NGC 4151: Radio Morphology on the Sub-Parsec-Scale

Details NGC 4151: Radio Morphology on the Sub-Parsec-Scale NGC 4151: Radio Morphology on the Sub-Parsec-Scale

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.5006w&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #50.06; Bulletin of the American Astronomical Society, Vol. 33, p.1374

Astronomy and Astrophysics

Astronomy

Scientific paper

The VLBA and phased-VLA were used to image Seyfert galaxy NGC 4151 at wavelengths of 3.6 and 6 cm, achieving resolutions of ~2 and 3 mas (0.16 and 0.24 pc) respectively. This marks the first time that this Seyfert has been imaged at 3.6 cm with VLBI. At both wavelengths, two components (previously denoted as D and E) were identified. The brightness temperatures ( 107-108 K) we calculated were consistent with non-thermal emission from D and E. There is no evidence for extended emission of a lower brightness temperature that might be associated with a nuclear torus. The spectral indices of the components and their subcomponents reveal no obvious flat-spectrum source, so the question of whether the nucleus is in component D or E remains unanswered. This is the second time that NGC 4151 has been imaged by the VLBA at 6 cm, enabling derivation of a tentative speed limit of <= 0.07c on the parsec scale motion of component E with respect to component D. NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Further support for D. S. Wong was provided by NSERC of Canada.

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