CO Survey of a Distance-limited Seyfert Sample. I. The Data

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Abstract

We present the data of 12CO (J = 1–0) observations of the central regions of a sample of 43 nearby Seyfert galaxies (cz ≤ 5000 km s-1) with the NRO 45 m telescope. The general properties of this sample are also discussed, but a more detailed analysis is deferred to Paper II. The CO detection rate of this sample (i.e., almost 50%) is comparable to that of other spiral galaxy surveys in similar redshift ranges made with that telescope. There seems to be no difference in the detection rates of Seyfert galaxies types 1 and 2. Since we observed a single point centered at the nucleus, and the average ratio of the beam HPBW of the 45 m telescope to the apparent optical diameter of these objects was 0.13, only a small fraction of the total molecular gas is recovered. However, a clear correlation of the CO contents with the IRAS FIR luminosities is also seen, and there seems to be a tendency for Seyfert galaxies to be closer to normal galaxies than to starbursts. The radial distribution of the molecular gas in these galaxies is compatible in most cases with a steeply decreasing function.

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