A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752
We report the results of a deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in the nearby, core-collapsed globular cluster, NGC 6752. We combined new and archival Chandra imaging to detect 51 X-ray sources (12 of which are new) within the 1.9 arcmin half-light rad...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2021
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/91519 |
| _version_ | 1848765536709640192 |
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| author | Cohn, H.N. Lugger, P.M. Zhao, Y. Tudor, V. Heinke, C.O. Cool, A.M. Anderson, J. Strader, J. Miller-Jones, James |
| author_facet | Cohn, H.N. Lugger, P.M. Zhao, Y. Tudor, V. Heinke, C.O. Cool, A.M. Anderson, J. Strader, J. Miller-Jones, James |
| author_sort | Cohn, H.N. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report the results of a deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in the nearby, core-collapsed globular cluster, NGC 6752. We combined new and archival Chandra imaging to detect 51 X-ray sources (12 of which are new) within the 1.9 arcmin half-light radius. Three radio sources in deep ATCA 5 and 9 GHz radio images match with Chandra sources. We have searched for optical identifications for the expanded Chandra source list using deep Hubble Space Telescope photometry in B435, R625, H α, UV275, and U336. Among the entire sample of 51 Chandra sources, we identify 18 cataclysmic variables (CVs), 9 chromospherically active binaries (ABs), 3 red giants (RGs), 3 galaxies (GLXs), and 6 active galactic nuclei (AGNs). Three of the sources are associated with millisecond pulsars (MSPs). As in our previous study of NGC 6752, we find that the brightest CVs appear to be more centrally concentrated than the faintest CVs, although the effect is no longer statistically significant as a consequence of the inclusion in the faint group of two intermediate brightness CVs. This possible difference in the radial distributions of the bright and faint CV groups appears to indicate that mass segregation has separated them. We note that photometric incompleteness in the crowded central region of the cluster may also play a role. Both groups of CVs have an inferred mass above that of the main-sequence turnoff stars. We discuss the implications for the masses of the CV components. |
| first_indexed | 2025-11-14T11:36:49Z |
| format | Journal Article |
| id | curtin-20.500.11937-91519 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:36:49Z |
| publishDate | 2021 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-915192023-05-11T03:09:48Z A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 Cohn, H.N. Lugger, P.M. Zhao, Y. Tudor, V. Heinke, C.O. Cool, A.M. Anderson, J. Strader, J. Miller-Jones, James Science & Technology Physical Sciences Astronomy & Astrophysics binaries: close novae, cataclysmic variables globular clusters: individual: NGC 6752 X-rays: binaries HUBBLE-SPACE-TELESCOPE FAR-ULTRAVIOLET SURVEY POST-CORE-COLLAPSE GLOBULAR-CLUSTERS CATACLYSMIC VARIABLES MILLISECOND PULSARS DYNAMICAL FORMATION BINARY-SYSTEMS STAR-CLUSTERS WHITE-DWARFS We report the results of a deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in the nearby, core-collapsed globular cluster, NGC 6752. We combined new and archival Chandra imaging to detect 51 X-ray sources (12 of which are new) within the 1.9 arcmin half-light radius. Three radio sources in deep ATCA 5 and 9 GHz radio images match with Chandra sources. We have searched for optical identifications for the expanded Chandra source list using deep Hubble Space Telescope photometry in B435, R625, H α, UV275, and U336. Among the entire sample of 51 Chandra sources, we identify 18 cataclysmic variables (CVs), 9 chromospherically active binaries (ABs), 3 red giants (RGs), 3 galaxies (GLXs), and 6 active galactic nuclei (AGNs). Three of the sources are associated with millisecond pulsars (MSPs). As in our previous study of NGC 6752, we find that the brightest CVs appear to be more centrally concentrated than the faintest CVs, although the effect is no longer statistically significant as a consequence of the inclusion in the faint group of two intermediate brightness CVs. This possible difference in the radial distributions of the bright and faint CV groups appears to indicate that mass segregation has separated them. We note that photometric incompleteness in the crowded central region of the cluster may also play a role. Both groups of CVs have an inferred mass above that of the main-sequence turnoff stars. We discuss the implications for the masses of the CV components. 2021 Journal Article http://hdl.handle.net/20.500.11937/91519 10.1093/mnras/stab2636 English http://purl.org/au-research/grants/arc/FT140101082 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics binaries: close novae, cataclysmic variables globular clusters: individual: NGC 6752 X-rays: binaries HUBBLE-SPACE-TELESCOPE FAR-ULTRAVIOLET SURVEY POST-CORE-COLLAPSE GLOBULAR-CLUSTERS CATACLYSMIC VARIABLES MILLISECOND PULSARS DYNAMICAL FORMATION BINARY-SYSTEMS STAR-CLUSTERS WHITE-DWARFS Cohn, H.N. Lugger, P.M. Zhao, Y. Tudor, V. Heinke, C.O. Cool, A.M. Anderson, J. Strader, J. Miller-Jones, James A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 |
| title | A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 |
| title_full | A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 |
| title_fullStr | A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 |
| title_full_unstemmed | A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 |
| title_short | A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 |
| title_sort | deep search for faint chandra x-ray sources, radio sources, and optical counterparts in ngc 6752 |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics binaries: close novae, cataclysmic variables globular clusters: individual: NGC 6752 X-rays: binaries HUBBLE-SPACE-TELESCOPE FAR-ULTRAVIOLET SURVEY POST-CORE-COLLAPSE GLOBULAR-CLUSTERS CATACLYSMIC VARIABLES MILLISECOND PULSARS DYNAMICAL FORMATION BINARY-SYSTEMS STAR-CLUSTERS WHITE-DWARFS |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/91519 |