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researcher

R. Riffel

6 papers hereh-index 18 citations4 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • middle author4

Across the 4 of 6 papers where every author was matched, so the position is known.

fields
  • astro-ph.GA5
  • astro-ph.HE1
same name
  • R. Riffel — 141 papers, h 32
  • R. Riffel — 88 papers, h 15
  • R. Riffel — 71 papers, h 25
  • R. Riffel — 61 papers, h 31
  • R. Riffel — 15 papers, h 0
  • R. Riffel — 6 papers, h 1

Either other researchers who publish under this name, or the same person where the external sources have not merged their records.

identity via Semantic Scholar / OpenAlex

most citedDirect estimates of nitrogen abundance for Seyfert 2 nuclei

1 citations · 2 across the 6 of their papers we have counts for

collaborators
Showing astro-ph.GAShow all

3 papers · 1 filter

astro-ph.GA2025

Metallicity of Active Galactic Nuclei from ultraviolet and optical emission lines-II. Revisiting the C43 metallicity calibration and its implications

O. L. Dors, C. B. Oliveira, M. V. Cardaci +7

In this study, a new semi-empirical calibration is proposed between ultraviolet emission lines (\ion{C}{iii}]λ1909, \ion{C}{iv}λ1549, \ion{He}{ii}]λ1640) of…

astro-ph.GA2025

Metallicity of Active Galactic Nuclei from ultraviolet and optical emission lines I: Carbon abundance dependence

O. L. Dors, C. B. Oliveira, M. V. Cardaci +9

Metallicity (Z) estimates based on ultraviolet (UV) emission lines from the narrow-line regions (NLRs) of active galactic nuclei (AGNs) have been found to differ from those deriv…

astro-ph.GA2024★ 1 cited

Direct estimates of nitrogen abundance for Seyfert 2 nuclei

O. L. Dors, M. V. Cardaci, G. F. Hägele +10

We derive the nitrogen and oxygen abundances in the Narrow Line Regions (NLRs) of a sample of 38 local (z<0.4) Seyfert~2 nuclei. For that, we consider narrow optical emis…

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Not affiliated with arXiv. Researcher data from Semantic Scholar (ODC-BY) and OpenAlex.