Observations of Ammonia in External Galaxies. II. Maffei 2

Abstract

The ammonia (J,K) = (1,1), (2,2), (3,3), and (4,4) transitions at 23.7 -- 24.1 GHz region were searched for in a nearby galaxy Maffei 2 to study relation between molecular abundances and physical conditions in galaxies. The (1,1), (2,2), and (3,3) emission lines were clearly detected. The rotational temperatures and ortho-to-para abundance ratios obtained are about 30 K and about 2.6, respectively. The abundance of NH3 relative to H2 in Maffei 2 was found to be the largest among galaxies where NH3 is already detected, and the abundance in Maffei 2 is more than an order of magnitude larger than the already reported upper limit in M82. Hence, we further confirmed the systematically peculiar molecular abundance in the aspect of formation mechanisms of molecules already reported in M82.

6 pages, 2 fugures

Cited by in corpus (12)

• Herschel/PACS spectroscopy of NGC 4418 and Arp 220: H2O, H2^{18}O, OH, ^{18}OH, O I, HCN and NH3
• The Temperature Distribution of Dense Molecular Gas in the Center of NGC 253
• Dense gas in nearby galaxies: XV. Hot ammonia in NGC253, Maffei2 and IC342
• CI and CO in the nearby spiral galaxies IC 342 and Maffei 2
• The kinetic temperature of a molecular cloud at redshift 0.7: Ammonia in the gravitational lens B0218+357
• CS, HC3N and CH3CCH multi-line analyses towards starburst galaxies. The evolution of cloud structures in the central regions of galaxies
• Ammonia Thermometry of Star Forming Galaxies
• Nuclear Bar Catalyzed Star Formation: 13^CO, C18^O and Molecular Gas Properties in the Nucleus of Maffei 2
• Dense Gas in Nearby Galaxies: XVII. The Distribution of Ammonia in NGC253, Maffei2 and IC342
• Shocked ammonia in the WR nebula NGC 2359
• NH3 in the Galactic Center is formed in Cool Conditions
• Water Masers in the Andromeda Galaxy: I. A Survey for Water Masers, Ammonia, and Hydrogen Recombination Lines