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| Paper: |
X-ray Irradiated Dense Molecular Medium in the Active Nucleus of NGC 1097 |
| Volume: |
476, New Trends in Radio Astronomy in the ALMA Era |
| Page: |
309 |
| Authors: |
Izumi, T.; Kohno, K.; Martín, S.; Sheth, K.; Matsushita, S.; Espada, D.; NGC 1097 collaborators |
| Abstract: |
We have conducted an observation towards the nucleus of a type-1 Seyfert, NGC 1097
in ALMA Cycle 0 with Band 7.
The results of this observations are summarized as follows:
(1) No vibrationally excited HCN emission has been detected. This indicates that the IR pumping is not the cause of HCN enhancement in this galaxy.
(2) We found an extremely high HCN(J=4-3) to CS(J=7-6) line ratio, which is over 10.
A similar ratio (∼ 10) was also found in NGC 1068 (AGN).
However, such high ratios have never been observed in starburst galaxies and Galactic star-forming regions.
Therefore, we regard this line ratio as an effective discriminator between AGN and starburst activity. |
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