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The Galactic halo magnetic field revisited
Sun, Xiao-Hui1,2; Reich, Wolfgang2
AbstractRecently, Sun et al published new Galactic 3D-models of magnetic fields in the disk and halo of the Milky Way and the distribution of cosmic-ray electron density by taking into account the thermal electron density model NE2001 by Cordes & Lazio The models successfully reproduce observed continuum and polarization all-sky maps and the distribution of rotation measures of extragalactic sources across the sky However, the model parameters obtained for the Galactic halo, although reproducing the observations, seem physically unreasonable the magnetic field needs to be significantly stronger in the Galactic halo than in the plane and the cosmic-ray distribution must be truncated at about 1 kpc to avoid excessive synchrotron emission from the halo The reason for these unrealistic parameters was the low scale-height of the warm thermal gas of about 1 kpc adopted in the NE2001 model However, this scale-height seemed reasonable and was well studied by numerous investigations Recently, the scale-height of the warm gas in the Galaxy was revised by Gaensler et al to about 1 8 kpc, by showing that the 1 kpc scale-height results from a systematic bias in the analysis of pulsar data This implies a higher thermal electron density in the Galactic halo which in turn reduces the halo magnetic field strength to account for the observed rotation measures of extragalactic sources We slightly modified the NE2001 model according to the new scale-height and revised the Sun et al model parameters accordingly the strength of the regular halo magnetic field is now 2 mu G or lower, and the physically unrealistic cutoff in z for the cosmic-ray electron density is removed The simulations based on the revised 3D-models reproduce all-sky observations as before
KeywordIsm Magnetic Fields Ism Structure Radio Continuum Ism
Indexed BySCI
WOS IDWOS:000285676800009
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Cited Times:60[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
Recommended Citation
GB/T 7714
Sun, Xiao-Hui,Reich, Wolfgang. The Galactic halo magnetic field revisited[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2010,10(12):1287-1297.
APA Sun, Xiao-Hui,&Reich, Wolfgang.(2010).The Galactic halo magnetic field revisited.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,10(12),1287-1297.
MLA Sun, Xiao-Hui,et al."The Galactic halo magnetic field revisited".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 10.12(2010):1287-1297.
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