The radio spectrum and magnetic field structure of SNR HB3

被引：0
|
作者：
Shi, W.B. [1 ,3 ]
Han, J.L. [1 ]
Gao, X.Y. [1 ]
Sun, X.H. [1 ]
Xiao, L. [1 ]
Reich, P. [2 ]
Reich, W. [2 ]
机构：
[1] National Astronomical Observatories, Chinese Academy of Sciences, Jia 20 DaTun Road, ChaoYang District, Beijing 100012, China
[2] Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
[3] School of Space Science and Physics, Shandong University at Weihai, 180 Cultural West Road, Shandong 264209, China
来源：
Astronomy and Astrophysics | 2008年 / 487卷 / 02期
关键词：
Context. Evidence for a spectral flattening of the supernova remnant (SNR) HB3 (G132.7+1.3) was recently claimed in the literature based on previously published total flux density data; and the flattening was further interpreted as the discovery of thermal bremsstrahlung emission in the shell of HB3. Aims. A spectral flattening has never been observed from any SNR before. Reliable observations of HB3 at frequencies above 3000 MHz are crucial to confirm such a spectral behaviour. Methods. We extracted 4800 MHz total intensity and polarisation data of HB3 from the Sino-German 6 cm polarisation survey of the Galactic plane made with the Urumqi 25 m telescope; and analysed the spectrum of HB3; together with Effelsberg data at 1408 MHz and 2675 MHz. Results. We found an overall spectral index of HB3 of α = -0.61 ± 0.06 between 1408 MHz and 4800 MHz; similar to the index at lower frequencies. There is no spectral flattening at high frequencies. We detected strong polarised emission from HB3 at 4800 MHz. Our 4800 MHz data show a tangential field orientation in the HB3 shell. © 2008 ESO;
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页码：601 / 604
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