Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.5310g&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #53.10; Bulletin of the American Astronomical Society, Vol. 25, p.1376
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The bright radio source 3C84 is associated with the giant elliptical NGC 1275. An extensive X-ray halo surrounds NGC 1275, and the morphology indicates that the gas in the cluster core is cooling and accreting onto NGC 1275 (Fabian et al. 1981). NGC 1275 is surrounded by a unique system of Hα filaments. The central regions of NGC 1275 have broad emission lines and a compact optical continuum source. 3C84 is an example of a core dominated radio source. Most sources of this type are associated with quasars at high redshift. The optical and radio properties of 3C84 are more closely related to those of BL Lacertae objects. The relative proximity of 3C84 allows a detailed study of polarization to explore the magnetic field structure, thermal environment, and kinematics of this compact radio source. 3C84 has very low integrated polarization compared to most core-dominated sources, which typically show significant polarization on both arcsecond and milliarcsecond scales. This could be due to depolarization from a huge Faraday rotation in the hot cluster medium or the cold line emitting medium. We present recent VLA and VLBI observations of 3C84. The high dynamic range (200,000:1) VLA image of 3C84 was made at 3.6 cm in the spectral-line mode. Special calibration techniques were used to correct for the time variation of the VLA polarization response. These observations show that compact core is not polarized (less than 0.05%). 3C84 has been used as a VLBI polarization calibrator because of its low integrated polarization (Roberts, Wardle, & Brown 1994). We have reanalyzed our Mk III VLBI data using AIPS to search for very weak polarization on parsec scales. We found no polarization from any component (polarized flux less than 10 mJy). This work was supported by grants from the National Science Foundation to DHR.
Ge Jingping
Roberts David H.
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