Observations of the 18-cm lines of OH in comets with the Nançay radio telescope

Details Observations of the 18-cm lines of OH in comets with the Nançay radio telescope Observations of the 18-cm lines of OH in comets with the Nançay radio telescope

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..837c&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.837

Physics

Scientific paper

We present a progress report on the observations of comets with the Nançay radio telescope. The lines of OH at 18-cm wavelength have been systematically observed in comets at Nançay since 1973 [1]. These observations allow us to evaluate the cometary water production rate and its evolution with time, and to study several physical processes such as the excitation mechanisms of the OH radio lines, the expansion of cometary atmospheres, their anisotropy in relation with non-gravitational forces, the Zeeman effect in relation to the cometary magnetic field. Between 1973 and 1999, 52 comets have been successfully observed at Nançay. The radio telescope has been upgraded in 2000, and observations are now made with a sensitivity increased by about a factor of two. As of mid 2011, the returns of 53 comets were observed at Nançay with the refurbished instrument.

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