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We have conducted a high-resolution ``3D'' imaging survey of the CO(1--0),HCN(1--0), and HCO$^+$(1--0) lines toward the central a few kpc regions of theSeyfert and starburst galaxies in the local universe using the NobeyamaMillimeter Array. We detected luminous HCN(1--0) emissions toward aconsiderable fraction of these Seyfert galaxies (10 of 12 in our sub-sample),which indicated that some of these Seyfert galaxies, such as NGC 3079, NGC3227, NGC 4051, NGC 6764, and NGC 7479, are indeed accompanied with compactnuclear starburst, given the tight correlation between the HCN(1--0) luminosityand the star formation rate among star-forming galaxies. However, we suggestthat the elevated HCN(1--0) emission from some of these Seyfert galaxies,including NGC 1068, NGC 1097, NGC 5033, and NGC 5194, does not signify thepresence of massive starbursts there. This is because these Seyfert nuclei showabnormally high HCN(1--0)/HCO$^+$(1--0) ratios (2--3), which were neverobserved in the starburst nuclei in our sample. This could be attributed to theoverabundance of HCN molecules in the X-ray dominated regions (XDRs) at thecenters of these Seyfert galaxies.

Compact starburst in the central regions of Seyfert galaxies