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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.03576 |
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| _version_ | 1866909459470614528 |
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| author | Kocevski, Dale D. Finkelstein, Steven L. Barro, Guillermo Taylor, Anthony J. Calabrò, Antonello Laloux, Brivael Buchner, Johannes Trump, Jonathan R. Leung, Gene C. K. Yang, Guang Dickinson, Mark Pérez-González, Pablo G. Pacucci, Fabio Inayoshi, Kohei Somerville, Rachel S. McGrath, Elizabeth J. Akins, Hollis B. Bagley, Micaela B. Bisigello, Laura Bowler, Rebecca A. A. Carnall, Adam Casey, Caitlin M. Cheng, Yingjie Cleri, Nikko J. Costantin, Luca Cullen, Fergus Davis, Kelcey Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Ferguson, Henry C. Fujimoto, Seiji Fontana, Adriano Giavalisco, Mauro Grazian, Andrea Grogin, Norman A. Hathi, Nimish P. Hirschmann, Michaela Huertas-Company, Marc Holwerda, Benne W. Illingworth, Garth Juneau, Stéphanie Kartaltepe, Jeyhan S. Koekemoer, Anton M. Li, Wenxiu Lucas, Ray A. Magee, Dan Mason, Charlotte McLeod, Derek J. McLure, Ross J. Napolitano, Lorenzo Papovich, Casey Pirzkal, Nor Rodighiero, Giulia Santini, Paola Wilkins, Stephen M. Yung, L. Y. Aaron |
| author_facet | Kocevski, Dale D. Finkelstein, Steven L. Barro, Guillermo Taylor, Anthony J. Calabrò, Antonello Laloux, Brivael Buchner, Johannes Trump, Jonathan R. Leung, Gene C. K. Yang, Guang Dickinson, Mark Pérez-González, Pablo G. Pacucci, Fabio Inayoshi, Kohei Somerville, Rachel S. McGrath, Elizabeth J. Akins, Hollis B. Bagley, Micaela B. Bisigello, Laura Bowler, Rebecca A. A. Carnall, Adam Casey, Caitlin M. Cheng, Yingjie Cleri, Nikko J. Costantin, Luca Cullen, Fergus Davis, Kelcey Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Ferguson, Henry C. Fujimoto, Seiji Fontana, Adriano Giavalisco, Mauro Grazian, Andrea Grogin, Norman A. Hathi, Nimish P. Hirschmann, Michaela Huertas-Company, Marc Holwerda, Benne W. Illingworth, Garth Juneau, Stéphanie Kartaltepe, Jeyhan S. Koekemoer, Anton M. Li, Wenxiu Lucas, Ray A. Magee, Dan Mason, Charlotte McLeod, Derek J. McLure, Ross J. Napolitano, Lorenzo Papovich, Casey Pirzkal, Nor Rodighiero, Giulia Santini, Paola Wilkins, Stephen M. Yung, L. Y. Aaron |
| contents | We present a sample of 341 "little red dots" (LRDs) spanning the redshift range $z\sim2-11$ using data from the CEERS, PRIMER, JADES, UNCOVER and NGDEEP surveys. Unlike past use of color indices to identify LRDs, we employ continuum slope fitting using shifting bandpasses to sample the same rest-frame emission blueward and redward of the Balmer break. This enables the detection of LRDs over a wider redshift range and with less contamination from galaxies with strong breaks that otherwise lack a rising red continuum. The redshift distribution of our sample increases at $z<8$ and then undergoes a rapid decline at $z\sim4.5$, which may tie the emergence of these sources to the inside-out growth that galaxies experience during this epoch. We find that LRDs are $\sim1$ dex more numerous than X-ray and UV selected AGN at z~5-7. Within our sample, we have identified the first two X-ray detected LRDs. An X-ray spectral analysis confirms that these AGN are moderately obscured with $\log\,(N_{\rm H}/{\rm cm}^{2}$) of $23.3^{+0.4}_{-1.3}$ and $22.72^{+0.13}_{-0.16}$. Our analysis reveals that reddened AGN emission dominates their rest-optical light, while the rest-UV originates from their host galaxies. We also present NIRSpec observations from the RUBIES survey of 17 LRDs that show broad emission lines consistent with AGN activity. The confirmed AGN fraction of our sample is 71\% for sources with F444W<26.5. In addition, we find three LRDs with blue-shifted Balmer absorption features in their spectra, suggesting an outflow of high-density, low-ionization gas from near the central engine of these faint, red AGN. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_03576 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Rise of Faint, Red AGN at $z>4$: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields Kocevski, Dale D. Finkelstein, Steven L. Barro, Guillermo Taylor, Anthony J. Calabrò, Antonello Laloux, Brivael Buchner, Johannes Trump, Jonathan R. Leung, Gene C. K. Yang, Guang Dickinson, Mark Pérez-González, Pablo G. Pacucci, Fabio Inayoshi, Kohei Somerville, Rachel S. McGrath, Elizabeth J. Akins, Hollis B. Bagley, Micaela B. Bisigello, Laura Bowler, Rebecca A. A. Carnall, Adam Casey, Caitlin M. Cheng, Yingjie Cleri, Nikko J. Costantin, Luca Cullen, Fergus Davis, Kelcey Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Ferguson, Henry C. Fujimoto, Seiji Fontana, Adriano Giavalisco, Mauro Grazian, Andrea Grogin, Norman A. Hathi, Nimish P. Hirschmann, Michaela Huertas-Company, Marc Holwerda, Benne W. Illingworth, Garth Juneau, Stéphanie Kartaltepe, Jeyhan S. Koekemoer, Anton M. Li, Wenxiu Lucas, Ray A. Magee, Dan Mason, Charlotte McLeod, Derek J. McLure, Ross J. Napolitano, Lorenzo Papovich, Casey Pirzkal, Nor Rodighiero, Giulia Santini, Paola Wilkins, Stephen M. Yung, L. Y. Aaron Astrophysics of Galaxies We present a sample of 341 "little red dots" (LRDs) spanning the redshift range $z\sim2-11$ using data from the CEERS, PRIMER, JADES, UNCOVER and NGDEEP surveys. Unlike past use of color indices to identify LRDs, we employ continuum slope fitting using shifting bandpasses to sample the same rest-frame emission blueward and redward of the Balmer break. This enables the detection of LRDs over a wider redshift range and with less contamination from galaxies with strong breaks that otherwise lack a rising red continuum. The redshift distribution of our sample increases at $z<8$ and then undergoes a rapid decline at $z\sim4.5$, which may tie the emergence of these sources to the inside-out growth that galaxies experience during this epoch. We find that LRDs are $\sim1$ dex more numerous than X-ray and UV selected AGN at z~5-7. Within our sample, we have identified the first two X-ray detected LRDs. An X-ray spectral analysis confirms that these AGN are moderately obscured with $\log\,(N_{\rm H}/{\rm cm}^{2}$) of $23.3^{+0.4}_{-1.3}$ and $22.72^{+0.13}_{-0.16}$. Our analysis reveals that reddened AGN emission dominates their rest-optical light, while the rest-UV originates from their host galaxies. We also present NIRSpec observations from the RUBIES survey of 17 LRDs that show broad emission lines consistent with AGN activity. The confirmed AGN fraction of our sample is 71\% for sources with F444W<26.5. In addition, we find three LRDs with blue-shifted Balmer absorption features in their spectra, suggesting an outflow of high-density, low-ionization gas from near the central engine of these faint, red AGN. |
| title | The Rise of Faint, Red AGN at $z>4$: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.03576 |