| Autor: |
Krips, M., Neri, R., García-Burillo, S., Combes, F., Schinnerer, E., Baker, A. J., Eckart, A., Boone, F., Hunt, L., Leon, S., Tacconi, L. J., Krips, M., Neri, R., García-Burillo, S., Combes, F., Schinnerer, E., Baker, A. J., Eckart, A., Boone, F., Hunt, L., Leon, S., Tacconi, L. J. |
| Zdroj: |
Astronomy and Astrophysics; June 2007, Vol. 468 Issue: 3 pL63-L66, 4p |
| Abstrakt: |
Context.Several studies of nearby active galaxies indicate significantly higher HCN-to-CO intensity ratios in AGN (e.g., NGC 1068) than in starburst (e.g., M 82) environments. HCN enhancement can be caused by many different effects, such as higher gas densities and/or temperatures, UV/X-ray radiation, and non-collisional excitation. As active galaxies often exhibit intense circumnuclear star formation, high angular resolution/high sensitivity observations are of paramount importance to disentangling the influence of star formation from that of nuclear activity on the chemistry of the surrounding molecular gas. The tight relation of HCN enhancement and nuclear activity may qualify HCN as an ideal tracer of molecular gas close to the AGN, providing complementary and additional information to that gained via CO. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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