Journal
ASTRONOMICAL JOURNAL
Volume 142, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/142/5/167
Keywords
galaxies: active; galaxies: elliptical and lenticular, cD; galaxies: jets; radio continuum: galaxies; techniques: interferometric
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Funding
- Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) [18740107, 21540250]
- Center for the Promotion of Integrated Sciences (CPIS) of Sokendai
- Grants-in-Aid for Scientific Research [21540250, 23540268, 20001003, 18740107] Funding Source: KAKEN
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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 (lambda 3 mm) using the Nobeyama Millimeter Array (NMA). In addition, we performed quasi-simultaneous observations at 150 GHz (lambda 2 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 10(10) M-circle dot. This implies nuclear jets powered by radiatively inefficient accretion flows onto black holes.
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