A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT Bright Source Catalogue
A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT Bright Source Catalogue
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ROSAT 亮源星表中检测到的孤立中子星数量的限制
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Mahabal
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文献类型：
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作者：
R. Rutledge;D. Fox;M. Bogosavljević;A. Mahabal
寻找非射电脉冲孤立中子星（INSs）的挑战在于排除与最大的x射线全天巡天——ROSAT全天巡天亮源目录（RASS BSC）中典型的非常大的误差框（~13′，1 σ半径）中的天体的关联。我们使用ROSAT x射线定位附近的光学（USNO-A2）、红外（IRAS）和无线电（NVSS）源的统计分析来搜索候选INSs，并表明这种选择将在RASS BSC中找到20%的INSs。本次选择在赤纬δ > -39°找到32个候选源，其中2个是已知的INSs， 17个是非INSs， 13个分类尚未确定。这些结果需要在RASS BSC中小于67 INSs（90%置信度，全天空，假设各向同性）的限制。这个极限适度地限制了银河系中子星冷却的天真而乐观的模型。
The challenge in searching for non-radio-pulsing isolated neutron stars (INSs) is in excluding association with objects in the very large error boxes (~13', 1 σ radius) typical of sources from the largest X-ray all-sky survey, the ROSAT All-Sky Survey Bright Source Catalogue (RASS BSC). We search for candidate INSs using statistical analysis of optical (USNO-A2), infrared (IRAS), and radio (NVSS) sources near the ROSAT X-ray localization and show that this selection would find 20% of the INSs in the RASS BSC. This selection finds 32 candidates at declinations δ > -39°, among which are two previously known INSs, 17 sources that we show are not INSs, and 13 the classification of which are as yet undetermined. These results require a limit of less than 67 INSs (90% confidence, full sky, assuming isotropy) in the RASS BSC. This limit modestly constrains a naive and optimistic model for cooling neutron stars in the Galaxy.