The flux ratio of the [N II]λλ 6548, 6583&nbsp;Å lines in sample of Active Galactic Nuclei Type 2

Dojčinović, Ivan; Kovačević-Dojčinović, Jelena; Popović, Luka Č.

doi:10.1016/j.asr.2022.04.041

The flux ratio of the [N II] λλ 6548, 6583 Å lines in sample of Active Galactic Nuclei Type 2

Journal Article · Mon Apr 25 00:00:00 EDT 2022 · Advances in Space Research

DOI:https://doi.org/10.1016/j.asr.2022.04.041· OSTI ID:2425331

Dojčinović, Ivan ^[1]; Kovačević-Dojčinović, Jelena ^[2]; Popović, Luka Č. ^[3]

Univ. of Belgrade (Serbia)
Astronomical Observatory, Belgrade (Serbia)
Astronomical Observatory, Belgrade (Serbia); Univ. of Belgrade (Serbia)

In spectra of the Active Galactic Nuclei (AGNs), the [N II]λλ 6548, 6583 Å lines are commonly fitted using the fixed intensity ratio of these two lines (R_[NII] = I₆₅₈₃/I₆₅₄₈). However, the used values for fixed intensity ratio are slightly different through literature. There are several theoretical calculations of the transition probabilities which can be used for the line ratio estimation, but there are no experimental measurements of this ratio, since the [N II] lines are extremely weak in laboratory plasma. Therefore, the intensity ratio of [N II] lines can be measured only in the spectra of astrophysical objects. However, precise and systematic measurements have not be done so far, because of difficulties in measurement of the [N II] ratio in various spectra (overlapping with Hα, weak intensity of [N II], influence of the continuum noise and outflow contribution, etc.). Here we present the measurements of the flux ratio of the [N II] λλ 6548, 6583 Å emission lines for a sample of 250 Type 2 AGNs spectra taken form Sloan Digital Sky Survey (SDSS) data base. Further, the spectra are chosen to have high signal-to-noise ratio and to [N II] and Hα lines do not overlap. The obtained mean flux ratio from measurements is 3.049 ± 0.021. Our result is in agreement with theoretical result obtained by taking into account the relativistic corrections to the magnetic dipole operator.

View Accepted Manuscript (DOE)

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

OSTI ID:: 2425331

Alternate ID(s):: OSTI ID: 1961093

Journal Information:: Advances in Space Research, Journal Name: Advances in Space Research Journal Issue: 2 Vol. 71; ISSN 0273-1177

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The flux ratio of the [N II] λλ 6548, 6583 Å lines in sample of Active Galactic Nuclei Type 2

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