Follow-up of unusual real-time and ERCSC objects with Herschel



Herschel satellite Herschel, which operates at infrared frequencies, will be launched together with the Planck satellite. Planck will provide us with a full-sky survey of thousands of dusty active galaxies that are suitable for follow-up observations with Herschel. The purpose of the project is to identify interesting sources measured by Planck, and then quickly observe them with Herschel, too.

Infrared observations combined with radio obsevations help to construct more complete spectra as well as pin down the exact position and flux of the sources. From spectral lines we can determine the temperature and density of interstellar matter in galaxies. In addition, we can use Herschel observations in studying radio-loud active galaxies, for example quasars (see science programme on The astrophysics of quasars and BL Lac objects) or GPS sources (see science programme on Extreme GPS and other strongly inverted spectrum radio sources ).

Preliminary Herschel proposals have been reviewed by the Planck Science Team in 2006, and the two proposals from Metsähovi ("Target of Opportunity Herschel observations of interesting active galactic nuclei detected with the Planck Quick Detection System" and "Observing submm bright active galactic nuclei with Herschel") have been approved for further processing.

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