在Fermi LAT数据的盲频搜索中发现八个gamma-ray核
Eight gamma-ray pulsars discovered in blind frequency searches of Fermi LAT data
摘要：
我们报告发现八个伽马射线天体在盲频搜索使用LAT，机载费米伽马射线太空望远镜。这8颗恒星中有5颗是年轻的（τ_c<100 kyr），充满能量（Edot>10^36 erg/s），位于银河平面内（|b| <3 deg）。剩下的三个年龄较大，精力不足，位于飞机外。有五颗星与LAT亮伽马射线源列表中的源有关，但只有一颗PSR J1413-6205与EGRET源明显有关。PSR J1023-5746的特征年龄最小（tau_c=4.6 kyr），是迄今为止在盲探中发现的所有伽马射线天体中能量最高的（Edot=1.1E37 erg/s）。PSR J1957+5033和J2055+25的特征年龄最大（τ c~1 Myr），能量最小（Edot~ 5E 33 erg/s）。我们提出的时间模型，光变曲线，和详细的光谱参数的新的恒星。我们使用最近的XMM观测结果将PSR J2055+25的对应物识别为XMMU J205549.4+253959。此外，公开可用的钱德拉X射线档案数据使我们能够将PSR J1023-5746的可能对应物识别为微弱的高吸收源CXCRJ 102302.8 -574606。大的X射线吸收表明，这可能是迄今为止探测到的最遥远的伽马射线天体之一。PSR J 1023 -5746与TeV源HESS J 1023 -575的位置一致，位于年轻的星团Westerlund 2附近，而PSR J 1954 +2836与Milagro报道的4.3 sigma过量相一致，其能量中值为35 TeV。对这八颗射电星的深度射电跟踪观测没有发现与已知最微弱的射电星相当的脉动和上限，这表明这些射电星可以被包括在我们银河系中越来越多的射电宁静射电星中，目前有20多颗射电宁静射电星被LAT发现。
英文摘要：
We report the discovery of eight gamma-ray pulsars in blind frequency searches using the LAT, onboard the Fermi Gamma-ray Space Telescope. Five of the eight pulsars are young (tau_c<100 kyr), energetic (Edot>10^36 erg/s), and located within the Galactic plane (|b|<3 deg). The remaining three are older, less energetic, and located off the plane. Five pulsars are associated with sources included in the LAT bright gamma-ray source list, but only one, PSR J1413-6205, is clearly associated with an EGRET source. PSR J1023-5746 has the smallest characteristic age (tau_c=4.6 kyr) and is the most energetic (Edot=1.1E37 erg/s) of all gamma-ray pulsars discovered so far in blind searches. PSRs J1957+5033 and J2055+25 have the largest characteristic ages (tau_c~1 Myr) and are the least energetic (Edot~5E33 erg/s) of the newly-discovered pulsars. We present the timing models, light curves, and detailed spectral parameters of the new pulsars. We used recent XMM observations to identify the counterpart of PSR J2055+25 as XMMU J205549.4+253959. In addition, publicly available archival Chandra X-ray data allowed us to identify the likely counterpart of PSR J1023-5746 as a faint, highly absorbed source, CXOU J102302.8-574606. The large X-ray absorption indicates that this could be among the most distant gamma-ray pulsars detected so far. PSR J1023-5746 is positionally coincident with the TeV source HESS J1023-575, located near the young stellar cluster Westerlund 2, while PSR J1954+2836 is coincident with a 4.3 sigma excess reported by Milagro at a median energy of 35 TeV. Deep radio follow-up observations of the eight pulsars resulted in no detections of pulsations and upper limits comparable to the faintest known radio pulsars, indicating that these can be included among the growing population of radio-quiet pulsars in our Galaxy being uncovered by the LAT, and currently numbering more than 20.
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