INTEGRAL observations of TeV plerions     

A. I. D. Hoffmann  D. Horns  A. Santangelo 《Astrophysics and Space Science》2007,309(1-4):215-219

Amongst the sources seen in very high gamma-rays several are associated with Pulsar Wind Nebulae (“TeV plerions”). The study of hard X-ray/soft gamma-ray emission is providing an important insight into the energetic particle population present in these objects. The unpulsed emission from pulsar/pulsar wind nebula systems in the energy range accessible to the INTEGRAL satellite is mainly synchrotron emission from energetic and fast cooling electrons close to their acceleration site. Our analyses of public INTEGRAL data of known TeV plerions detected by ground based Cherenkov telescopes indicate a deeper link between these TeV plerions and INTEGRAL detected pulsar wind nebulae. The newly discovered TeV plerion in the northern wing of the Kookaburra region (G313.3+0.6 powered by the middle aged PSR J1420-6048) is found to have a previously unknown INTEGRAL counterpart which is besides the Vela pulsar the only middle aged pulsar detected with INTEGRAL. We do not find an INTEGRAL counterpart of the TeV plerion associated with the X-ray PWN “Rabbit” G313.3+0.1 which is possibly powered by a young pulsar.  相似文献   

3G通信技术在移动气象视频会商咿的研究与应用     

苏轶  刘树峰  孟令旺  马骏 《气象与环境科学》2012,35(1)

目前山东省气象部门已有多部移动气象台投入业务使用,在防御气象灾害和突发气象事件应急服务中发挥了重要作用。由于移动气象台通信（通过通信卫星连接互联网和气象局内音旷网）费用高,且需提前向运营商申请增加宽带以满足视频会商需求,因此提出了利用3G通信技术,建立VPDN网络访问气象局内部网络,来实现移动气象台和济南市气象台视频会商的方案。该方案的应用,大大降低了移动一气象台的通信费用,提高了传输效率。  相似文献   

Wind-swept clouds and possible triggered star formation associated with the supernova remnant G357.7+0.3     

J. P. Phillips  G. Ramos-Larios  J. A. Perez-Grana 《Monthly notices of the Royal Astronomical Society》2009,397(3):1215-1227

We present evidence for interaction between the supernova remnant (SNR) G357.7+0.3 and nearby molecular clouds, leading to the formation of wind-swept structures and bright emission rims. These features are not observed at visual wavelengths, but are clearly visible in mid-infrared mapping undertaken using the Spitzer Space Telescope . Analysis of one of these clouds, the bright cometary structure G357.46+0.60, suggests that it contains strong polycyclic aromatic hydrocarbon emission features in the 5.8 and 8.0 μm photometric bands, and that these are highly variable over relatively small spatial scales. The source is also associated with strong variations in electron density; a far-infrared continuum peak associated with dust temperatures of ∼30 K; and has previously been observed in the 1720 MHz maser transition of OH, known to be associated with SNR shock excitation of interstellar clouds. This source also appears to contain a young stellar object (YSO) within the bright rim structure, with a steeply rising spectrum between 1.25 and 24 μm. If the formation of this star has been triggered recently by the SNR, then YSO modelling suggests a stellar mass  ∼5–10 M_⊙  , and luminosity   L _YSO∼10²–2 × 10³ L_⊙  .
Finally, it is noted that a further, conical emission region appears to be associated with the Mira V1139 Sco, and it is suggested that this may represent the case of a Mira outflow interacting with a SNR. If this is the case, however, then the distance to the SNR must be ∼half of that determined from CS   J = 2–1  and 3–2 line radial velocities.  相似文献   

Excursion to Woldingham: Saturday,May 6th, 1905     

N.F. Robarts 《Proceedings of the Geologists' Association. Geologists' Association》1905,19(3):133-135

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Excursion to Mid-lincolnshire,Easter, 1905: From April 20th to 26th, 1905     

Henry Preston 《Proceedings of the Geologists' Association. Geologists' Association》1905,19(3):114-IN4

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Excursion to Flitwick and Silsoe: Saturday,April 15th, 1905     

《Proceedings of the Geologists' Association. Geologists' Association》1905,19(3):110-113

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Excursion to Erith and Crayford: Saturday,May 22nd, 1897     

《Proceedings of the Geologists' Association. Geologists' Association》1897,15(3):110-113

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Excursion to Walmer,St. Margarets,Dover, Folkestone,and Romney Marsh: Easter, 1897     

《Proceedings of the Geologists' Association. Geologists' Association》1897,15(3):97-101

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Excursion to Leicestershire: Whit-Monday,May 21st, 1877, and following day     

Wm. J. Harrison 《Proceedings of the Geologists' Association. Geologists' Association》1877,5(4):142-148

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Visit to the British Museum: March 24th, 1874     

W.H. Hudleston  James Parker 《Proceedings of the Geologists' Association. Geologists' Association》1875,4(2):91-97

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