A return to strong radio flaring by Circinus X-1 observed with the Karoo Array Telescope test array KAT-7
A return to strong radio flaring by Circinus X-1 observed with the Karoo Array Telescope test array KAT-7
复制标题
卡鲁阵列望远镜测试阵列 KAT-7 观察到圆规座 X-1 恢复强烈射电耀斑
DOI:
10.1093/mnras/stt860
复制
发表时间:
2013
影响因子:
4.8
通讯作者:
Armstrong R
中科院分区:
文献类型:
--
作者:
Armstrong R
Circinus X-1 is a bright and highly variable X-ray binary which displays strong and rapid evolution in all wavebands. Radio flaring, associated with the production of a relativistic jet, occurs periodically on a ∼17-d time-scale. A longer term envelope modulates the peak radio fluxes in flares, ranging from peaks in excess of a Jansky in the 1970s to a historic low of milliJanskys during the years 1994–2006. Here, we report first observations of this source with the MeerKAT (Karoo Array Telescope) test array, KAT-7, part of the pathfinder development for the African dish component of the Square Kilometre Array, demonstrating successful scientific operation for variable and transient sources with the test array. The KAT-7 observations at 1.9 GHz during the period 2011 December 13 to 2012 January 16 reveal in temporal detail the return to the Jansky-level events observed in the 1970s. We compare these data to contemporaneous single-dish measurements at 4.8 and 8.5 GHz with the HartRAO 26-m telescope and X-ray monitoring from MAXI. We discuss whether the overall modulation and recent dramatic brightening is likely to be due to an increase in the power of the jet due to changes in accretion rate or changing Doppler boosting associated with a varying angle to the line of sight.
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DOI:
10.1111/j.1365-2966.2006.10873.x
发表时间:
2006
影响因子:
4.8
作者:
V. Tudose;R. Fender;C. Kaiser;A. Tzioumis;M. Klis;R. Amsterdam;Bucharest;Southampton;Atnf;Manchester
通讯作者:
Manchester
DOI:
10.1111/j.1365-2966.2011.18660.x
发表时间:
2011
影响因子:
4.8
作者:
A. Moin;C. Reynolds;J. Miller;S. Tingay;C. Phillips;A. Tzioumis;G. Nicolson;R. P. F. ICRARCurtin;Atnfcass;HartRAO;U. Southampton
通讯作者:
U. Southampton
DOI:
10.1111/j.1365-2966.2008.13788.x
发表时间:
2008
影响因子:
4.8
作者:
V. Tudose;R. Fender;A. Tzioumis;R. Spencer;M. V. D. K. Amsterdam;Bucharest;Southampton;Atnf;Manchester
通讯作者:
Manchester
DOI:
10.1063/1.53979
发表时间:
1997
期刊:
arXiv: Astrophysics
影响因子:
--
作者:
R. Fender
通讯作者:
R. Fender
DOI:
10.1111/j.1365-2966.2011.19708.x
发表时间:
2011
影响因子:
4.8
作者:
D. Calvelo;R. Fender;A. Tzioumis;N. Kawai;J. Broderick;M. Bell
通讯作者:
M. Bell