Seiffert 2009 对河外射电背景的解释

主要内容:
貌似没有解释这个额外的不是CMB, 也不是已知射电源的射电辐射到底是什么.

精彩摘抄:
上图是在不同频率处所对应的辐射流量(和温度成正比)和频率的关系. 下图说明拟合(唯象拟合)的误差很小.

其实CMB本身的图上就说明在射电波段不是那么好的黑体, 比2.73K的辐射多了那么一点点(注意<1ghz的地方), onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://arcade.gsfc.nasa.gov/images/cmb_intensity.gif">

文章信息:
Title: Interpretation of the Extragalactic Radio Background

Authors: M. Seiffert, D. J. Fixsen, A. Kogut, S. M. Levin, M. Limon, P. M. Lubin, P. Mirel, J. Singal, T. Villela, E. Wollack, C. A. Wuensche

(Submitted on 5 Jan 2009)

Abstract: We use absolutely calibrated data between 3 and 90 GHz from the 2006 balloon flight of the ARCADE 2 instrument, along with previous measurements at other frequencies, to constrain models of extragalactic emission. Such emission is a combination of the Cosmic Microwave Background (CMB) monopole, Galactic foreground emission, the integrated contribution of radio emission from external galaxies, any spectral distortions present in the CMB, and any other extragalactic source. After removal of estimates of foreground emission from our own Galaxy, and the estimated contribution of external galaxies, we present fits to a combination of the flat-spectrum CMB and potential spectral distortions in the CMB. We find 2 sigma upper limits to CMB spectral distortions of mu

Comments:	8 pages, 4 figures
Subjects:	Astrophysics (astro-ph)
Cite as:	arXiv:0901.0559v1 [astro-ph]