BASS LIV. Physical Properties of AGN-Hosting Galaxy Mergers from Multiwavelength SED Fitting
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909799594065920 |
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| author | Troncoso, Marco Treister, Ezequiel Rojas, Alejandra Boquien, Médéric Bauer, Franz Koss, Michael J. Assef, Roberto J. Tello, Miguel Parra del Moral-Castro, Ignacio Ricci, Claudio Dai, Sophia Oh, Kyuseok Ricci, Frederica Peca, Alessandro Urry, C. Megan Gupta, Kriti Kamal Venturi, Giacomo Signorini, Matilde Mushotzky, Richard Sanders, David |
| author_facet | Troncoso, Marco Treister, Ezequiel Rojas, Alejandra Boquien, Médéric Bauer, Franz Koss, Michael J. Assef, Roberto J. Tello, Miguel Parra del Moral-Castro, Ignacio Ricci, Claudio Dai, Sophia Oh, Kyuseok Ricci, Frederica Peca, Alessandro Urry, C. Megan Gupta, Kriti Kamal Venturi, Giacomo Signorini, Matilde Mushotzky, Richard Sanders, David |
| contents | Galaxy mergers are believed to play an important role in triggering rapid supermassive black hole (SMBH) growth. As merging nuclei approach each other, the physical properties of the participating galaxies and the associated SMBH growth are expected to evolve significantly. This study measures and characterizes these physical properties throughout the merger sequence. We constructed multiwavelength Spectral Energy Distributions (SEDs) from hard X-rays to the far-infrared (FIR) for a sample of 72 nearby Active Galactic Nuclei (AGN) host galaxies. The sample comprises 64 interacting systems, including single AGNs in mergers and dual AGNs, with nuclear separations $\leq$30 kpc, as well as eight isolated active galaxies with merging features. We carefully adapted available photometric measurements at each wavelength to account for their complex morphologies and varying spatial resolutions, to perform SED fitting using CIGALE, aimed to derive critical physical properties. Our results reveal that merging galaxies hosting AGN(s) show deviations from the star-forming main sequence, and a wide range of star formation rates (SFRs). Both AGN activity and star formation are significantly influenced by the merger process, but these effects are more prominent in major, mass ratios $<$4:1, interactions. We find that the projected nuclear separation is not a good tracer of the merger stage. Instead, morphological classification accurately assesses the merger progression. Based on this morphological analysis, late-stage mergers exhibit elevated SFRs (5.1$\times$), AGN luminosities (2.4$\times$), and nuclear obscuration (2.8$\times$) compared to earlier stages, supporting previous findings and reinforcing the link between merger-driven galaxy evolution and SMBH growth. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17720 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | BASS LIV. Physical Properties of AGN-Hosting Galaxy Mergers from Multiwavelength SED Fitting Troncoso, Marco Treister, Ezequiel Rojas, Alejandra Boquien, Médéric Bauer, Franz Koss, Michael J. Assef, Roberto J. Tello, Miguel Parra del Moral-Castro, Ignacio Ricci, Claudio Dai, Sophia Oh, Kyuseok Ricci, Frederica Peca, Alessandro Urry, C. Megan Gupta, Kriti Kamal Venturi, Giacomo Signorini, Matilde Mushotzky, Richard Sanders, David Astrophysics of Galaxies Galaxy mergers are believed to play an important role in triggering rapid supermassive black hole (SMBH) growth. As merging nuclei approach each other, the physical properties of the participating galaxies and the associated SMBH growth are expected to evolve significantly. This study measures and characterizes these physical properties throughout the merger sequence. We constructed multiwavelength Spectral Energy Distributions (SEDs) from hard X-rays to the far-infrared (FIR) for a sample of 72 nearby Active Galactic Nuclei (AGN) host galaxies. The sample comprises 64 interacting systems, including single AGNs in mergers and dual AGNs, with nuclear separations $\leq$30 kpc, as well as eight isolated active galaxies with merging features. We carefully adapted available photometric measurements at each wavelength to account for their complex morphologies and varying spatial resolutions, to perform SED fitting using CIGALE, aimed to derive critical physical properties. Our results reveal that merging galaxies hosting AGN(s) show deviations from the star-forming main sequence, and a wide range of star formation rates (SFRs). Both AGN activity and star formation are significantly influenced by the merger process, but these effects are more prominent in major, mass ratios $<$4:1, interactions. We find that the projected nuclear separation is not a good tracer of the merger stage. Instead, morphological classification accurately assesses the merger progression. Based on this morphological analysis, late-stage mergers exhibit elevated SFRs (5.1$\times$), AGN luminosities (2.4$\times$), and nuclear obscuration (2.8$\times$) compared to earlier stages, supporting previous findings and reinforcing the link between merger-driven galaxy evolution and SMBH growth. |
| title | BASS LIV. Physical Properties of AGN-Hosting Galaxy Mergers from Multiwavelength SED Fitting |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.17720 |