منابع مشابه
Optical identification of IGR J 19140 + 0951
IGR J19140+0951 was discovered by INTEGRAL in 2003 in the 4-100 keV band. Observations with INTEGRAL and RXTE provide a tentative identification as a high-mass X-ray binary (HMXB) with a neutron star as accretor. However, an optical counterpart was thus far not established. Neither was the presence of a pulsar, which is commonly observed in HMXBs. We have observed IGR J19140+0951 with Chandra a...
متن کاملThe optical counterpart of IGR J00291+5934 in quiescence
Aims. The recent (December 2004) discovery of the sixth accretion-powered millisecond X-ray pulsar IGR J00291+5934 provides a very good chance to deepen our knowledge of such systems. Although these systems are well studied at high energies, poor informations are available for their optical/NIR counterparts during quiescence. Up to now, only for SAX J1808.4-3658, the first discovered system of ...
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در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولOptical and X–ray Observations of Igr J00291+5934 in Quiescence
We report on optical and X–ray observations of the accretion powered ms pulsar IGR J00291+5934 in quiescence. Time resolved I–band photometry has been obtained with the 4.2 m William Herschel Telescope, while a 3 ks Chandra observation provided contemporaneous X–ray coverage. We found an unabsorbed 0.5–10 keV X–ray flux of 1×10 erg cm s which implies that the source was in quiescence at the tim...
متن کاملIGR Report: GR/M37493/01
Design tools for software engineering have found a good market, but they concentrate strongly on pictorial front-ends; they need to be supported by effective tools for analysis and transformation. This project aimed to make a small but seminal contribution towards the development of such tools. The goal was to draw together the advances made in a variety of programming calculi and the advances ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20053411