Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-01-05
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
11 pages 5 figures Submitted to ApJ
Scientific paper
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 $50\pm7$ mK at 3.3 GHz in addition to a CMB temperature of $2.730\pm .004$ K. Combining the ARCADE 2 data with data from the literature shows a background power law spectrum of $T=1.26\pm 0.09$ [K] $(\nu/\nu_0)^{-2.60\pm 0.04}$ from 22 MHz to 10 GHz ($\nu_0=1$ GHz) in addition to a CMB temperature of $2.725\pm .001$ K.
Fixsen Dale J.
Kogut Alan
Levin Sergey
Limon Michele
Lubin Philip
No associations
LandOfFree
ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-631287