<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Rogério Riffel |</title><link>https://mrkrmh.github.io/authors/rogerio-riffel/</link><atom:link href="https://mrkrmh.github.io/authors/rogerio-riffel/index.xml" rel="self" type="application/rss+xml"/><description>Rogério Riffel</description><generator>HugoBlox Kit (https://hugoblox.com)</generator><language>en-us</language><lastBuildDate>Sun, 01 Mar 2026 00:00:00 +0000</lastBuildDate><item><title>Identifying AGNs from X-ray detections-I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter</title><link>https://mrkrmh.github.io/publication/2026-mnras-tmp-531-a/</link><pubDate>Sun, 01 Mar 2026 00:00:00 +0000</pubDate><guid>https://mrkrmh.github.io/publication/2026-mnras-tmp-531-a/</guid><description/></item><item><title>Spatially resolved gas-phase metallicity in Seyfert galaxies</title><link>https://mrkrmh.github.io/publication/2024-mnras-534-2723-a/</link><pubDate>Fri, 01 Nov 2024 00:00:00 +0000</pubDate><guid>https://mrkrmh.github.io/publication/2024-mnras-534-2723-a/</guid><description/></item><item><title>Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity-luminosity relation</title><link>https://mrkrmh.github.io/publication/2023-mnras-520-1687-a/</link><pubDate>Sat, 01 Apr 2023 00:00:00 +0000</pubDate><guid>https://mrkrmh.github.io/publication/2023-mnras-520-1687-a/</guid><description/></item><item><title>Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal-poor accretion</title><link>https://mrkrmh.github.io/publication/2022-mnras-513-807-d/</link><pubDate>Wed, 01 Jun 2022 00:00:00 +0000</pubDate><guid>https://mrkrmh.github.io/publication/2022-mnras-513-807-d/</guid><description/></item></channel></rss>