The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5
Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars (MSPs) known among Galactic globular clusters. Here we report new deep 2-8 GHz radio continuum observations of Terzan 5 obtained with the Karl G. Jansky Very Large Array. We have identified a total of 24 sou...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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IOP PUBLISHING LTD
2020
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| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/91529 |
| _version_ | 1848765539408674816 |
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| author | Urquhart, R. Bahramian, Arash Strader, J. Chomiuk, L. Ransom, S.M. Wang, Y. Heinke, C. Tudor, V. Miller-Jones, James Tetarenko, A.J. MacCarone, T.J. Sivakoff, G.R. Shishkovsky, L. Swihart, S.J. Tremou, E. |
| author_facet | Urquhart, R. Bahramian, Arash Strader, J. Chomiuk, L. Ransom, S.M. Wang, Y. Heinke, C. Tudor, V. Miller-Jones, James Tetarenko, A.J. MacCarone, T.J. Sivakoff, G.R. Shishkovsky, L. Swihart, S.J. Tremou, E. |
| author_sort | Urquhart, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars (MSPs) known among Galactic globular clusters. Here we report new deep 2-8 GHz radio continuum observations of Terzan 5 obtained with the Karl G. Jansky Very Large Array. We have identified a total of 24 sources within the cluster half-light radius, including 17 within the core radius. Nineteen are associated with previously studied MSPs and X-ray binaries. Three of the new radio sources have steep radio spectra and are located within the cluster core, as expected for MSPs. These three sources have hard X-ray photon indices (Γ = 1.3-1.5) and highly variable X-ray emission, suggesting they are binary MSPs belonging to the spider class. For the most X-ray luminous of these sources, the redback spider classification is confirmed by its X-ray light curve, which shows an orbital period of 12.32 hr and double-peaked structure around X-ray maximum. The likely discovery of bright binary MSPs in a well-studied cluster like Terzan 5 highlights how deep radio continuum imaging can complement pulsar search and timing observations in finding probable eclipsing systems. The other new radio source in the core has a flat radio spectrum and is X-ray faint (erg s-1) with a photon index Γ = 2.1 ± 0.5, consistent with the properties expected for a quiescent stellar-mass black hole X-ray binary. |
| first_indexed | 2025-11-14T11:36:51Z |
| format | Journal Article |
| id | curtin-20.500.11937-91529 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:36:51Z |
| publishDate | 2020 |
| publisher | IOP PUBLISHING LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-915292023-05-04T07:26:16Z The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 Urquhart, R. Bahramian, Arash Strader, J. Chomiuk, L. Ransom, S.M. Wang, Y. Heinke, C. Tudor, V. Miller-Jones, James Tetarenko, A.J. MacCarone, T.J. Sivakoff, G.R. Shishkovsky, L. Swihart, S.J. Tremou, E. Science & Technology Physical Sciences Astronomy & Astrophysics Millisecond pulsars Globular star clusters Radio continuum emission Surveys Catalogs ECLIPSING MILLISECOND PULSAR MASS BLACK-HOLES X-RAY SOURCES STRUCTURAL PARAMETERS 47 TUCANAE SEARCH VARIABILITY POPULATION CANDIDATE DENSITY astro-ph.HE astro-ph.HE Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars (MSPs) known among Galactic globular clusters. Here we report new deep 2-8 GHz radio continuum observations of Terzan 5 obtained with the Karl G. Jansky Very Large Array. We have identified a total of 24 sources within the cluster half-light radius, including 17 within the core radius. Nineteen are associated with previously studied MSPs and X-ray binaries. Three of the new radio sources have steep radio spectra and are located within the cluster core, as expected for MSPs. These three sources have hard X-ray photon indices (Γ = 1.3-1.5) and highly variable X-ray emission, suggesting they are binary MSPs belonging to the spider class. For the most X-ray luminous of these sources, the redback spider classification is confirmed by its X-ray light curve, which shows an orbital period of 12.32 hr and double-peaked structure around X-ray maximum. The likely discovery of bright binary MSPs in a well-studied cluster like Terzan 5 highlights how deep radio continuum imaging can complement pulsar search and timing observations in finding probable eclipsing systems. The other new radio source in the core has a flat radio spectrum and is X-ray faint (erg s-1) with a photon index Γ = 2.1 ± 0.5, consistent with the properties expected for a quiescent stellar-mass black hole X-ray binary. 2020 Journal Article http://hdl.handle.net/20.500.11937/91529 10.3847/1538-4357/abb6fc English http://purl.org/au-research/grants/arc/FT140101082 IOP PUBLISHING LTD fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics Millisecond pulsars Globular star clusters Radio continuum emission Surveys Catalogs ECLIPSING MILLISECOND PULSAR MASS BLACK-HOLES X-RAY SOURCES STRUCTURAL PARAMETERS 47 TUCANAE SEARCH VARIABILITY POPULATION CANDIDATE DENSITY astro-ph.HE astro-ph.HE Urquhart, R. Bahramian, Arash Strader, J. Chomiuk, L. Ransom, S.M. Wang, Y. Heinke, C. Tudor, V. Miller-Jones, James Tetarenko, A.J. MacCarone, T.J. Sivakoff, G.R. Shishkovsky, L. Swihart, S.J. Tremou, E. The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 |
| title | The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 |
| title_full | The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 |
| title_fullStr | The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 |
| title_full_unstemmed | The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 |
| title_short | The MAVERIC Survey: New Compact Binaries Revealed by Deep Radio Continuum Observations of the Galactic Globular Cluster Terzan 5 |
| title_sort | maveric survey: new compact binaries revealed by deep radio continuum observations of the galactic globular cluster terzan 5 |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics Millisecond pulsars Globular star clusters Radio continuum emission Surveys Catalogs ECLIPSING MILLISECOND PULSAR MASS BLACK-HOLES X-RAY SOURCES STRUCTURAL PARAMETERS 47 TUCANAE SEARCH VARIABILITY POPULATION CANDIDATE DENSITY astro-ph.HE astro-ph.HE |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/91529 |