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题名:
Radio spectral index variations of the SNR HB3
作者: Tian, WW; Leahy, D
关键词: ISM : individual : HB3 ; radio continuum : ISM ; ISM : supernova remnants
刊名: ASTRONOMY & ASTROPHYSICS
发表日期: 2005-06-01
DOI: 10.1051/0004-6361:20042431
卷: 436, 期:1, 页:187-193
收录类别: SCI
英文摘要: We present images of the SNR HB3 at both 408 MHz and 1420 MHz from the Canadian Galactic Plane Survey mainly based on data from the Synthesis Telescope of the Dominion Radio Astrophysical Observatory. We reproduce the 100 m-Effelsberg HB3 image at 2695 MHz at large scale, and find that there exists a background emission gradient across the HB3 area. Based on our analysis of background emission and the boundary between W3 and HB3, we give HB3's flux density as 68.6 +/- 11.5 Jy at 408 MHz and 44.8 +/- 12.0 Jy at 1420 MHz, after subtracting flux from compact sources within HB3. The integrated flux-density-based spectral index between 408 MHz and 1420 MHz is 0.34 +/- 0.15. The averaged T-T plot spectral index using all subareas is 0.36. Our measurement values are less than a previously published value of 0.6. The 408-1420 MHz spectral index varies spatially in HB3 in the range 0.1 to 0.7. We investigate the data used by previous authors, and consider more data at 232 MHz, 3650 MHz and 3900 MHz which are not included in previous calculations. There is evidence for two spectral indices for HB3 in the radio band, i.e., 0.63 ( 38-610 MHz) and 0.32 (408-3900 MHz). This is consistent with the spatial variations: the low frequency data mainly reflects the steeper indices and the high frequency data mainly reflects the flatter indices.
语种: 英语
WOS记录号: WOS:000229265500020
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/8155
Appears in Collections:光学天文研究部_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada

Recommended Citation:
Tian, WW,Leahy, D. Radio spectral index variations of the SNR HB3[J]. ASTRONOMY & ASTROPHYSICS,2005,436(1):187-193.
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