Physical Conditions in the Narrow-Line Region of Markarian 3. II. Photoionization Modeling Results - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: We have examined the physical conditions in the narrow-line region NLR ofthe Seyfert 2 galaxy Markarian 3, using long-slit spectra obtained with theHubble Space Telescope-Space Telescope Imaging Spectrograph and photoionizationmodels. We find three components of photoionized gas in the NLR. Two of thesecomponents, characterized by emission lines such as NeV 3426 and OIII 5007,lie within the envelope of the bi-conical region described in our previouskinematic study. A component of lower ionization gas, in which lines such asOII 3727 arise, is found to lie outside the bi-cone. Each of these componentsis irradiated by a power-law continuum which is attenuated by intervening gas,presumably closer to the central source. The radiation incident upon the lowionization gas, external to the bi-cone, is much more heavily absorbed. Theseabsorbers are similar to the intrinsic UV and X-ray absorbers detected in manySeyfert 1 galaxies, which suggests that the collimation of the ionizingradiation occurs in a circumnuclear wind, rather than a thick, molecular torus.We estimate the mass for the observed NLR emitting gas to be 2 millionsolar-masses. It is likely that Markarian 3 acquired this gas through anon-going interaction with the spiral galaxy UGC 3422.



Author: Nicholas R. Collins, Steven B. Kraemer, D. Michael Crenshaw, Frederick C. Bruhweiler, Marcio Mélendez

Source: https://arxiv.org/







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