AXIAL RATIO OF EDGE-ON SPIRAL GALAXIES AS A TEST FOR BRIGHT RADIO HALOS

被引：9
|
作者：
Singal, J. [1 ]
Kogut, A. [2 ]
Jones, E. [1 ]
Dunlap, H. [1 ]
机构：
[1] Univ Richmond, Dept Phys, Richmond, VA 23173 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 799卷 / 01期
关键词：
Galaxy: halo; radio continuum: galaxies; ABSOLUTE SKY BRIGHTNESS; CONTINUUM OBSERVATIONS; MAGNETIC-FIELDS; EMISSION; GHZ; NGC-253; EXCESS;
D O I：
10.1088/2041-8205/799/1/L10
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use surface brightness contour maps of nearby edge-on spiral galaxies to determine whether extended bright radio halos are common. In particular, we test a recent model of the spatial structure of the diffuse radio continuum by Subrahmanyan & Cowsik which posits that a substantial fraction of the observed high-latitude surface brightness originates from an extended Galactic halo of uniform emissivity. Measurements of the axial ratio of emission contours within a sample of normal spiral galaxies at 1500 MHz and below show no evidence for such a bright, extended radio halo. Either the Galaxy is atypical compared to nearby quiescent spirals or the bulk of the observed high-latitude emission does not originate from this type of extended halo.
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页数：6
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