Exploring the Nature of Little Red Dots: Constraints on AGN and Stellar Contributions from PRIMER MIRI Imaging
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866910708048855040 |
|---|---|
| author | Leung, Gene C. K. Finkelstein, Steven L. Pérez-González, Pablo G. Morales, Alexa M. Taylor, Anthony J. Barro, Guillermo Kocevski, Dale D. Akins, Hollis B. Carnall, Adam C. Ortiz, Óscar A. Chávez Cleri, Nikko J. Cullen, Fergus Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Grogin, Norman A. Hirschmann, Michaela Koekemoer, Anton M. Kokorev, Vasily Lucas, Ray A. McLeod, Derek J. Papovich, Casey Yung, L. Y. Aaron |
| author_facet | Leung, Gene C. K. Finkelstein, Steven L. Pérez-González, Pablo G. Morales, Alexa M. Taylor, Anthony J. Barro, Guillermo Kocevski, Dale D. Akins, Hollis B. Carnall, Adam C. Ortiz, Óscar A. Chávez Cleri, Nikko J. Cullen, Fergus Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Grogin, Norman A. Hirschmann, Michaela Koekemoer, Anton M. Kokorev, Vasily Lucas, Ray A. McLeod, Derek J. Papovich, Casey Yung, L. Y. Aaron |
| contents | JWST has revealed a large population of compact, red galaxies at $z>4$ known as Little Red Dots (LRDs). We analyze the spectral energy distributions (SEDs) of 95 LRDs from the JWST PRIMER survey with complete photometric coverage from $1-18\ μ$m using NIRCam and MIRI imaging, representing the most extensive SED analysis on a large LRD sample with long-wavelength MIRI data. We examine SED models in which either galaxy or active galactic nucleus (AGN) emission dominates the rest-frame UV or optical continuum, extracting physical properties to explore each scenario's implications. In the galaxy-only model, we find massive, dusty stellar populations alongside unobscured, low-mass components, hinting at inhomogeneous obscuration. The AGN-only model indicates dusty, luminous AGNs with low hot dust fractions compared to typical quasars. A hybrid AGN and galaxy model suggests low-mass, unobscured galaxies in the UV, with stellar mass estimates spanning $\sim$2 dex across the different models, underscoring the need for caution in interpreting LRD stellar masses. With MIRI photometry, the galaxy-only model produces stellar masses within cosmological limits, but extremely high stellar mass densities are inferred. The hybrid model infers highly overmassive black holes exceeding those in recently reported high-redshift AGNs, hinting at a partial AGN contribution to the rest-optical continuum or widespread super-Eddington accretion. Our findings highlight the extreme conditions required for both AGN or galaxy dominated scenarios in LRDs, supporting a mixed contribution to the red continuum, or novel scenarios to explain the observed emission. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_12005 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring the Nature of Little Red Dots: Constraints on AGN and Stellar Contributions from PRIMER MIRI Imaging Leung, Gene C. K. Finkelstein, Steven L. Pérez-González, Pablo G. Morales, Alexa M. Taylor, Anthony J. Barro, Guillermo Kocevski, Dale D. Akins, Hollis B. Carnall, Adam C. Ortiz, Óscar A. Chávez Cleri, Nikko J. Cullen, Fergus Donnan, Callum T. Dunlop, James S. Ellis, Richard S. Grogin, Norman A. Hirschmann, Michaela Koekemoer, Anton M. Kokorev, Vasily Lucas, Ray A. McLeod, Derek J. Papovich, Casey Yung, L. Y. Aaron Astrophysics of Galaxies JWST has revealed a large population of compact, red galaxies at $z>4$ known as Little Red Dots (LRDs). We analyze the spectral energy distributions (SEDs) of 95 LRDs from the JWST PRIMER survey with complete photometric coverage from $1-18\ μ$m using NIRCam and MIRI imaging, representing the most extensive SED analysis on a large LRD sample with long-wavelength MIRI data. We examine SED models in which either galaxy or active galactic nucleus (AGN) emission dominates the rest-frame UV or optical continuum, extracting physical properties to explore each scenario's implications. In the galaxy-only model, we find massive, dusty stellar populations alongside unobscured, low-mass components, hinting at inhomogeneous obscuration. The AGN-only model indicates dusty, luminous AGNs with low hot dust fractions compared to typical quasars. A hybrid AGN and galaxy model suggests low-mass, unobscured galaxies in the UV, with stellar mass estimates spanning $\sim$2 dex across the different models, underscoring the need for caution in interpreting LRD stellar masses. With MIRI photometry, the galaxy-only model produces stellar masses within cosmological limits, but extremely high stellar mass densities are inferred. The hybrid model infers highly overmassive black holes exceeding those in recently reported high-redshift AGNs, hinting at a partial AGN contribution to the rest-optical continuum or widespread super-Eddington accretion. Our findings highlight the extreme conditions required for both AGN or galaxy dominated scenarios in LRDs, supporting a mixed contribution to the red continuum, or novel scenarios to explain the observed emission. |
| title | Exploring the Nature of Little Red Dots: Constraints on AGN and Stellar Contributions from PRIMER MIRI Imaging |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.12005 |