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.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 3, pp. 1969-1979.
Fecha de publicación:
3
2010
Número de citas
46
Número de citas referidas
43
Descripción
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.
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