Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..725i&link_type=abstract
Publications of the Astronomical Society of Japan, v.47, p.725-737.
Astronomy and Astrophysics
Astronomy
27
Galaxies: Active, Galaxies: Magnetic Fields, Polarization, Radio Sources
Scientific paper
Multi-channel polarimetry has been performed to detect high rotation measure (RM) at 3 cm using the Nobeyama 45-m telescope. The high RM candidates of 96 radio sources were selected to be observed, and RMs of 35 sources were derived from the observations. Since the four channels are set contiguously from 2.84 cm to 3.31 cm, |RM| can be derived uniquely up to 15000 rad m(-2) by this polarimeter. We found that there exist sources with RM of several thousands rad m(-2) . In fact, 5 sources have |RM| > 1000 rad m(-2) . On the other hand, all sources observed are well within this system limits, and therefore we suggest the observed upper limit of |RM| is around 5000 rad m(-2) for extragalactic radio sources, even taken into account the redshift of sources.
Aizu K.
Inoue Makoto
Kato Taichi
Tabara Hiroto
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