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26 April 2024 |
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New Cosmological Structures on Medium Angular Scales Detected with the Tenerife Experiments | | C. M. Gutierrez
; S. Hancock
; R. D. Davies
; R. Rebolo
; R. A. Watson
; R. J. Hoyland
; A. N. Lasenby
; A. W. Jones ( Instituto de Astrofisica de Canarias
; Mullard Radio Astronomy Observatory
; Cavendish Laboratory University of Manchester
; Nuffield Radio Astronomy Laboratories
; Jodrell Bank
; | | Date: |
21 Feb 1997 | | Subject: | astro-ph | | Affiliation: | Instituto de Astrofisica de Canarias (IAC), Mullard Radio Astronomy Observatory, Cavendish Laboratory (MRAO) University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank (NRAL) | | Abstract: | 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. | | Source: | arXiv, astro-ph/9702179 | | Services: | Forum | Review | PDF | Favorites | |
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