Automated detection of double nuclei galaxies using Gothic and the discovery of a large sample of dual AGN
Article Swipe
Anwesh Bhattacharya
,
C P Nehal
,
Mousumi Das
,
Abhishek Paswan
,
Snehanshu Saha
,
F. Combes
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stad2117
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stad2117
We present a novel algorithm to detect double nuclei galaxies (DNG) called Gothic (Graph-bOosTed iterated HIll Climbing) – that detects whether a given image of a galaxy has two or more closely separated nuclei. Our aim is to test for the presence of dual/multiple active galactic nuclei (AGN) in galaxies that visually represent a DNG. Although galaxy mergers are common, the detection of dual AGN is rare. Their detection is very important as they help us understand the formation of supermassive black hole (SMBH) binaries, SMBH growth and AGN feedback effects in multiple nuclei systems. There is thus a need for an algorithm to do a systematic survey of existing imaging data for the discovery of DNGs and dual AGNs. We have tested Gothic on an established sample of DNGs with a 100 per cent detection rate and subsequently conducted a blind search of 1 million SDSS DR16 galaxies (with spectroscopic data available) lying in the redshift range of z = 0 to 0.75. From the list of candidate DNGs found, we have detected 159 dual AGNs, of which 2 are triple AGN systems. Our results show that dual AGNs are not common, and triple AGN even rarer. The colour (u–r) magnitude plots of the DNGs indicate that star formation is quenched as the nuclei come closer and as the AGN fraction increases. The quenching is especially prominent for dual/triple AGN galaxies that lie at the extreme end of the red sequence.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stad2117
- https://academic.oup.com/mnras/article-pdf/524/3/4482/50976695/stad2117.pdf
- OA Status
- bronze
- Cited By
- 9
- References
- 82
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4385469251
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- DOI
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https://doi.org/10.1093/mnras/stad2117Digital Object Identifier
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Automated detection of double nuclei galaxies using
Gothic and the discovery of a large sample of dual AGNWork title - Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-07-22Full publication date if available
- Authors
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Anwesh Bhattacharya, C P Nehal, Mousumi Das, Abhishek Paswan, Snehanshu Saha, F. CombesList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/stad2117Publisher landing page
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https://academic.oup.com/mnras/article-pdf/524/3/4482/50976695/stad2117.pdfDirect link to full text PDF
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YesWhether a free full text is available
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bronzeOpen access status per OpenAlex
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https://academic.oup.com/mnras/article-pdf/524/3/4482/50976695/stad2117.pdfDirect OA link when available
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Physics, Dual (grammatical number), Astrophysics, Galaxy, Sample (material), Astronomy, Art, Literature, ThermodynamicsTop concepts (fields/topics) attached by OpenAlex
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9Total citation count in OpenAlex
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2025: 6, 2024: 2, 2023: 1Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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