A Hidden Nucleus in Cygnus A, but Not in M87

Details A Hidden Nucleus in Cygnus A, but Not in M87 A Hidden Nucleus in Cygnus A, but Not in M87

2001-06-21

arxiv.org/abs/astro-ph/0106381v1

Astronomy and Astrophysics

Astrophysics

18 pages, 3 figures. Submitted to Astrophysical Journal Letters

Scientific paper

Historically the narrow line radio galaxies were thought to be intrinsically nonthermal, and without significant accretion. When the Unified Model came along the compelling observational motivation for this lost some force: some are found to be hidden broad line objects, and in principle that could be the case with all of them. The clear sign of a hidden quasar is a normal quasar spectrum in polarized (scattered) light. However that test requires a suitably placed "mirror." A more robust test is the high predicted mid-IR core luminosity reradiating from the obscuring matter. Cygnus A has this component, but M87 does not.

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