New Cosmological Structures on Medium Angular Scales Detected with the Tenerife Experiments

Details New Cosmological Structures on Medium Angular Scales Detected with the Tenerife Experiments New Cosmological Structures on Medium Angular Scales Detected with the Tenerife Experiments

1997-02-20

arxiv.org/abs/astro-ph/9702179v1

Astronomy and Astrophysics

Astrophysics

ApJ Letters accepted, 13 pages Latex (uses AASTEX) and 4 encapsulated postscript figures.

Scientific paper

10.1086/310634

We present observations at 10 and 15 GHz taken with the Tenerife experiments in a band of the sky at Dec.=+35 degrees. These experiments are sensitive to multipoles in the range l=10-30. The sensitivity per beam is 56 and 20 microK for the 10 and the 15 GHz data, respectively. After subtraction of the prediction of known radio-sources, the analysis of the data at 15 GHz at high Galactic latitude shows the presence of a signal with amplitude Delta Trms ~ 32 microK. In the case of a Harrison-Zeldovich spectrum for the primordial fluctuations, a likelihood analysis shows that this signal corresponds to a quadrupole amplitude Q_rms-ps=20.1+7.1-5.4 microK, in agreement with our previous results at Dec.+=40 degrees and with the results of the COBE DMR. There is clear evidence for the presence of individual features in the RA range 190 degrees to 250 degrees with a peak to peak amplitude of ~110 microK. A preliminary comparison between our results and COBE DMR predictions for the Tenerife experiments clearly indicates the presence of individual features common to both. The constancy in amplitude over such a large range in frequency (10-90 GHz) is strongly indicative of an intrinsic cosmological origin for these structures.

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