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A study on diffuse source detection by HXMT scanning observation | | Ju Guan
; Ti-Pei Li
; Mei Wu
; Li-Ming Song
; Zhuo-Xi Huo
; | | Date: |
30 Nov 2015 | | Abstract: | The Hard X-ray Modulation Telescope (HXMT) is a collimated scan X-ray
satellite mainly devoted to a sensitive all-sky survey and pointed observations
in 1-250 keV. We expect various diffuse sources to be detected in its scanning
observations due to the large rigidity factor of the telescope. Diffuse source
detection performance of HXMT scanning observation depends not only on the
instrument but also on its data analysis method since images have to be
reconstructed from HXMT observed data. In this paper, we introduce a multiscale
maximum entropy (MSME) algorithm for HXMT image restoration and propose an
improved method, ensemble multiscale maximum entropy (EMSME) method, to
alleviate the problem of mode mixing exiting in MSME. Simulation have been
performed on the detection of the diffuse source Cen A by HXMT in the all-sky
survey mode. The results show that the MSME method is adapted to the
deconvolution task of HXMT for diffuse source detection and the improved method
could suppress noise and improve the correlation and signal-to-noise ratio,
thus proving itself a better algorithm for image restoration. Through one
all-sky survey, HXMT could reach a capacity of detecting a diffuse source with
maximum differential flux of 0.5 mCrab. | | Source: | arXiv, 1511.9307 | | Services: | Forum | Review | PDF | Favorites | |
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