Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2509.02027 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866909874119507968 |
|---|---|
| author | Ren, Wenke Silverman, John D. Faisst, Andreas L. Fujimoto, Seiji Yan, Lin Liu, Zhaoxuan Tsujita, Akiyoshi Aravena, Manuel Davies, Rebecca L. De Looze, Ilse Dessauges-Zavadsky, Miroslava Herrera-Camus, Rodrigo Ibar, Edo Jones, Gareth C. Kartaltepe, Jeyhan S. Koekemoer, Anton M. Lin, Yu-Heng Mitsuhashi, Ikki Molina, Juan Nanni, Ambra Relano, Monica Romano, Michael Sanders, David B. Solimano, Manuel Veraldi, Enrico Villanueva, Vicente Wang, Wuji Zamorani, Giovanni |
| author_facet | Ren, Wenke Silverman, John D. Faisst, Andreas L. Fujimoto, Seiji Yan, Lin Liu, Zhaoxuan Tsujita, Akiyoshi Aravena, Manuel Davies, Rebecca L. De Looze, Ilse Dessauges-Zavadsky, Miroslava Herrera-Camus, Rodrigo Ibar, Edo Jones, Gareth C. Kartaltepe, Jeyhan S. Koekemoer, Anton M. Lin, Yu-Heng Mitsuhashi, Ikki Molina, Juan Nanni, Ambra Relano, Monica Romano, Michael Sanders, David B. Solimano, Manuel Veraldi, Enrico Villanueva, Vicente Wang, Wuji Zamorani, Giovanni |
| contents | We present a systematic search for broad-line active galactic nuclei (AGNs) in the ALPINE-CRISTAL-JWST sample of 18 star-forming galaxies ($M_\star>10^{9.5}~M_{\odot}$) at redshifts $z=4.4-5.7$. Using JWST/NIRSpec IFU, we identify 7 AGN candidates through the detection of broad \Ha\ emission lines from 33 aperture spectra centred on photometric peaks. These candidates include one highly robust AGN detection with FWHM $\sim$ 2800 \kms\ and six showing broad components with FWHM $\sim 600-1600$ \kms, with two in a merger system. We highlight that only broad-line detection is effective since these candidates uniformly lie within narrow emission-line ratio diagnostic diagrams where star-forming galaxies and AGNs overlap. The broad-line AGN fraction ranges from 5.9\% to 33\%, depending on the robustness of the candidates. Assuming that the majority are AGNs, the relatively high AGN fraction is likely due to targeting high-mass galaxies, where simulations demonstrate that broad-line detection is more feasible. Their black hole masses range from $10^6$ to $10^{7.5}~M_{\odot}$ with $0.1 \lesssim L_{\rm bol}/L_{\rm Edd}\lesssim 1$. Counter to previous JWST studies at high redshift that found overmassive black holes relative to their host galaxies, our candidates lie close to or below the local $M_{\rm BH}-M_\star$ scaling relations, thus demonstrating the effect of selection biases. This study provides new insights into AGN-host galaxy co-evolution at high redshift by identifying faint broad-line AGNs in galaxy samples, highlighting the importance of considering mass-dependent selection biases and the likelihood of a large population of AGNs being undermassive and just now being tapped by JWST. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02027 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The ALPINE-CRISTAL-JWST Survey: Revealing Less Massive Black Holes in High-Redshift Galaxies Ren, Wenke Silverman, John D. Faisst, Andreas L. Fujimoto, Seiji Yan, Lin Liu, Zhaoxuan Tsujita, Akiyoshi Aravena, Manuel Davies, Rebecca L. De Looze, Ilse Dessauges-Zavadsky, Miroslava Herrera-Camus, Rodrigo Ibar, Edo Jones, Gareth C. Kartaltepe, Jeyhan S. Koekemoer, Anton M. Lin, Yu-Heng Mitsuhashi, Ikki Molina, Juan Nanni, Ambra Relano, Monica Romano, Michael Sanders, David B. Solimano, Manuel Veraldi, Enrico Villanueva, Vicente Wang, Wuji Zamorani, Giovanni Astrophysics of Galaxies We present a systematic search for broad-line active galactic nuclei (AGNs) in the ALPINE-CRISTAL-JWST sample of 18 star-forming galaxies ($M_\star>10^{9.5}~M_{\odot}$) at redshifts $z=4.4-5.7$. Using JWST/NIRSpec IFU, we identify 7 AGN candidates through the detection of broad \Ha\ emission lines from 33 aperture spectra centred on photometric peaks. These candidates include one highly robust AGN detection with FWHM $\sim$ 2800 \kms\ and six showing broad components with FWHM $\sim 600-1600$ \kms, with two in a merger system. We highlight that only broad-line detection is effective since these candidates uniformly lie within narrow emission-line ratio diagnostic diagrams where star-forming galaxies and AGNs overlap. The broad-line AGN fraction ranges from 5.9\% to 33\%, depending on the robustness of the candidates. Assuming that the majority are AGNs, the relatively high AGN fraction is likely due to targeting high-mass galaxies, where simulations demonstrate that broad-line detection is more feasible. Their black hole masses range from $10^6$ to $10^{7.5}~M_{\odot}$ with $0.1 \lesssim L_{\rm bol}/L_{\rm Edd}\lesssim 1$. Counter to previous JWST studies at high redshift that found overmassive black holes relative to their host galaxies, our candidates lie close to or below the local $M_{\rm BH}-M_\star$ scaling relations, thus demonstrating the effect of selection biases. This study provides new insights into AGN-host galaxy co-evolution at high redshift by identifying faint broad-line AGNs in galaxy samples, highlighting the importance of considering mass-dependent selection biases and the likelihood of a large population of AGNs being undermassive and just now being tapped by JWST. |
| title | The ALPINE-CRISTAL-JWST Survey: Revealing Less Massive Black Holes in High-Redshift Galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.02027 |