NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-19 T17:48:10 PDT
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For refcode 2013MNRAS.430.2002R:
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NED Abstract

Copyright by Royal Astronomical Society. 2013MNRAS.430.2002R Molecular hydrogen and [Fe II] in active galactic nuclei - III. Low-ionization nuclear emission-line region and star-forming galaxies Riffel, R.; Rodriguez-Ardila, A.; Aleman, I.; Brotherton, M. S.; Pastoriza, M. G.; Bonatto, C.; Dors, O. L. Abstract. We study the kinematics and excitation mechanisms of H_2_ and [Fe II] lines in a sample of 67 emission-line galaxies with Infrared Telescope Facility SpeX near-infrared (0.8-2.4 micron) spectroscopy together with new photoionization models. H_2_ emission lines are systematically narrower than narrow-line region lines, suggesting that the two are, very likely, kinematically disconnected. The new models and emission-line ratios show that the thermal excitation plays an important role not only in active galactic nuclei but also in star-forming galaxies. The importance of the thermal excitation in star-forming galaxies may be associated with the presence of supernova remnants close to the region emitting H_2_ lines. This hypothesis is further supported by the similarity between vibrational and rotational temperatures of H_2_. We confirm that the diagram involving the line ratios H_2_ 2.121 micron/Brgamma and [Fe II] 1.257 micron/Pabeta is an efficient tool for separating emission-line objects according to their dominant types of activities. We suggest new limits to the line ratios in order to discriminate between the different types of nuclear activities. Key words: line: formation, molecular processes, galaxies: Seyfert, infrared: galaxies
Retrieve 45 NED objects in this reference.
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