The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters
The MAVERIC survey is the first deep radio continuum imaging survey of Milky Way globular clusters, with a central goal of finding and classifying accreting compact binaries, including stellar-mass black holes. Here we present radio source catalogs for 25 clusters with ultra-deep Karl G. Jansky Very...
| 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/20.500.11937/90035 |
| _version_ | 1848765315925671936 |
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| author | Shishkovsky, L. Strader, J. Chomiuk, L. Tremou, E. Tudor, V. Miller-Jones, James Bahramian, Arash Heinke, C.O. Maccarone, T.J. Sivakoff, G.R. |
| author_facet | Shishkovsky, L. Strader, J. Chomiuk, L. Tremou, E. Tudor, V. Miller-Jones, James Bahramian, Arash Heinke, C.O. Maccarone, T.J. Sivakoff, G.R. |
| author_sort | Shishkovsky, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The MAVERIC survey is the first deep radio continuum imaging survey of Milky Way globular clusters, with a central goal of finding and classifying accreting compact binaries, including stellar-mass black holes. Here we present radio source catalogs for 25 clusters with ultra-deep Karl G. Jansky Very Large Array observations. The median observing time was 10 hr per cluster, resulting in typical rms sensitivities of 2.3 and 2.1 μJy per beam at central frequencies of 5.0 and 7.2 GHz, respectively. We detect nearly 1300 sources in our survey at 5σ, and while many of these are likely to be background sources, we also find strong evidence for an excess of radio sources in some clusters. The radio spectral index distribution of sources in the cluster cores differs from the background, and shows a bimodal distribution. We tentatively classify the steep-spectrum sources (those much brighter at 5.0 GHz) as millisecond pulsars and the flat-spectrum sources as compact or other kinds of binaries. These provisional classifications will be solidified with the future addition of X-ray and optical data. The outer regions of our images represent a deep, relatively wide-field (∼0.4 deg2) and high-resolution C band background survey, and we present source counts calculated for this area. We also release radio continuum images for these 25 clusters to the community. |
| first_indexed | 2025-11-14T11:33:18Z |
| format | Journal Article |
| id | curtin-20.500.11937-90035 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:33:18Z |
| publishDate | 2020 |
| publisher | IOP PUBLISHING LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-900352023-02-07T06:14:38Z The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters Shishkovsky, L. Strader, J. Chomiuk, L. Tremou, E. Tudor, V. Miller-Jones, James Bahramian, Arash Heinke, C.O. Maccarone, T.J. Sivakoff, G.R. Science & Technology Physical Sciences Astronomy & Astrophysics Globular star clusters Radio source counts Surveys X-ray binary stars Radio pulsars Radio sources MASS BLACK-HOLES X-RAY SOURCES MILLISECOND PULSARS SOURCE POPULATION NEUTRON-STAR FIELD-SOUTH EMISSION CONTINUUM CHANDRA BINARIES The MAVERIC survey is the first deep radio continuum imaging survey of Milky Way globular clusters, with a central goal of finding and classifying accreting compact binaries, including stellar-mass black holes. Here we present radio source catalogs for 25 clusters with ultra-deep Karl G. Jansky Very Large Array observations. The median observing time was 10 hr per cluster, resulting in typical rms sensitivities of 2.3 and 2.1 μJy per beam at central frequencies of 5.0 and 7.2 GHz, respectively. We detect nearly 1300 sources in our survey at 5σ, and while many of these are likely to be background sources, we also find strong evidence for an excess of radio sources in some clusters. The radio spectral index distribution of sources in the cluster cores differs from the background, and shows a bimodal distribution. We tentatively classify the steep-spectrum sources (those much brighter at 5.0 GHz) as millisecond pulsars and the flat-spectrum sources as compact or other kinds of binaries. These provisional classifications will be solidified with the future addition of X-ray and optical data. The outer regions of our images represent a deep, relatively wide-field (∼0.4 deg2) and high-resolution C band background survey, and we present source counts calculated for this area. We also release radio continuum images for these 25 clusters to the community. 2020 Journal Article http://hdl.handle.net/20.500.11937/90035 10.3847/1538-4357/abb880 English http://purl.org/au-research/grants/arc/FT140101082 http://creativecommons.org/licenses/by/4.0/ IOP PUBLISHING LTD fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics Globular star clusters Radio source counts Surveys X-ray binary stars Radio pulsars Radio sources MASS BLACK-HOLES X-RAY SOURCES MILLISECOND PULSARS SOURCE POPULATION NEUTRON-STAR FIELD-SOUTH EMISSION CONTINUUM CHANDRA BINARIES Shishkovsky, L. Strader, J. Chomiuk, L. Tremou, E. Tudor, V. Miller-Jones, James Bahramian, Arash Heinke, C.O. Maccarone, T.J. Sivakoff, G.R. The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters |
| title | The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters |
| title_full | The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters |
| title_fullStr | The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters |
| title_full_unstemmed | The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters |
| title_short | The MAVERIC Survey: Radio Catalogs and Source Counts from Deep Very Large Array Imaging of 25 Galactic Globular Clusters |
| title_sort | maveric survey: radio catalogs and source counts from deep very large array imaging of 25 galactic globular clusters |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics Globular star clusters Radio source counts Surveys X-ray binary stars Radio pulsars Radio sources MASS BLACK-HOLES X-RAY SOURCES MILLISECOND PULSARS SOURCE POPULATION NEUTRON-STAR FIELD-SOUTH EMISSION CONTINUUM CHANDRA BINARIES |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/90035 |