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We conducted millimeter continuum observations for samples of nearbyearly-type galaxies (21 sources) and nearby low-luminosity active galacticnuclei (LLAGN; 16 sources) at 100 GHz (3 mm) using the Nobeyama MillimeterArray (NMA). In addition, we performed quasi-simultaneous observations at 150GHz (2 mm) and 100 GHz for five LLAGNs. Compact nuclear emissions showing flator inverted spectra at centimeter-to-millimeter wavelengths were found in manyLLAGNs and several early-type galaxies. Moreover, significant flux variabilitywas detected in three LLAGNs. These radio properties are similar to Sgr A*. Theobserved radio luminosities are consistent with the fundamental plane of blackhole activity that has suggested on the basis of samples with black hole massesranging from 10 to 10^10 M_sun. This implies nuclear jets powered byradiatively inefficient accretion flows onto black holes.

the astronomical journal

Millimeter Radio Continuum Emissions as the Activity of Super Massive  Black Holes in Nearby Early-Type Galaxies and Low-Luminosity Active Galactic  Nuclei