The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters
Globular clusters host a variety of lower-luminosity (LX < 1035 erg s−1) X-ray sources, including accreting neutron stars (NSs) and black holes (BHs), millisecond pulsars (MSPs), cataclysmic variables, and chromospherically active binaries. In this paper, we provide a comprehensive catalog of mor...
| 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/20.500.11937/90034 |
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| author | Bahramian, Arash Strader, J. Miller-Jones, James Chomiuk, L. Heinke, C.O. Maccarone, T.J. Pooley, D. Shishkovsky, L. Tudor, V. Zhao, Y. Li, K.L. Sivakoff, G.R. Tremou, E. Buchner, J. |
| author_facet | Bahramian, Arash Strader, J. Miller-Jones, James Chomiuk, L. Heinke, C.O. Maccarone, T.J. Pooley, D. Shishkovsky, L. Tudor, V. Zhao, Y. Li, K.L. Sivakoff, G.R. Tremou, E. Buchner, J. |
| author_sort | Bahramian, Arash |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Globular clusters host a variety of lower-luminosity (LX < 1035 erg s−1) X-ray sources, including accreting neutron stars (NSs) and black holes (BHs), millisecond pulsars (MSPs), cataclysmic variables, and chromospherically active binaries. In this paper, we provide a comprehensive catalog of more than 1100 X-ray sources in 38 Galactic globular clusters (GCs) observed by the Chandra X-ray Observatory's Chandra/ACIS detector. The targets are selected to complement the MAVERIC survey's deep radio continuum maps of Galactic GCs. We perform photometry and spectral analysis for each source, determine a best-fit model, and assess the possibility of it being a foreground or background source based on its spectral properties and location in the cluster. We also provide basic assessments of variability. We discuss the distribution of X-ray binaries in GCs and their X-ray luminosity function, and we carefully analyze systems with LX > 1033 erg s−1. Among these moderately bright systems, we discover a new source in NGC 6539 that may be a candidate accreting stellar-mass BH or a transitional MSP. We show that quiescent NS low-mass X-ray binaries in GCs may spend ∼2% of their lifetimes as transitional MSPs in their active (LX > 1033 erg s−1) state. Finally, we identify a substantial underabundance of bright (LX > 1033 erg s−1) intermediate polars in GCs compared to the Galactic field, in contrast with the literature of the past two decades. |
| first_indexed | 2025-11-14T11:33:18Z |
| format | Journal Article |
| id | curtin-20.500.11937-90034 |
| 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-20.500.11937-900342023-02-07T03:35:58Z The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters Bahramian, Arash Strader, J. Miller-Jones, James Chomiuk, L. Heinke, C.O. Maccarone, T.J. Pooley, D. Shishkovsky, L. Tudor, V. Zhao, Y. Li, K.L. Sivakoff, G.R. Tremou, E. Buchner, J. Science & Technology Physical Sciences Astronomy & Astrophysics Globular star clusters Low-mass x-ray binary stars Neutron stars Astrophysical black holes Stellar accretion disks Celestial objects catalogs TRANSIENT NEUTRON-STAR LONG-TERM OBSERVATIONS BLACK-HOLE CANDIDATE CATACLYSMIC VARIABLES 47 TUCANAE MILLISECOND PULSAR BINARY-SYSTEMS RADIO PULSARS INTERMEDIATE POLARS DYNAMICAL FORMATION Globular clusters host a variety of lower-luminosity (LX < 1035 erg s−1) X-ray sources, including accreting neutron stars (NSs) and black holes (BHs), millisecond pulsars (MSPs), cataclysmic variables, and chromospherically active binaries. In this paper, we provide a comprehensive catalog of more than 1100 X-ray sources in 38 Galactic globular clusters (GCs) observed by the Chandra X-ray Observatory's Chandra/ACIS detector. The targets are selected to complement the MAVERIC survey's deep radio continuum maps of Galactic GCs. We perform photometry and spectral analysis for each source, determine a best-fit model, and assess the possibility of it being a foreground or background source based on its spectral properties and location in the cluster. We also provide basic assessments of variability. We discuss the distribution of X-ray binaries in GCs and their X-ray luminosity function, and we carefully analyze systems with LX > 1033 erg s−1. Among these moderately bright systems, we discover a new source in NGC 6539 that may be a candidate accreting stellar-mass BH or a transitional MSP. We show that quiescent NS low-mass X-ray binaries in GCs may spend ∼2% of their lifetimes as transitional MSPs in their active (LX > 1033 erg s−1) state. Finally, we identify a substantial underabundance of bright (LX > 1033 erg s−1) intermediate polars in GCs compared to the Galactic field, in contrast with the literature of the past two decades. 2020 Journal Article http://hdl.handle.net/20.500.11937/90034 10.3847/1538-4357/aba51d 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 Low-mass x-ray binary stars Neutron stars Astrophysical black holes Stellar accretion disks Celestial objects catalogs TRANSIENT NEUTRON-STAR LONG-TERM OBSERVATIONS BLACK-HOLE CANDIDATE CATACLYSMIC VARIABLES 47 TUCANAE MILLISECOND PULSAR BINARY-SYSTEMS RADIO PULSARS INTERMEDIATE POLARS DYNAMICAL FORMATION Bahramian, Arash Strader, J. Miller-Jones, James Chomiuk, L. Heinke, C.O. Maccarone, T.J. Pooley, D. Shishkovsky, L. Tudor, V. Zhao, Y. Li, K.L. Sivakoff, G.R. Tremou, E. Buchner, J. The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters |
| title | The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters |
| title_full | The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters |
| title_fullStr | The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters |
| title_full_unstemmed | The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters |
| title_short | The MAVERIC survey: Chandra/ACIS catalog of faint X-ray sources in 38 galactic globular clusters |
| title_sort | maveric survey: chandra/acis catalog of faint x-ray sources in 38 galactic globular clusters |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics Globular star clusters Low-mass x-ray binary stars Neutron stars Astrophysical black holes Stellar accretion disks Celestial objects catalogs TRANSIENT NEUTRON-STAR LONG-TERM OBSERVATIONS BLACK-HOLE CANDIDATE CATACLYSMIC VARIABLES 47 TUCANAE MILLISECOND PULSAR BINARY-SYSTEMS RADIO PULSARS INTERMEDIATE POLARS DYNAMICAL FORMATION |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/90034 |