Gas Disks and Supermassive Black Holes in Nearby Radio Galaxies

dish flux density measurements at 1400 MHz). The source information is shown in
Table 2.1. The selection criteria result in a complete sample of nearby radio galaxies
with jets.
This complete sample was drawn from a catalog of 176 radio-loud galaxies con-
structed by Condon & Broderick (1988), by position coincidence of radio identifica-
tions in the Green Bank 1400 MHz sky maps and galaxies in the UGC catalog. All
of the galaxies fall into the Fanaroff & Riley (1974) Type-I (FR-I) radio classification
(see Xu et al., 2000, for a description of the radio properties of our sample); i.e. they
are low luminosity radio galaxies, with jets that are brightest nearest to the nucleus.
(In contrast, FR-II galaxies are more powerful radio sources, and have bright spots
at the far edges of their radio lobes, the only FR-II within 7000 km s −1 is the radio
galaxy Cen-A, which is in the southern sky.)
The combination of selecting extended sources and early type galaxies results in
the primary energy source of each galaxy in the sample falling into ‘monster’ rather
than ‘starburst’ classification of Condon & Broderick (1988) based on their infra-red
to radio flux ratios (for example, see Heckman et al., 1983)
u ≡ log
27
� �
S60µm
≪ 1.6, (2.1)
S1400MHz