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Phenomenology of radio sources |
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The Planck satellite will measure the whole sky at high radio frequencies
(or, in other words, at millimetre wavelengths). This way we get a catalog
of all possible radio sources in the sky! So far all full-sky surveys like this
have been at lower frequencies only. With the new high frequency Planck
survey we can study the general radio properties of the sources, or
concentrate on the behaviour of particular classes of sources. The aims of the
project are the reduction of the data and the search and set up of
source samples. The other radio sources related projects will directly benefit
from this groundwork.
Planck will measure the spectrum, polarization, and variability of each source
at several frequencies, and these will be combined with the data gathered
before the launch. We also need accurate positions and redshifts for them all.
The sources will then be classified according the their properties; whether
they are quasars (high or low polarization quasars, BL Lac objects,
GPS sources, etc.), radio galaxies, or something else. Finding altogether new
and exciting sources is possible!
Click figure to see a larger version
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Figure: D.L. Bertsch (NASA/GSFC) |
A lot of preparatory work is needed for a successful satellite mission.
We are currently observing sources for the Planck pre-launch catalog at
observatories all over the world and also with other satellites.
Our group is using the Metsähovi radio antenna as well as participating
in international efforts. We also need to develop methods for extracting
point sources from the satellite data stream, and for straightforward
portrayal of the differant source classes and their variability.
Besides this, we will also be helping the cosmologists to clean the CMB
maps effectively and to get more precise results!
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