EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations
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2024
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| author | Harvey, Thomas Conselice, Christopher J. Adams, Nathan J. Austin, Duncan Juodzbalis, Ignas Trussler, James Li, Qiong Ormerod, Katherine Ferreira, Leonardo Lovell, Christopher C. Duan, Qiao Westcott, Lewi Harris, Honor Bhatawdekar, Rachana Coe, Dan Cohen, Seth H. Caruana, Joseph Cheng, Cheng Driver, Simon P. Frye, Brenda Furtak, Lukas J. Grogin, Norman A. Hathi, Nimish P. Holwerda, Benne W. Jansen, Rolf A. Koekemoer, Anton M. Marshall, Madeline A. Nonino, Mario Vijayan, Aswin P. Wilkins, Stephen M. Windhorst, Rogier Willmer, Christopher N. A. Yan, Haojing Zitrin, Adi |
| author_facet | Harvey, Thomas Conselice, Christopher J. Adams, Nathan J. Austin, Duncan Juodzbalis, Ignas Trussler, James Li, Qiong Ormerod, Katherine Ferreira, Leonardo Lovell, Christopher C. Duan, Qiao Westcott, Lewi Harris, Honor Bhatawdekar, Rachana Coe, Dan Cohen, Seth H. Caruana, Joseph Cheng, Cheng Driver, Simon P. Frye, Brenda Furtak, Lukas J. Grogin, Norman A. Hathi, Nimish P. Holwerda, Benne W. Jansen, Rolf A. Koekemoer, Anton M. Marshall, Madeline A. Nonino, Mario Vijayan, Aswin P. Wilkins, Stephen M. Windhorst, Rogier Willmer, Christopher N. A. Yan, Haojing Zitrin, Adi |
| contents | We utilize deep JWST NIRCam observations for the first direct constraints on the Galaxy Stellar Mass Function (GSMF) at $z>10$. Our EPOCHS v1 sample includes 1120 galaxy candidates at $6.5<z<13.5$ taken from a consistent reduction and analysis of publicly available deep JWST NIRCam data covering the PEARLS, CEERS, GLASS, JADES GOOD-S, NGDEEP, and SMACS0723 surveys, totalling 187 arcmin$^2$. We investigate the impact of SED fitting methods, assumed star formation histories (SFH), dust laws, and priors on galaxy masses and the resultant GSMF. Whilst our fiducial GSMF agrees with the literature at $z<13.5$, we find that the assumed SFH model has a large impact on the GSMF and stellar mass density (SMD), finding a 0.75~dex increase in the SMD at $z=10.5$ between a flexible non-parametric and standard parametric SFH. Overall, we find a flatter SMD evolution at $z \geq 9$ than some studies predict, suggesting a rapid buildup of stellar mass in the early Universe. We find no incompatibility between our results and those of standard cosmological models, as suggested previously, although the most massive galaxies may require a high star formation efficiency. We find that the "Little Red Dot" galaxies dominate the $z=7$ GSMF at high-masses, necessitating a better understanding of the relative contributions of AGN and stellar emission. We show that assuming a theoretically motivated top-heavy IMF reduces stellar mass by 0.5~dex without affecting fit quality, but our results remain consistent with existing cosmological models with a standard IMF. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_03908 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations Harvey, Thomas Conselice, Christopher J. Adams, Nathan J. Austin, Duncan Juodzbalis, Ignas Trussler, James Li, Qiong Ormerod, Katherine Ferreira, Leonardo Lovell, Christopher C. Duan, Qiao Westcott, Lewi Harris, Honor Bhatawdekar, Rachana Coe, Dan Cohen, Seth H. Caruana, Joseph Cheng, Cheng Driver, Simon P. Frye, Brenda Furtak, Lukas J. Grogin, Norman A. Hathi, Nimish P. Holwerda, Benne W. Jansen, Rolf A. Koekemoer, Anton M. Marshall, Madeline A. Nonino, Mario Vijayan, Aswin P. Wilkins, Stephen M. Windhorst, Rogier Willmer, Christopher N. A. Yan, Haojing Zitrin, Adi Astrophysics of Galaxies We utilize deep JWST NIRCam observations for the first direct constraints on the Galaxy Stellar Mass Function (GSMF) at $z>10$. Our EPOCHS v1 sample includes 1120 galaxy candidates at $6.5<z<13.5$ taken from a consistent reduction and analysis of publicly available deep JWST NIRCam data covering the PEARLS, CEERS, GLASS, JADES GOOD-S, NGDEEP, and SMACS0723 surveys, totalling 187 arcmin$^2$. We investigate the impact of SED fitting methods, assumed star formation histories (SFH), dust laws, and priors on galaxy masses and the resultant GSMF. Whilst our fiducial GSMF agrees with the literature at $z<13.5$, we find that the assumed SFH model has a large impact on the GSMF and stellar mass density (SMD), finding a 0.75~dex increase in the SMD at $z=10.5$ between a flexible non-parametric and standard parametric SFH. Overall, we find a flatter SMD evolution at $z \geq 9$ than some studies predict, suggesting a rapid buildup of stellar mass in the early Universe. We find no incompatibility between our results and those of standard cosmological models, as suggested previously, although the most massive galaxies may require a high star formation efficiency. We find that the "Little Red Dot" galaxies dominate the $z=7$ GSMF at high-masses, necessitating a better understanding of the relative contributions of AGN and stellar emission. We show that assuming a theoretically motivated top-heavy IMF reduces stellar mass by 0.5~dex without affecting fit quality, but our results remain consistent with existing cosmological models with a standard IMF. |
| title | EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.03908 |