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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.07113 |
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| _version_ | 1866913934458486784 |
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| author | Onoue, Masafusa Ding, Xuheng Silverman, John D. Matsuoka, Yoshiki Izumi, Takuma Strauss, Michael A. Ward, Charlotte Phillips, Camryn L. Ito, Kei Andika, Irham T. Aoki, Kentaro Arita, Junya Baba, Shunsuke Bieri, Rebekka Bosman, Sarah E. I. Eilers, Anna-Christina Fujimoto, Seiji Habouzit, Melanie Haiman, Zoltan Imanishi, Masatoshi Inayoshi, Kohei Iwasawa, Kazushi Jahnke, Knud Kashikawa, Nobunari Kawaguchi, Toshihiro Kohno, Kotaro Lee, Chien-Hsiu Li, Junyao Lupi, Alessandro Lyu, Jianwei Nagao, Tohru Overzier, Roderik Schindler, Jan-Torge Schramm, Malte Scoggins, Matthew T. Shimasaku, Kazuhiro Toba, Yoshiki Trakhtenbrot, Benny Trebitsch, Maxime Treu, Tommaso Umehata, Hideki Venemans, Bram Vestergaard, Marianne Volonteri, Marta Walter, Fabian Wang, Feige Yang, Jinyi Zhang, Haowen |
| author_facet | Onoue, Masafusa Ding, Xuheng Silverman, John D. Matsuoka, Yoshiki Izumi, Takuma Strauss, Michael A. Ward, Charlotte Phillips, Camryn L. Ito, Kei Andika, Irham T. Aoki, Kentaro Arita, Junya Baba, Shunsuke Bieri, Rebekka Bosman, Sarah E. I. Eilers, Anna-Christina Fujimoto, Seiji Habouzit, Melanie Haiman, Zoltan Imanishi, Masatoshi Inayoshi, Kohei Iwasawa, Kazushi Jahnke, Knud Kashikawa, Nobunari Kawaguchi, Toshihiro Kohno, Kotaro Lee, Chien-Hsiu Li, Junyao Lupi, Alessandro Lyu, Jianwei Nagao, Tohru Overzier, Roderik Schindler, Jan-Torge Schramm, Malte Scoggins, Matthew T. Shimasaku, Kazuhiro Toba, Yoshiki Trakhtenbrot, Benny Trebitsch, Maxime Treu, Tommaso Umehata, Hideki Venemans, Bram Vestergaard, Marianne Volonteri, Marta Walter, Fabian Wang, Feige Yang, Jinyi Zhang, Haowen |
| contents | Understanding the rapid formation of supermassive black holes (SMBHs) in the early universe requires insight into stellar mass growth in host galaxies. Here, we present NIRSpec rest-frame optical spectra and NIRCam imaging from JWST of two galaxies at z>6, both hosting moderate-luminosity quasars. These galaxies exhibit Balmer absorption lines, similar to low-redshift post-starburst galaxies. Our analyses of the medium-resolution spectra and multiband photometry show bulk of the stellar mass (log (M_* / M_sun) > 10.6) formed in starburst episodes at redshift 9 and 7. One of the galaxies shows a clear Balmer break and lacks spatially resolved H alpha emission. It falls well below the star formation main sequence at z = 6, indicating quiescence. The other is transitioning to quiescence; together, these massive galaxies are among the most distant post-starburst systems known. The blueshifted wings of the quasar [O III] emission lines suggest quasar-driven outflow possibly influencing star formation. Direct stellar velocity dispersion measurements reveal one galaxy follows the local black hole mass-sigma_* relation while the other is overmassive. The existence of massive post-starburst galaxies hosting billion-solar-mass BHs in short-lived quasar phases suggests SMBHs and host galaxies played a major role in each other's rapid early formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07113 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Post-Starburst Pathway for the Formation of Massive Galaxies and Black Holes at z>6 Onoue, Masafusa Ding, Xuheng Silverman, John D. Matsuoka, Yoshiki Izumi, Takuma Strauss, Michael A. Ward, Charlotte Phillips, Camryn L. Ito, Kei Andika, Irham T. Aoki, Kentaro Arita, Junya Baba, Shunsuke Bieri, Rebekka Bosman, Sarah E. I. Eilers, Anna-Christina Fujimoto, Seiji Habouzit, Melanie Haiman, Zoltan Imanishi, Masatoshi Inayoshi, Kohei Iwasawa, Kazushi Jahnke, Knud Kashikawa, Nobunari Kawaguchi, Toshihiro Kohno, Kotaro Lee, Chien-Hsiu Li, Junyao Lupi, Alessandro Lyu, Jianwei Nagao, Tohru Overzier, Roderik Schindler, Jan-Torge Schramm, Malte Scoggins, Matthew T. Shimasaku, Kazuhiro Toba, Yoshiki Trakhtenbrot, Benny Trebitsch, Maxime Treu, Tommaso Umehata, Hideki Venemans, Bram Vestergaard, Marianne Volonteri, Marta Walter, Fabian Wang, Feige Yang, Jinyi Zhang, Haowen Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Understanding the rapid formation of supermassive black holes (SMBHs) in the early universe requires insight into stellar mass growth in host galaxies. Here, we present NIRSpec rest-frame optical spectra and NIRCam imaging from JWST of two galaxies at z>6, both hosting moderate-luminosity quasars. These galaxies exhibit Balmer absorption lines, similar to low-redshift post-starburst galaxies. Our analyses of the medium-resolution spectra and multiband photometry show bulk of the stellar mass (log (M_* / M_sun) > 10.6) formed in starburst episodes at redshift 9 and 7. One of the galaxies shows a clear Balmer break and lacks spatially resolved H alpha emission. It falls well below the star formation main sequence at z = 6, indicating quiescence. The other is transitioning to quiescence; together, these massive galaxies are among the most distant post-starburst systems known. The blueshifted wings of the quasar [O III] emission lines suggest quasar-driven outflow possibly influencing star formation. Direct stellar velocity dispersion measurements reveal one galaxy follows the local black hole mass-sigma_* relation while the other is overmassive. The existence of massive post-starburst galaxies hosting billion-solar-mass BHs in short-lived quasar phases suggests SMBHs and host galaxies played a major role in each other's rapid early formation. |
| title | A Post-Starburst Pathway for the Formation of Massive Galaxies and Black Holes at z>6 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2409.07113 |