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CAPERS-LRD-z9: A Gas Enshrouded Little Red Dot Hosting a Broad-line AGN at z=9.288

Fuente: arXiv

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Détails bibliographiques
Auteurs principaux:	Taylor, Anthony J., Kokorev, Vasily, Kocevski, Dale D., Akins, Hollis B., Cullen, Fergus, Dickinson, Mark, Finkelstein, Steven L., Haro, Pablo Arrabal, Bromm, Volker, Giavalisco, Mauro, Inayoshi, Kohei, Juneau, Stephanie, Leung, Gene C. K., Perez-Gonzalez, Pablo G., Somerville, Rachel S., Trump, Jonathan R., Amorin, Ricardo O., Barro, Guillermo, Burgarella, Denis, Brooks, Madisyn, Carnall, Adam, Casey, Caitlin M., Cheng, Yingjie, Chisholm, John, Chworowsky, Katherine, Davis, Kelcey, Donnan, Callum T., Dunlop, James S., Ellis, Richard S., Fernandez, Vital, Fujimoto, Seiji, Grogin, Norman A., Gupta, Ansh R., Hathi, Nimish P., Jung, Intae, Hirschmann, Michaela, Kartaltepe, Jeyhan S., Koekemoer, Anton M., Larson, Rebecca L., Leung, Ho-Hin, Llerena, Mario, Lucas, Ray A., McLeod, Derek J., McLure, Ross, Napolitano, Lorenzo, Papovich, Casey, Stanton, Thomas M., Tripodi, Roberta, Wang, Xin, Wilkins, Stephen M., Yung, L. Y. Aaron, Zavala, Jorge A.
Format:	Preprint
Publié:	2025
Sujets:	Astrophysics of Galaxies
Accès en ligne:	Acceder al recurso
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author	Taylor, Anthony J. Kokorev, Vasily Kocevski, Dale D. Akins, Hollis B. Cullen, Fergus Dickinson, Mark Finkelstein, Steven L. Haro, Pablo Arrabal Bromm, Volker Giavalisco, Mauro Inayoshi, Kohei Juneau, Stephanie Leung, Gene C. K. Perez-Gonzalez, Pablo G. Somerville, Rachel S. Trump, Jonathan R. Amorin, Ricardo O. Barro, Guillermo Burgarella, Denis Brooks, Madisyn Carnall, Adam Casey, Caitlin M. Cheng, Yingjie Chisholm, John Chworowsky, Katherine Davis, Kelcey Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Fernandez, Vital Fujimoto, Seiji Grogin, Norman A. Gupta, Ansh R. Hathi, Nimish P. Jung, Intae Hirschmann, Michaela Kartaltepe, Jeyhan S. Koekemoer, Anton M. Larson, Rebecca L. Leung, Ho-Hin Llerena, Mario Lucas, Ray A. McLeod, Derek J. McLure, Ross Napolitano, Lorenzo Papovich, Casey Stanton, Thomas M. Tripodi, Roberta Wang, Xin Wilkins, Stephen M. Yung, L. Y. Aaron Zavala, Jorge A.
author_facet	Taylor, Anthony J. Kokorev, Vasily Kocevski, Dale D. Akins, Hollis B. Cullen, Fergus Dickinson, Mark Finkelstein, Steven L. Haro, Pablo Arrabal Bromm, Volker Giavalisco, Mauro Inayoshi, Kohei Juneau, Stephanie Leung, Gene C. K. Perez-Gonzalez, Pablo G. Somerville, Rachel S. Trump, Jonathan R. Amorin, Ricardo O. Barro, Guillermo Burgarella, Denis Brooks, Madisyn Carnall, Adam Casey, Caitlin M. Cheng, Yingjie Chisholm, John Chworowsky, Katherine Davis, Kelcey Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Fernandez, Vital Fujimoto, Seiji Grogin, Norman A. Gupta, Ansh R. Hathi, Nimish P. Jung, Intae Hirschmann, Michaela Kartaltepe, Jeyhan S. Koekemoer, Anton M. Larson, Rebecca L. Leung, Ho-Hin Llerena, Mario Lucas, Ray A. McLeod, Derek J. McLure, Ross Napolitano, Lorenzo Papovich, Casey Stanton, Thomas M. Tripodi, Roberta Wang, Xin Wilkins, Stephen M. Yung, L. Y. Aaron Zavala, Jorge A.
contents	We present CAPERS-LRD-z9, a little red dot (LRD) which we confirm to be a $z=9.288$ broad-line AGN (BLAGN). First identified as a high-redshift LRD candidate from PRIMER NIRCam photometry, follow-up NIRSpec/PRISM spectroscopy of CAPERS-LRD-z9 from the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS) has revealed a broad $3500$ km s$^{-1}$ H$β$ emission line and narrow [O III]$λ\lambda4959,5007$ lines, indicative of a BLAGN. Based on the broad H$β$ line, we compute a canonical black-hole mass of $\log(M_{\textrm{BH}}/M_{\odot})=7.58\pm0.15$, although full consideration of systematic uncertainties yields a conservative range of $6.65<\log(M_{\textrm{BH}}/M_{\odot})<8.50$. These observations suggest that either a massive black hole seed, or a lighter stellar remnant seed undergoing periods of super-Eddington accretion, is necessary to grow such a massive black hole in $\lesssim500$ Myr of cosmic time. CAPERS-LRD-z9 exhibits a strong Balmer break, consistent with a central AGN surrounded by dense ($\sim 10^{10}\textrm{ cm}^{-3}$) neutral gas. We model CAPERS-LRD-z9 using CLOUDY to fit the emission red-ward of the Balmer break with a dense gas-enshrouded AGN, and bagpipes to fit the rest-ultraviolet emission as a host-galaxy stellar population. This upper limit on the stellar mass of the host galaxy ($<10^9\,{\rm M_\odot}$) implies that the black-hole to stellar mass ratio may be extremely large, possibly $>5\%$ (although systematic uncertainties on the black-hole mass prevent strong conclusions). However, the shape of the UV continuum differs from typical high-redshift star-forming galaxies, indicating that this UV emission may also be of AGN origin, and hence the true stellar mass of the host may be still lower.
format	Preprint
id	arxiv_https___arxiv_org_abs_2505_04609
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	CAPERS-LRD-z9: A Gas Enshrouded Little Red Dot Hosting a Broad-line AGN at z=9.288 Taylor, Anthony J. Kokorev, Vasily Kocevski, Dale D. Akins, Hollis B. Cullen, Fergus Dickinson, Mark Finkelstein, Steven L. Haro, Pablo Arrabal Bromm, Volker Giavalisco, Mauro Inayoshi, Kohei Juneau, Stephanie Leung, Gene C. K. Perez-Gonzalez, Pablo G. Somerville, Rachel S. Trump, Jonathan R. Amorin, Ricardo O. Barro, Guillermo Burgarella, Denis Brooks, Madisyn Carnall, Adam Casey, Caitlin M. Cheng, Yingjie Chisholm, John Chworowsky, Katherine Davis, Kelcey Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Fernandez, Vital Fujimoto, Seiji Grogin, Norman A. Gupta, Ansh R. Hathi, Nimish P. Jung, Intae Hirschmann, Michaela Kartaltepe, Jeyhan S. Koekemoer, Anton M. Larson, Rebecca L. Leung, Ho-Hin Llerena, Mario Lucas, Ray A. McLeod, Derek J. McLure, Ross Napolitano, Lorenzo Papovich, Casey Stanton, Thomas M. Tripodi, Roberta Wang, Xin Wilkins, Stephen M. Yung, L. Y. Aaron Zavala, Jorge A. Astrophysics of Galaxies We present CAPERS-LRD-z9, a little red dot (LRD) which we confirm to be a $z=9.288$ broad-line AGN (BLAGN). First identified as a high-redshift LRD candidate from PRIMER NIRCam photometry, follow-up NIRSpec/PRISM spectroscopy of CAPERS-LRD-z9 from the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS) has revealed a broad $3500$ km s$^{-1}$ H$β$ emission line and narrow [O III]$λ\lambda4959,5007$ lines, indicative of a BLAGN. Based on the broad H$β$ line, we compute a canonical black-hole mass of $\log(M_{\textrm{BH}}/M_{\odot})=7.58\pm0.15$, although full consideration of systematic uncertainties yields a conservative range of $6.65<\log(M_{\textrm{BH}}/M_{\odot})<8.50$. These observations suggest that either a massive black hole seed, or a lighter stellar remnant seed undergoing periods of super-Eddington accretion, is necessary to grow such a massive black hole in $\lesssim500$ Myr of cosmic time. CAPERS-LRD-z9 exhibits a strong Balmer break, consistent with a central AGN surrounded by dense ($\sim 10^{10}\textrm{ cm}^{-3}$) neutral gas. We model CAPERS-LRD-z9 using CLOUDY to fit the emission red-ward of the Balmer break with a dense gas-enshrouded AGN, and bagpipes to fit the rest-ultraviolet emission as a host-galaxy stellar population. This upper limit on the stellar mass of the host galaxy ($<10^9\,{\rm M_\odot}$) implies that the black-hole to stellar mass ratio may be extremely large, possibly $>5\%$ (although systematic uncertainties on the black-hole mass prevent strong conclusions). However, the shape of the UV continuum differs from typical high-redshift star-forming galaxies, indicating that this UV emission may also be of AGN origin, and hence the true stellar mass of the host may be still lower.
title	CAPERS-LRD-z9: A Gas Enshrouded Little Red Dot Hosting a Broad-line AGN at z=9.288
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2505.04609