http://arxiv.org/abs/1807.08953
Narrow-line Seyfert 1 galaxies (NLS1s) are a class of active galactic nuclei (AGN). Their physical properties can be either interpreted in terms of evolution, suggesting that they are a young phase of AGN life, or inclination, under the hypothesis of a disk-like broad-line region observed pole-on. To distinguish between these two hypotheses, host galaxy morphology is a very helpful tool because it can provide an independent estimate of the black hole mass. In this work we present the results of a morphological analysis of the host galaxy of the radio-loud NLS1 IRAS 20181-2244 observed with the 6.5m Baade Telescope of the Las Campanas Observatory. The GALFIT analysis ran on the Ks image, along with additional spectroscopic observations performed with the Nordic Optical Telescope, clearly revealed the presence of an interacting system of two disk galaxies. The presence of a disk hosting this NLS1 is supportive of the evolutionary hypothesis. This analysis, along with other results presented in the literature, might suggest that two subclasses of radio-loud NLS1 exist. One represents the young evolutionary phase of AGN life, and the other is observed pole-on. Further morphological studies are needed to discern between the two groups.
M. Berton, E. Congiu, S. Ciroi, et. al.
Wed, 25 Jul 18
44/60
Comments: 7 pages, 5 figures, 1 table, submitted to ApJ
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