Bibcode
DOI
Gutierrez de La Cruz, C. M.; Davies, R. D.; Rebolo, R.; Watson, R. A.; Hancock, S.; Lasenby, A. N.
Referencia bibliográfica
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 442, no. 1, p. 10-22
Advertised on:
3
1995
Revista
Número de citas
29
Número de citas referidas
19
Descripción
We present maps of the sky at intermediate angular resolution (5 deg) of
the declination range 35.0-45.0 deg obtained with the Tenerife cosmic
microwave background (CMB) experiments using data up until 1992. The
data were taken with bean-switching radiometers operating at 10.4 and
14.9 GHz. Right ascension scans were made at 2.5 deg declination
intervals centered on decl. +40 deg covering 3500 sq deg of sky. The
observations have been compared with known point sources and estimates
of Galactic emission as a consistency check on the integrity of the data
set. After subtraction of radio sources, the section of our data from
R.A. 161 deg to 230 deg has been analyzed using a likelihood method with
a Gaussian autocorrelation function. At 10.4 and 14.9 GHz we find
evidence for fluctuations with intrinsic amplitudes of square root
C0 = 41(+26, -30) and 66(+29, -22) micro-K (68% confidence
limits), respectively, on a coherence scale of 4 deg. These levels are
consistent with the expected rms sky signal from the COBE differential
microwave radiometer first-year resuts and with the CMB signal detected
at 14.9 and 33 GHz in the decl. = +40 deg strip by Hancock et al.
(1994). Our results at 10.4 GHz set strong upper limits on the Galactic
contamination at 14.9 GHz, suggesting that the signal found at the
latter frequency is probably dominated by cosmological fluctuations.