Very high-resolution observations of the radio sources NRAO 150, OJ 287, 3C 273, M87, 1633+38, BL Lacertae, and 3C 454. 3
- National Radio Astronomy Observatory, Green Bank, WV
Very long baseline interferometer observations made at a wavelength of 2 and 2.8 cm with baselines ranging from 54 to 291 million wavelengths show a number of radio sources with only slightly resolved components, even on the longest baselines; the quasars 1633 + 38 and 3C 454.3, the objects OJ 287 and BL Lac, and the nucleus of M87 (Virgo A, 3C 274) all contain components < or approximately 0.4 milli-arcsec. The smallest component observed is in the core of 3C 454.3, which contains about 50% of the total flux density and is < or approximately 0.2 milli-arcsec in diameter. The compact component in the nucleus of M87 is < or approximately 1.5 light-months across, and contains about one-third of the total flux density of the nucleus at 2.8 cm. NRAO 150 and BL Lac are double: the components of NRAO 150 are separated by 0.6 milli-arcsec, while BL Lac has an elongated structure consisting of a large (1.4 milli-arcsec) component separated by 1.25 milli-arcsec from a smaller (0.5 milli-arcsec) variable one. The present data on 3C 273 are consistent with triple models similar to those discussed previously, but with a somewhat greater apparent separation of components.
- OSTI ID:
- 6719544
- Journal Information:
- Astrophys. J.; (United States), Vol. 211
- Country of Publication:
- United States
- Language:
- English
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