Bibcode
López-Corredoira, Martín
Referencia bibliográfica
Astronomy and Astrophysics, v.346, p.369-382 (1999)
Fecha de publicación:
6
1999
Revista
Número de citas
5
Número de citas referidas
4
Descripción
New calculations of the Galactic contamination over microwave background
radiation anisotropies are carried out. On the one hand, when a
frequency-dependent contrast of molecular clouds with respect to the
Galactic background of the diffuse interstellar medium is taken into
account, the anisotropic amplitude produced by Galactic dust is
increased with respect to previous calculations and this is of the same
order as that of the data from the observations. On the other hand, if
we take into account rotational dust emission, for instance, a frequency
independence of anisotropies in the microwave range may be obtained.
This leads to the possibility that under some particular, but not
impossible, conditions all the microwave background radiation
anisotropies may be due to Galactic foregrounds rather than cosmological
in origin. Moreover, a suspected coincidence between the typical angular
sizes of the microwave background radiation anisotropies and those of
nearby molecular clouds makes more plausible the hypothesis of a purely
Galactic origin for these anisotropies. It is also argued that the
correlation among structures at different frequencies, the comparison of
the power spectrum at different frequencies and the galactic latitude
dependence of the anisotropies are not yet proofs in favour of either a
cosmological or Galactic origin.