Extreme line profile variations in the repeating changing-look active galactic nucleus IRAS23226-3843
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2026
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| author | Kollatschny, Wolfram Grupe, Dirk Winkler, Hartmut Probst, Malte A. Ochmann, Martin W. Poenitzsch, Amon Schartel, Norbert Wolsing, Salem Komossa, Stefanie Potter, Stephen B. |
| author_facet | Kollatschny, Wolfram Grupe, Dirk Winkler, Hartmut Probst, Malte A. Ochmann, Martin W. Poenitzsch, Amon Schartel, Norbert Wolsing, Salem Komossa, Stefanie Potter, Stephen B. |
| contents | IRAS23226-3843 has been identified as a highly variable Seyfert galaxy and even as a changing-look active galactic nucleus based on optical spectra. Here we present follow-up observations - taken over the past five years - for examining the ongoing photometric and spectral variations in this remarkable galaxy. We carried out SWIFT observations of IRAS23226-3843 together with new optical spectra taken in 2023 and 2024. In parallel we investigate ASAS-SN photometric data from 2014 till 2025. IRAS23226-3843 stayed on a high continuum flux level in the X-ray as well as in the optical since a historic outburst in 2019. However, it shows strong short-term variations on timescales of a few months. Densely sampled ASAS-SN V-band continuum data from 2014 till 2025 confirm that behavior. IRAS23226-3843 switched from a clear Seyfert 1 type in December 2019 to a Seyfert 1.9/2 type in July 2020 based on its optical spectra. Afterward, it again became a Seyfert 1 type with symmetric broad single-peaked Balmer line profiles in January 2023. These spectra prove the repeating changing-look character of the galaxy.IRAS23226-3843 exhibits extreme high Balmer decrements Ha\Hb based on their broad line components. The Balmer decrement values are on the order of 10. IRAS23226-3843 successively showed all types of broad line Balmer profiles during the past 25 years over periods of many years: asymmetric single-peaked, double-peaked, as well as single-peaked and symmetric profiles in addition to its Seyfert 1.9/2 transition. These variations are not clearly correlated with continuum and line intensity variations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_15979 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Extreme line profile variations in the repeating changing-look active galactic nucleus IRAS23226-3843 Kollatschny, Wolfram Grupe, Dirk Winkler, Hartmut Probst, Malte A. Ochmann, Martin W. Poenitzsch, Amon Schartel, Norbert Wolsing, Salem Komossa, Stefanie Potter, Stephen B. Astrophysics of Galaxies IRAS23226-3843 has been identified as a highly variable Seyfert galaxy and even as a changing-look active galactic nucleus based on optical spectra. Here we present follow-up observations - taken over the past five years - for examining the ongoing photometric and spectral variations in this remarkable galaxy. We carried out SWIFT observations of IRAS23226-3843 together with new optical spectra taken in 2023 and 2024. In parallel we investigate ASAS-SN photometric data from 2014 till 2025. IRAS23226-3843 stayed on a high continuum flux level in the X-ray as well as in the optical since a historic outburst in 2019. However, it shows strong short-term variations on timescales of a few months. Densely sampled ASAS-SN V-band continuum data from 2014 till 2025 confirm that behavior. IRAS23226-3843 switched from a clear Seyfert 1 type in December 2019 to a Seyfert 1.9/2 type in July 2020 based on its optical spectra. Afterward, it again became a Seyfert 1 type with symmetric broad single-peaked Balmer line profiles in January 2023. These spectra prove the repeating changing-look character of the galaxy.IRAS23226-3843 exhibits extreme high Balmer decrements Ha\Hb based on their broad line components. The Balmer decrement values are on the order of 10. IRAS23226-3843 successively showed all types of broad line Balmer profiles during the past 25 years over periods of many years: asymmetric single-peaked, double-peaked, as well as single-peaked and symmetric profiles in addition to its Seyfert 1.9/2 transition. These variations are not clearly correlated with continuum and line intensity variations. |
| title | Extreme line profile variations in the repeating changing-look active galactic nucleus IRAS23226-3843 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.15979 |