e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales
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 angul...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Published: |
Oxford University Press
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/8848 |
| _version_ | 1848745778597593088 |
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| author | Moin, Aquib Reynolds, Cormac Miller-Jones, James Tingay, Steven Phillips, C. Tzioumis, A. Nicolson, G. Fender, R. |
| author_facet | Moin, Aquib Reynolds, Cormac Miller-Jones, James Tingay, Steven Phillips, C. Tzioumis, A. Nicolson, G. Fender, R. |
| author_sort | Moin, Aquib |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T06:22:46Z |
| format | Journal Article |
| id | curtin-20.500.11937-8848 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:22:46Z |
| publishDate | 2011 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-88482017-09-13T14:34:28Z e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales Moin, Aquib Reynolds, Cormac Miller-Jones, James Tingay, Steven Phillips, C. Tzioumis, A. Nicolson, G. Fender, R. accretion stars: neutron stars: individual: Circinus X-1 accretion discs X-rays: binaries 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. 2011 Journal Article http://hdl.handle.net/20.500.11937/8848 10.1111/j.1365-2966.2011.18660.x Oxford University Press fulltext |
| spellingShingle | accretion stars: neutron stars: individual: Circinus X-1 accretion discs X-rays: binaries Moin, Aquib Reynolds, Cormac Miller-Jones, James Tingay, Steven Phillips, C. Tzioumis, A. Nicolson, G. Fender, R. e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales |
| title | e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales |
| title_full | e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales |
| title_fullStr | e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales |
| title_full_unstemmed | e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales |
| title_short | e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales |
| title_sort | e-vlbi observations of circinus x-1: monitoring of the quiescent and flaring radio emission on au scales |
| topic | accretion stars: neutron stars: individual: Circinus X-1 accretion discs X-rays: binaries |
| url | http://hdl.handle.net/20.500.11937/8848 |