Detection of a nuclear radio source in NGC 7331: A relatively 'radio-quiet' liner

Details Detection of a nuclear radio source in NGC 7331: A relatively 'radio-quiet' liner Detection of a nuclear radio source in NGC 7331: A relatively 'radio-quiet' liner

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l.139c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 2, p. L139-L142

Astronomy and Astrophysics

Astronomy

23

Active Galactic Nuclei, Black Holes (Astronomy), Light (Visible Radiation), Optical Emission Spectroscopy, Radio Sources (Astronomy), Spiral Galaxies, Supernovae, Astronomical Coordinates, Radio Emission, Spectral Emission, Very Large Array (Vla), Wavelengths

Scientific paper

We have used the Very Large Array (VLA) to observe the nearby spiral galaxy NGC 7331. The observations detected and unresolved radio source in the nucleus of this galaxy, with flux densities of 234 +/- 25 micro Jy and 121 +/- 16 micro Jy at 20 and 6 cm, respectively. This is equivalent (at the distance of this galaxy) to luminosities of approximately 3 and 4 times that of the Galactic center source Sgr A at 20 and 6 cm. The source in NGC 7331, with a radio spectral index (Snu proportional to nualpha) of alpha = -0.6 +/- 0.1, sits in a region of very low gas density, surrounded by a ring of radio emission. Optical spectra show that NGC 7331 has a weak low-ionization nuclear emission region (LINER) nucleus. We compare the radio and optical properties of this nucleus with other LINER nuclei detected in the radio, and find that NGC 7331 has an unusually low radio to H alpha flux ratio. The combination of an unresolved radio source and a LINER nucleus spectrum suggests that this galaxy harbors a massive black hole. The radio observations of NGC 7331 did not detect emission from the historical supernova 1959D with a 3 sigma upper limit of 75 micro Jy at 20 cm.

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