Bibcode
Tibbs, Christopher T.; Watson, Robert A.; Dickinson, Clive; Davies, Rodney D.; Davis, Richard J.; Buckmaster, Simon; Del Burgo, C.; Franzen, Thomas M. O.; Génova-Santos, R.; Grainge, Keith; Hobson, Michael P.; Padilla-Torres, C. P.; Rebolo, R.; Rubiño-Martín, J. A.; Saunders, Richard D. E.; Scaife, Anna M. M.; Scott, Paul F.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 3, pp. 1969-1979.
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3
2010
Citations
46
Refereed citations
43
Description
The dust complex G159.6-18.5 in the Perseus region has previously been
observed with the COSMOSOMAS experiment on angular scales of ~1°,
and was found to exhibit anomalous microwave emission. We present the
first high angular resolution observations of this dust complex,
performed with the Very Small Array (VSA) at 33GHz, to help increase the
understanding of the nature of this anomalous emission.
On the angular scales observed with the VSA (~10-40arcmin), G159.6-18.5
consists of five distinct components, all of which are found to exhibit
an excess of emission at 33GHz that is highly correlated with
far-infrared emission. Within the region, we find a range of physical
conditions: one of the features, which is associated with the reflection
nebula IC 348, has a dust emissivity comparable to that of HII regions,
while the other four features have values in agreement with previous
observations of intermediate Galactic latitudes. We provide evidence
that all of these compact components have anomalous emission that is
consistent with electric dipole emission from very small, rapidly
rotating dust grains. We find that these five components contribute ~10
per cent to the flux density of the diffuse extended emission detected
by COSMOSOMAS, implying that the bulk of the anomalous emission in
Perseus is diffuse and not concentrated in these compact components.
Related projects
Anisotropy of the Cosmic Microwave Background
The general goal of this project is to determine and characterize the spatial and spectral variations in the temperature and polarisation of the Cosmic Microwave Background in angular scales from several arcminutes to several degrees. The primordial matter density fluctuations which originated the structure in the matter distribution of the present
Rafael
Rebolo López