| Autor: |
Bogdanov, Slavko, van, Maureen, Berg, den, Heinke, Craig O., Cohn, Haldan N., Lugger, Phyllis M., Grindlay, Jonathan E. |
| Zdroj: |
The Astrophysical Journal; January 2010, Vol. 709 Issue: 1 p241-250, 10p |
| Abstrakt: |
We present a deep Chandra X-ray Observatory study of the peculiar binary radio millisecond pulsar (MSP) PSR J1740-5340 and candidate millisecond pulsars in the globular cluster NGC 6397. The X-rays from PSR J1740-5340 appear to be non-thermal and exhibit variability at the binary period. These properties suggest the presence of a relativistic intrabinary shock formed due to interaction of a relativistic rotation-powered pulsar wind and outflow from the unusual "red-straggler/sub-subgiant" companion. We find the X-ray source U18 to show similar X-ray and optical properties to those of PSR J1740-5340, making it a strong MSP candidate. It exhibits variability on timescales from hours to years, also consistent with an intrabinary shock origin of its X-ray emission. The unprecedented depth of the X-ray data allows us to conduct a complete census of MSPs in NGC 6397. Based on the properties of the present sample of X-ray-detected MSPs in the Galaxy, we find that NGC 6397 probably hosts no more than six MSPs. |
| Databáze: |
Supplemental Index |
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