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Fermi Detection of a Luminous -Ray Pulsar in a Globular Cluster

聚焦生物添加于 2011-11-6 17:41 | 2383 次阅读 | 0 个评论

作者
Freire PCC, Abdo AA, Ajello M, Allafort A, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Camilo F, Caraveo PA, Cecchi C, Celik O, Charles E, Chekhtman A, Cheung CC, Chiang J, Ciprini S, Claus R, Cognard I, Cohen-Tanugi J, Cominsky LR, de Palma F, Dermer CD, do Couto e Silva E, Dormody M, Drell PS, Dubois R, Dumora D, Espinoza CM, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Fortin P, Fukazawa Y, Fusco P, Gargano F, Gasparrini ...
摘要
We report the Fermi Large Area Telescope detection of γ-ray (>100 MeV) pulsations from pulsar J1823−3021A in the globular cluster NGC 6624 with high significance (∼7 σ). Its γ-ray luminosity Lγ = (8.4 ±1.6) × 1034 erg s−1 is the highest observed for any millisecond pulsar (MSP) to date, and it accounts for most of the cluster emission. The nondetection of the cluster in the off-pulse phase implies that it contains <32 γ-ray MSPs, not ∼100 as previously estimated. The γ-ray luminosity indicates that the unusually large rate of change of its period is caused by its intrinsic spin-down. This implies that J1823−3021A has the largest magnetic field and is the youngest MSP ever detected and that such anomalous objects might be forming at rates comparable to those of the more normal MSPs.
详细资料
- 文献种类:期刊
- 期刊名称: Science
- 期刊缩写: Science
- ISBN: 0036-8075
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迄今为止最亮的毫秒脉冲星

费米大视场望远镜合作机构的研究人员发现了一颗独特明亮的脉冲星，它位于一个球状星团，或者说是一个有成千上万颗甚或数百万颗星星的紧凑星群中，它们是环绕着我们的星系运行的。 Paulo Freire及其同事提出，该称之为J1823-3021A的毫秒脉冲星有着最大的磁场，并且比记录在案的其它任何一颗毫秒脉冲星的星龄都要年轻。他们说，它肯定是用伽玛射线探测到的最遥远的脉冲星。据研究人员披露，J1823-3021A是在一个位于距离地球约2万7000光年之外的人马座中的某个球状星团中旋转的。起初，Freire和他的同事认为，这些强烈的伽玛射线是从一群位于球状星团内的毫秒脉冲星发射的，它们在过去仅被无线电波长探测到。但是，在用费米大视场望远镜进行更为仔细的检查时，他们意识到，该星团的伽玛射线是由这颗单一的脉冲星J1823-3021A所主导的。他们的发现提示，在整个银河中可能存在着许多这样的极端脉冲星。至少，在球状星团中，它们正在形成的速度似乎与其它的毫秒脉冲星的形成速度类似。

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