Rogers, Alan E. E. and Bowman, Judd D. (2008) Spectral index of the diffuse radio background measured from 100 to 200 MHz. Astronomical Journal, 136 (2). pp. 641-648. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20090512-093527890
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The mean absolute brightness temperature of the diffuse radio background was measured as a function of frequency in a continuous band between 100 and 200 MHz over an effective solid angle of ~π sr at high Galactic latitude. A spectral brightness temperature index of β = 2.5 ± 0.1 (αS = 0.5) was derived from the observations, where the error limits are 3σ and include estimates of the instrumental systematics. Zenith drift scans with central declination δ = –26.5° and spanning right ascensions 0 < α < 10 h yielded little variation in the mean spectral index. The mean absolute brightness temperature at ν = 150 MHz was found to reach a minimum of T = 237 ± 10 K at α = 2.5 h. Combining these measurements with those of Haslam et al. yields a spectral index of β = 2.52 ± 0.04 between 150 < ν < 408 MHz.
|Additional Information:||© 2008 The American Astronomical Society. Received 2008 April 15; accepted 2008 May 31; published 2008 July 4. This work was supported by the Massachusetts Institute of Technology, School of Science, and by the NSF through grant AST-0457585. J.D.B. is supported by NASA through Hubble Fellowship grant HF-01205.01-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.|
|Subject Keywords:||galaxy: general; radio continuum: general; techniques: spectroscopic|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||10 Jul 2009 16:10|
|Last Modified:||26 Dec 2012 11:00|
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