Tenerife Data Research Articles

A Characterization of the Diffuse Galactic Emissions at Large Angular Scales Using the Tenerife Data

The anomalous microwave emission (AME) has been proved to be an important component of the galactic diffuse emission in the range from 20 to 60 GHz. To discriminate between different models of AME, low frequency microwave data from 10 to 20 GHz are needed. We present here a reanalysis of published and unpublished Tenerife data from 10 to 33 GHz at large angular scales (from 5 to 15 degrees). We cross-correlate the Tenerife data to templates of the main galactic diffuse emissions: synchrotron, free-free, and thermal dust. We find evidence of dust-correlated emission in the Tenerife data that could be explained as spinning dust grain emission.

Imaging magma storage below Teide volcano (Tenerife) using scattered seismic wavefields

SUMMARY Tenerife (Canary Islands, Spain) is a volcanic island dominated by the Teide-Pico Viejo complex, with a summit height of 3718 m. After renewed signs of activity starting in 2004, an active seismic experiment was performed in 2007 to derive a tomographic model and identify seismic anomalies possibly associated with the magmatic system. To complement the tomography, a double beam-forming analysis is applied on two orthogonal 2-D profiles crossing the island to look for evidence of the existence of a magma chamber. Numerical tests allow us to investigate the best measure of coherency between traces, and show that the correlation and nth root semblance methods give better results than the classical semblance. They also demonstrate that the technique is reliable for locating scattering structures at depth, even when the velocity model is imperfect. Applying this technique to the Tenerife data set, two main anomalies can be identified: one at approximately 7–9 km b.s.l. depth in the northern part of the island, and one shallower (1–4 km b.s.l.) beneath the main summit. These structures could be linked to the magmatic system, in good agreement with previous studies. The shallowest one may be the phonolitic storage area feeding the Teide-Pico Viejo complex, while the deepest structure may be related to the basaltic system.

On dust-correlated Galactic emission in the Tenerife data

Recently correlation analyses between Galactic dust emission templates and a number of CMB data sets have led to differing claims on the origin of the Galactic contamination at low frequencies. de Oliviera-Costa {\em et al} (1999) have presented work based on Tenerife data supporting the spinning dust hypothesis. Since the frequency coverage of these data is ideal to discriminate spectrally between spinning dust and free-free emission, we used the latest version of the Tenerife data, which have lower systematic uncertainty, to study the correlation in more detail. We found however that the evidence in favor of spinning dust originates from a small region at low Galactic latitude where the significance of the correlation itself is low and is compromised by systematic effects in the Galactic plane signal. The rest of the region was found to be uncorrelated. Regions that correlate with higher significance tend to have a steeper spectrum, as is expected for free-free emission. Averaging over all correlated regions yields dust-correlation coefficients of $180\pm47$ and $123\pm16$ $\mu$K /MJy sr$^{-1}$ at 10 and 15 GHz respectively. These numbers however have large systematic uncertainties that we have identified and care should be taken when comparing with results from other experiments. We do find evidence for synchrotron emission with spectral index steepening from radio to microwave frequencies, but we cannot make conclusive claims about the origin of the dust-correlated component based on the spectral index estimates. Data with higher sensitivity are required to decide about the significance of the dust-correlation at high Galactic latitudes and other Galactic templates, in particular H$_\alpha$ maps, will be necessary for constraining its origin.

Inflationary constraints on cosmological field theory

We consider a non-singular scalar field cosmology proposed by Starkovich & Cooperstock, in which the matter- and radiation-dominated eras are preceded by a ‘prematter’ era characterized by negative pressure and rapid inflation. The form of the scalar potential during this period is of approximately power-law form, and is consistent with COBE and Tenerife data on the spectral index of density perturbations. However, the predicted density contrast is considerably larger than that observed. The theory also violates constraints on the energy at the end of inflation. Prospects for addressing these difficulties are briefly discussed.

Cross-Correlation of Tenerife Data with Galactic Templates-Evidence for Spinning Dust?

The recent discovery of dust-correlated diffuse microwave emission has prompted two rival explanations: free-free emission and spinning dust grains. We present new detections of this component at 10 and 15 GHz by the switched-beam Tenerife experiment. The data show a turnover in the spectrum and thereby support the spinning dust hypothesis. We also present a significant detection of synchrotron radiation at 10 GHz, which is useful for normalizing foreground contamination of cosmic microwave background experiments at high galactic latitudes.

A multifrequency maximum-entropy joint analysis of COBE and Tenerife data

AB S TRACT We use data from the Tenerife 10-, 15and 33-GHz beam-switching experiments along with the COBE 53and 90-GHz data to separate the cosmic microwave background (CMB) signal from the Galactic signal, and create two maps at high Galactic latitude. The new multi-MEM technique is used to obtain the best reconstruction of the two channels. The two maps are presented, and known features are identified within each. We find that the Galactic contribution to both the 15and 33-GHz Tenerife data is small enough to be ignored when compared with the errors in the data and the magnitude of the CMB signal.

Comments on the Comparison of the COBE DMR and Tenerife Data

Comments on the Comparison of the COBE DMR and Tenerife Data

Comparison of the COBE DMR and Tenerife Data

We have compared the Tenerife data with the COBEDifferential Microwave Radiometer (DMR) 2 year data in the declination+40 region of the sky observed by the Tenerife experiment. Using theGalactic plane signal at 30 GHz, we show that the two data sets arecross-calibrated to within 5 percent. The high Galactic latitude datawere investigated for the presence of common structures with theproperties of cosmic microwave background (CMB) fluctuations. The mostprominent feature in the Tenerife data (AT 80 muK) appears to be presentin both the 53 and 90 GHz DMR maps and has the Planckian spectrumexpected for CMB anisotropy. The cross-correlation function of theTenerife and DMR scans is indicative of common structure and at zero laghas the value C(0)112=34+1153 muK. The combination of the spatial andspectral information from the two data sets is consistent with thepresence of cosmic microwave background anisotropies common to both. Theprobability that noise could produce the observed agreement is less than5 percent.