Resumen

BINETTE, Luc et al. Temperature Discrepancy with Photoionization Models of the Narrow-Line Region. Rev. mex. astron. astrofis [online]. 2022, vol.58, n.1, pp.133-153.  Epub 23-Ene-2023. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2022.58.01.11.

Using published work on the narrow-line region of active galactic nuclei, a comparison is carried out among the [O III] λ4363Å/λ5007Å (ROIII) ratio observed in quasars, Seyfert 2's and the spatially resolved ENLR plasma. Using the weak [Ar IV] λ4711Å/λ4740Å doublet ratio observed by Koski (1978) among Seyfert 2's, we find evidence of a narrow-line region (NLR) populated by low density emission clouds (≲ 104 cm-3). After considering calculations of the [Ar IV] and [O III] ratios that assume a power law distribution of plasma densities, no evidence of collisional deexcitation is found. The plasma temperature inferred is 13 500 °K, which is problematic to reproduce with standard photoionization calculations. The simplest interpretation for the near coincidence of the ROIII ratios among the ENLR and Seyfert 2 measurements (ROIII ≃ 0:017) is that the low density regime applies to both plasmas.

Palabras llave : dust; extinction; plasmas.

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