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19 April 2024 |
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ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz | | D. J. Fixsen
; A. Kogut
; S. Levin
; M. Limon
; P. Lubin
; P. Mirel
; M. Seiffert
; J. Singal
; E. Wollack
; T. Villela
; C. A. Wuensche
; | | Date: |
5 Jan 2009 | | Abstract: | The ARCADE 2 instrument has measured the absolute temperature of the sky at
frequencies 3, 8, 10, 30, and 90 GHz, using an open-aperture cryogenic
instrument observing at balloon altitudes with no emissive windows between the
beam-forming optics and the sky. An external blackbody calibrator provides an
{it in situ} reference. Systematic errors were greatly reduced by using
differential radiometers and cooling all critical components to physical
temperatures approximating the CMB temperature. A linear model is used to
compare the output of each radiometer to a set of thermometers on the
instrument. Small corrections are made for the residual emission from the
flight train, balloon, atmosphere, and foreground Galactic emission. The ARCADE
2 data alone show an extragalactic rise of $50pm7$ mK at 3.3 GHz in addition
to a CMB temperature of $2.730pm .004$ K. Combining the ARCADE 2 data with
data from the literature shows a background power law spectrum of $T=1.26pm
0.09$ [K] $(
u/
u_0)^{-2.60pm 0.04}$ from 22 MHz to 10 GHz ($
u_0=1$ GHz)
in addition to a CMB temperature of $2.725pm .001$ K. | | Source: | arXiv, 0901.0555 | | Services: | Forum | Review | PDF | Favorites | |
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