Watson, R. A.; Rebolo, R.; Rubiño-Martín, J. A.; Hildebrandt, S.; Gutiérrez, C. M.; Fernández-Cerezo, S.; Hoyland, R. J.; Battistelli, E. S.
Referencia bibliográfica
The Astrophysical Journal, Volume 624, Issue 2, pp. L89-L92.
Fecha de publicación:
5
2005
Revista
Número de citas
143
Número de citas referidas
122
Descripción
We present direct evidence for anomalous microwave emission in the
Perseus molecular cloud, which shows a clear rising spectrum from 11 to
17 GHz in the data from the COSMOSOMAS experiment. By extending the
frequency coverage using W ilkinson Microwave Anisotropy Probe maps
convolved with the COSMOSOMAS scanning pattern, we reveal a peak flux
density of 42+/-4 Jy at 22 GHz integrated over an extended area of 1.65d
×1.0d centered on R.A.=55.4d+/-0.1d and decl.=+31.8d+/-0.1d
(J2000). The flux density that we measure at this frequency is nearly an
order of magnitude higher than can be explained in terms of normal
Galactic emission processes (synchrotron, free-free, and thermal dust).
An extended IRAS dust feature, G159.6-18.5, is found near this position,
and no bright unresolved source that could be an ultracompact H II
region or gigahertz-peaked source could be found. An adequate fit for
the spectral density distribution can be achieved from 10 to 50 GHz by
including a very significant contribution from electric dipole emission
from small spinning dust grains.