1996/09/30 by L. Piccirillo, Bruno Femenía, B. Femenia +10 · 2 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Radio Astronomy Observations and Technology #Superconducting and THz Device Technology #astro-ph
paper · pdf · doi:10.1086/310471
uuencoded, g-zipped tar file containing a 14 page (AASTEX) LaTEX file with 3 PostScript figures. Revision: Minor revisions made; this is the verion which will appear in Astroph. J. Lett
arxiv created 1996/12/04 · openalex publication_date 1997/02/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
First results of a cosmic microwave background (CMB) anisotropy experiment conducted at the Observatorio del Teide (Tenerife, Spain) are presented. The instrument is a four channel (3.1, 2.1, 1.3, and 1.1 mm) 3 He bolometer system coupled to a 45 cm diameter telescope. The resultant configuration is sensitive to structures on angular scales ~1°-2°. We use the channels at the two highest frequencies for monitoring the atmosphere and apply a simple method to subtract this contribution in channels 1 (3.1 mm) and 2 (2.1 mm). The most intense structure at these two frequencies is the Galactic crossing, with peak amplitudes of ~350 μK. These crossings have been clearly detected with the amplitude and shape predicted. This demonstrates that our multifrequency observations allow an effective assessment and subtraction of the atmospheric contribution. In the section of data at high Galactic latitude we obtain sensitivities ~40 μK beam -1 . The statistical analyses show the presence of common signals between channels 1 and 2. Assuming a simple Gaussian autocorrelation model with a scale of coherence θ c = 1 32 for the signal, a likelihood analysis of this section of data reveals the presence of fluctuations with intrinsic amplitude C 0 1/2 = 76 −32 +42 μK (with a 68% confidence limit including an ~20% calibration uncertainty). Since residual atmospheric noise might still contaminate our results, we also give our result as an upper limit of 118 μK at a 95% confidence limit.