ...