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نویسندگان مقالات پربازدید :
اخترفیزیک و علوم فضایی 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • investigation of x-ray cavities in the cooling flow system abell 1991

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 827
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we present results based on the systematic analysis of chandra archive data on the x-ray bright abell richness class-i type cluster abell 1991 with an objective to investigate properties of the x-ray cavities hosted by this system. the unsharp masked image as well as 2-d β model subtracted residual image of abell 1991 reveals a pair of x-ray cavities and a region of excess emission in the central ∼12 kpc region. both the cavities are of ellipsoidal shape and exhibit an order of magnitude deficiency in the x-ray surface brightness compared to that in the undisturbed regions. spectral analysis of x-ray photons extracted from the cavities lead to the temperature values equal to 1.77+0.19−0.12 kev for n-cavity and 1.53+0.05−0.06 kev for s-cavity, while that for the excess x-ray emission region is found to be equal to 2.06+0.12−0.07 kev . radial temperature profile derived for abell 1991 reveals a positive temperature gradient, reaching to a maximum of 2.63 kev at ∼76 kpc and then declines in outward direction. 0.5–2.0 kev soft band image of the central 15′′ region of abell 1991 reveals relatively cooler three different knot like features that are about 10′′ off the x-ray peak of the cluster. total power of the cavities is found to be equal to ∼8.64×1043 ergs−1 , while the x-ray luminosity within the cooling radius is found to be 6.04×1043 ergs−1 , comparison of which imply that the mechanical energy released by the central agn outburst is sufficient to balance the radative loss.

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