Issue |
A&A
Volume 529, May 2011
|
|
---|---|---|
Article Number | A154 | |
Number of page(s) | 5 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201116595 | |
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
1
MPIfR, Auf dem
Hügel 69, 53121
Bonn,
Germany
e-mail: ypao@mpifr-bonn.mpg.de
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
Received:
27
January
2011
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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