Volume 529, May 2011
|Number of page(s)||5|
|Published online||22 April 2011|
Ammonia (J,K)=(1,1) to (4,4) and (6,6) inversion lines detected in the Seyfert 2 galaxy NGC 1068
MPIfR, Auf dem
Hügel 69, 53121
2 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, PR China
3 National Radio Astronomy Observatory, 520 Edgemont Rd., Charlottesville, VA 22903, USA
4 Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands
Accepted: 21 March 2011
We present the detection of the ammonia (NH3) (J,K)=(1,1) to (4,4) and (6,6) inversion lines toward the prototypical Seyfert 2 galaxy NGC 1068, made with the Green Bank Telescope (GBT). This is the first detection of ammonia in a Seyfert galaxy. The ortho-to-para-NH3 abundance ratio suggests that the molecule was formed in a warm medium of at least 20K. For the NH3 column density and fractional abundance, we find (1.09 ± 0.23) × 1014 cm-2 and (2.9 ± 0.6) × 10-8, respectively, from the inner ~1.2 kpc of NGC 1068. The kinetic temperature can be constrained to 80 ± 20 K for the bulk of the molecular gas, while some fraction has an even higher temperature of 140 ± 30 K.
Key words: galaxies: individual: NGC 1068 / galaxies: Seyfert / galaxies: ISM / ISM: molecules / radio lines: galaxies
© ESO, 2011
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