用FAST对仙女座星系m31的新连续观测

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Research in Astronomy and Astrophysics Pub Date : 2023-10-17 DOI:10.1088/1674-4527/acfae1
wenjun Zhang, Xiaohui Sun, Jie Wang
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引用次数: 0

摘要

摘要利用角分辨率为4’、灵敏度约为16 mK的500米口径球面射电望远镜(FAST)在1.248 GHz观测到M31的新总强度图像。由于FAST对大尺度结构的高灵敏度,新的FAST图像清晰地显示了环外的弱发射。我们推导出宇宙射线电子的尺度长度为2.7 kpc,并通过比较4.8 GHz的尺度长度发现宇宙射线电子主要通过扩散传播。总强度的光谱指数沿环形变化,这可归因于同步辐射光谱的变化。这种变化很可能是由环上恒星形成速率的变化引起的。研究发现,非热发射的方位角剖面可以用沿环方向变化的轴对称大尺度磁场来解释,表明M31具有复杂的磁场构型。
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New continuum observations of the Andromeda galaxy M 31 with FAST
Abstract We present a new total intensity image of M31 at 1.248 GHz, observed with the Five-hundred-meter Aperture Spherical radio telescope (FAST) with an angular resolution of 4 and a sensitivity of about 16 mK. The new FAST image clearly reveals weak emission outside the ring due to its high sensitivity on large-scale structures. We derive a scale length of 2.7 kpc for the cosmic ray electrons and find that the cosmic ray electrons propagate mainly through diffusion by comparing the scale length at 4.8 GHz. The spectral index of the total intensity varies along the ring, which can be attributed to the variation of the spectra of synchrotron emission. This variation is likely caused by the change of star formation rates along the ring. We find that the azimuthal profile of the non-thermal emission can be interpreted by an axisymmetric large-scale magnetic field with varying pitch angle along the ring, indicating a complicated magnetic field configuration in M31.
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来源期刊
Research in Astronomy and Astrophysics
Research in Astronomy and Astrophysics 地学天文-天文与天体物理
CiteScore
3.20
自引率
16.70%
发文量
2599
审稿时长
6.0 months
期刊介绍: Research in Astronomy and Astrophysics (RAA) is an international journal publishing original research papers and reviews across all branches of astronomy and astrophysics, with a particular interest in the following topics: -large-scale structure of universe formation and evolution of galaxies- high-energy and cataclysmic processes in astrophysics- formation and evolution of stars- astrogeodynamics- solar magnetic activity and heliogeospace environments- dynamics of celestial bodies in the solar system and artificial bodies- space observation and exploration- new astronomical techniques and methods
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