Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 55, Issue 1, Pages L1-L5Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/55.1.L1
Keywords
galaxies : active; galaxies : individual (NGC 1097); galaxies : ISM; galaxies : Seyfert; galaxies : starburst
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The central kpc region of the low-luminosity type-1 Seyfert galaxy NGC 1097 has been observed in the CO (1-0) and HCN (1-0) lines with the Nobeyama Millimeter Array and the NRO 45 m telescope. We have found a striking enhancement of the HCN emission toward the active nucleus of NGC 1097; a large fraction of the CO emission comes from a circumnuclear starburst ring (r similar to 10 or 700 pc at D = 14.5 Mpc), whereas the HCN emission is dominated by a strong unresolved peak at the nucleus. The HCN-to-CO integrated intensity ratio on the brightness temperature scale, R-HCN/CO, is about 0.11 in the aperture of the 45 m telescope beams (15 for CO and 19 for HCN), but reaches 0.34 in the smaller aperture (10 x 4.4). These CO and HCN properties in NGC 1097 are similar to those in the type-2 Seyfert galaxies NGC 1068 and NGC 5194 (M 5 1).
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