Oral Presentation
ALMA view of the central region of NGC 613
Presenter: Yusuke Miyamoto (Nobeyama Radio Observatory)
For understanding activity and evolution of active galactic nuclei (AGN), it is essential to investigate the fueling and feedback processes in AGN. Recent observations have showed that jet/outflow activities from AGNs can heavily influence the fueling process. A nearby Seyfert galaxy NGC 613 is one of the best targets for studying the jet/outflow activities due to the proximity, relatively abundant molecular gas around the center, the activity shown by the radio jet and the nuclear ring with moderate inclination.
We carried out observations of NGC 613 in Band3 and Band7 with ALMA. Using the archival 4.9 GHz data and our 95 GHz data, the spectral indices of -0.7 and -0.2 were derived along the jet and in the star forming ring, which can be produced by synchrotron emission and free-free emission, respectively. In addition, CO(3-2), HCN(1-0), HCN(4-3), HCO$^+$(1-0), HCO$^+$(4-3), CS(2-1) and CS(7-6) emission was detected from both the circum-nuclear disk (CND) and the ring. We found that the rotational temperature derived from the HCN, HCO+ and CS lines decreased with distance from the center and the ratios of HCN/HCO$^+$ and HCN/CS at the CND were consistent with those of other AGNs already reported.
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