X-RAY BINARIES IN THE ULTRAHIGH ENCOUNTER RATE GLOBULAR CLUSTER NGC 6388
We report the results of a joint Chandra Hubble Space Telescope study of the X-ray binary (XRB) population in the massive, high-density globular cluster NGC 6388. NGC 6388 has one of the highest predicted XRB production rates of any Galactic cluster. We detected a large population of 61 Chandra sour...
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| Veröffentlicht in: | The Astrophysical journal 2012-09, Vol.756 (2), p.1-15, Article 147 |
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| creator | EDWARD MAXWELL, J LUGGER, Phyllis M COHN, Haldan N HEINKE, Craig O GRINDLAY, Jonathan E BUDAC, Sonia A DRUKIER, Gordon A BAILYN, Charles D |
| description | We report the results of a joint Chandra Hubble Space Telescope study of the X-ray binary (XRB) population in the massive, high-density globular cluster NGC 6388. NGC 6388 has one of the highest predicted XRB production rates of any Galactic cluster. We detected a large population of 61 Chandra sources within the half-mass radius with L sub(X) > 5 x 10 super(30) erg s super(-1). From the X-ray colors, luminosities, (lack of) variability, and spectral fitting, we identify five as likely quiescent low-mass X-ray binaries. Due to the extremely crowded nature of the core of NGC 6388, finding optical identifications to Chandra sources is challenging. We have identified four blue, optically variable counterparts to spectrally hard X-ray sources, evidence that these are bright cataclysmic variables (CVs). One showed variability of 2 mag in V, indicative of a dwarf nova eruption. One other likely CV is identified by its X-ray spectrum (partial covering with high N sub(H)) and strong variability, making five likely CVs identified in this cluster. The relatively bright optical magnitudes of these sources put them in the same class as CV1 in M15 and the brightest CVs in 47 Tuc. |
| doi_str_mv | 10.1088/0004-637X/756/2/147 |
| format | Article |
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NGC 6388 has one of the highest predicted XRB production rates of any Galactic cluster. We detected a large population of 61 Chandra sources within the half-mass radius with L sub(X) > 5 x 10 super(30) erg s super(-1). From the X-ray colors, luminosities, (lack of) variability, and spectral fitting, we identify five as likely quiescent low-mass X-ray binaries. Due to the extremely crowded nature of the core of NGC 6388, finding optical identifications to Chandra sources is challenging. We have identified four blue, optically variable counterparts to spectrally hard X-ray sources, evidence that these are bright cataclysmic variables (CVs). One showed variability of 2 mag in V, indicative of a dwarf nova eruption. One other likely CV is identified by its X-ray spectrum (partial covering with high N sub(H)) and strong variability, making five likely CVs identified in this cluster. 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NGC 6388 has one of the highest predicted XRB production rates of any Galactic cluster. We detected a large population of 61 Chandra sources within the half-mass radius with L sub(X) > 5 x 10 super(30) erg s super(-1). From the X-ray colors, luminosities, (lack of) variability, and spectral fitting, we identify five as likely quiescent low-mass X-ray binaries. Due to the extremely crowded nature of the core of NGC 6388, finding optical identifications to Chandra sources is challenging. We have identified four blue, optically variable counterparts to spectrally hard X-ray sources, evidence that these are bright cataclysmic variables (CVs). One showed variability of 2 mag in V, indicative of a dwarf nova eruption. One other likely CV is identified by its X-ray spectrum (partial covering with high N sub(H)) and strong variability, making five likely CVs identified in this cluster. The relatively bright optical magnitudes of these sources put them in the same class as CV1 in M15 and the brightest CVs in 47 Tuc.</description><subject>Astronomy</subject><subject>ASTROPHYSICS</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>BINARY STARS</subject><subject>Chemical vapor synthesis</subject><subject>COSMIC X-RAY SOURCES</subject><subject>DENSITY</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Fittings</subject><subject>GAMMA ASTRONOMY</subject><subject>Globular clusters</subject><subject>HARD X RADIATION</subject><subject>Hubble Space Telescope</subject><subject>LUMINOSITY</subject><subject>MASS</subject><subject>Nova</subject><subject>NOVAE</subject><subject>SPACE</subject><subject>Spectra</subject><subject>STAR CLUSTERS</subject><subject>TELESCOPES</subject><subject>X-RAY SPECTRA</subject><subject>X-ray stars</subject><subject>X-rays</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqNkU1rnVAQhg-hhdym_QXZHCiFbuw93x9LI_YqiBeMQrI6zD1RajGaeswi_77aG7LoonQ1zPDM-zLzInRNyTdKjNkTQkSkuL7ba6n2bE-FvkA7KrmJBJf6Hdq9EZfoQwg_t5ZZu0PZXVTF9_gmL-MqT29xXuI6S3FT1FWc5YcMp2VybMo6rXAV1yk-FMebpogrnBTN7TYtDwlW3JiP6H0HQ2g_vdYr1HxP6ySLiuMhT-Ii8lyYJRIWPGgtvTl14kFTaMUD1ScJwnLFOOtU5zV069gS0IaCYh4o2JOl6mQ84Vfo81l3Ckvvgu-X1v_w0zi2fnGMEcu4Viv19Uw9zdOv5zYs7rEPvh0GGNvpOTiqJZfEUC7_A2WMKsuNXlF-Rv08hTC3nXua-0eYXxwlbgvCbX9125vdGoRjbg1i3fryagDBw9DNMPo-vK0yxSUVfzj7l_p6HCz9NC4z9MM_PX4DBIWR_w</recordid><startdate>20120910</startdate><enddate>20120910</enddate><creator>EDWARD MAXWELL, J</creator><creator>LUGGER, Phyllis M</creator><creator>COHN, Haldan N</creator><creator>HEINKE, Craig O</creator><creator>GRINDLAY, Jonathan E</creator><creator>BUDAC, Sonia A</creator><creator>DRUKIER, Gordon A</creator><creator>BAILYN, Charles D</creator><general>IOP</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20120910</creationdate><title>X-RAY BINARIES IN THE ULTRAHIGH ENCOUNTER RATE GLOBULAR CLUSTER NGC 6388</title><author>EDWARD MAXWELL, J ; 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NGC 6388 has one of the highest predicted XRB production rates of any Galactic cluster. We detected a large population of 61 Chandra sources within the half-mass radius with L sub(X) > 5 x 10 super(30) erg s super(-1). From the X-ray colors, luminosities, (lack of) variability, and spectral fitting, we identify five as likely quiescent low-mass X-ray binaries. Due to the extremely crowded nature of the core of NGC 6388, finding optical identifications to Chandra sources is challenging. We have identified four blue, optically variable counterparts to spectrally hard X-ray sources, evidence that these are bright cataclysmic variables (CVs). One showed variability of 2 mag in V, indicative of a dwarf nova eruption. One other likely CV is identified by its X-ray spectrum (partial covering with high N sub(H)) and strong variability, making five likely CVs identified in this cluster. 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| subjects | Astronomy ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY BINARY STARS Chemical vapor synthesis COSMIC X-RAY SOURCES DENSITY Earth, ocean, space Exact sciences and technology Fittings GAMMA ASTRONOMY Globular clusters HARD X RADIATION Hubble Space Telescope LUMINOSITY MASS Nova NOVAE SPACE Spectra STAR CLUSTERS TELESCOPES X-RAY SPECTRA X-ray stars X-rays |
| title | X-RAY BINARIES IN THE ULTRAHIGH ENCOUNTER RATE GLOBULAR CLUSTER NGC 6388 |
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