Millimeter Radio Continuum Emissions as the Activity of Supermassive Black Holes in Nearby Early-type Galaxies and Low-luminosity Active Galactic Nuclei

We conducted millimeter continuum observations for samples of nearby early-type galaxies (21 sources) and nearby low-luminosity active galactic nuclei (LLAGNs; 16 sources) at 100 GHz ( Delta *l3 mm) using the Nobeyama Millimeter Array (NMA). In addition, we performed quasi-simultaneous observations...

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Bibliographic Details
Published in:	The Astronomical journal 2011-11, Vol.142 (5), p.167-jQuery1323896881614='48'
Main Authors:	Doi, Akihiro, Nakanishi, Kouichiro, Nagai, Hiroshi, Kohno, Kotaro, Kameno, Seiji
Format:	Article
Language:	eng
Subjects:	ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY BLACK HOLES EMISSION SPECTRA GALAXIES GALAXY NUCLEI GHZ RANGE JETS LUMINOSITY MASS PHOTON EMISSION
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Summary:	We conducted millimeter continuum observations for samples of nearby early-type galaxies (21 sources) and nearby low-luminosity active galactic nuclei (LLAGNs; 16 sources) at 100 GHz ( Delta l3 mm) using the Nobeyama Millimeter Array (NMA). In addition, we performed quasi-simultaneous observations at 150 GHz ( Delta l2 mm) and 100 GHz for five LLAGNs. Compact nuclear emissions showing flat or inverted spectra at centimeter-to-millimeter wavelengths were found in many LLAGNs and several early-type galaxies. Moreover, significant flux variability was detected in three LLAGNs. These radio properties are similar to Sgr A*. The observed radio luminosities are consistent with the fundamental plane of black hole activity that was suggested on the basis of samples with black hole masses ranging from 10 to 1010 M . This implies nuclear jets powered by radiatively inefficient accretion flows onto black holes.
ISSN:	1538-3881 0004-6256 1538-3881