The Size-Mass relation at Rest-Frame $1.5μ$m from JWST/NIRCam in the COSMOS-WEB and PRIMER-COSMOS fields
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| Format: | Preprint |
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2024
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| _version_ | 1866929483133485056 |
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| author | Martorano, Marco van der Wel, Arjen Baes, Maarten Bell, Eric F. Brammer, Gabriel Franx, Marijn Nersesian, Angelos |
| author_facet | Martorano, Marco van der Wel, Arjen Baes, Maarten Bell, Eric F. Brammer, Gabriel Franx, Marijn Nersesian, Angelos |
| contents | We present the galaxy stellar mass - size relation in the rest-frame near-IR ($1.5~μ{\text{m}}$) and its evolution with redshift up to $z=2.5$. Sérsic profiles are measured for $\sim$ $26\,000$ galaxies with stellar masses $M_\star > 10^9~{\text{M}}_\odot$ from JWST/NIRCam F277W and F444W imaging provided by the COSMOS-WEB and PRIMER surveys, using coordinates, redshifts, colors and stellar mass estimates from the COSMOS2020 catalog. The new rest-frame near-IR effective radii are generally smaller than previously measured rest-frame optical sizes, on average by 0.14~dex, with no significant dependence on redshift. For quiescent galaxies this size offset does not depend on stellar mass, but for star-forming galaxies the offset increases from -0.1~dex at $M_\star = 10^{9.5}~{\text{M}}_\odot$ to -0.25~dex at $M_\star > 10^{11}~{\text{M}}_\odot$. That is, we find that the near-IR stellar mass - size relation for star-forming galaxies is flatter in the rest-frame near-IR than in the rest-frame optical at all redshifts $0.5<z<2.5$. The general pace of size evolution is the same in the near-IR as previously demonstrated in the optical, with slower evolution ($R_{\text{e}} \propto (1+z)^{-0.7}$) for $L^*$~star-forming galaxies and faster evolution ($R_{\text{e}} \propto (1+z)^{-1.3}$) for $L^*$~quiescent galaxies. Massive ($M_\star>10^{11}~{\text{M}}_\odot$) star-forming galaxies evolve in size almost as fast as quiescent galaxies. Low-mass ($M_\star<10^{10}~{\text{M}}_\odot$)~quiescent galaxies evolve as slow as star-forming galaxies. Our main conclusion is that the size evolution narrative as it has emerged over the past two decades does not radically change when accessing with JWST the rest-frame near-IR, a better proxy of the underlying stellar mass distribution. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_17756 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Size-Mass relation at Rest-Frame $1.5μ$m from JWST/NIRCam in the COSMOS-WEB and PRIMER-COSMOS fields Martorano, Marco van der Wel, Arjen Baes, Maarten Bell, Eric F. Brammer, Gabriel Franx, Marijn Nersesian, Angelos Astrophysics of Galaxies We present the galaxy stellar mass - size relation in the rest-frame near-IR ($1.5~μ{\text{m}}$) and its evolution with redshift up to $z=2.5$. Sérsic profiles are measured for $\sim$ $26\,000$ galaxies with stellar masses $M_\star > 10^9~{\text{M}}_\odot$ from JWST/NIRCam F277W and F444W imaging provided by the COSMOS-WEB and PRIMER surveys, using coordinates, redshifts, colors and stellar mass estimates from the COSMOS2020 catalog. The new rest-frame near-IR effective radii are generally smaller than previously measured rest-frame optical sizes, on average by 0.14~dex, with no significant dependence on redshift. For quiescent galaxies this size offset does not depend on stellar mass, but for star-forming galaxies the offset increases from -0.1~dex at $M_\star = 10^{9.5}~{\text{M}}_\odot$ to -0.25~dex at $M_\star > 10^{11}~{\text{M}}_\odot$. That is, we find that the near-IR stellar mass - size relation for star-forming galaxies is flatter in the rest-frame near-IR than in the rest-frame optical at all redshifts $0.5<z<2.5$. The general pace of size evolution is the same in the near-IR as previously demonstrated in the optical, with slower evolution ($R_{\text{e}} \propto (1+z)^{-0.7}$) for $L^*$~star-forming galaxies and faster evolution ($R_{\text{e}} \propto (1+z)^{-1.3}$) for $L^*$~quiescent galaxies. Massive ($M_\star>10^{11}~{\text{M}}_\odot$) star-forming galaxies evolve in size almost as fast as quiescent galaxies. Low-mass ($M_\star<10^{10}~{\text{M}}_\odot$)~quiescent galaxies evolve as slow as star-forming galaxies. Our main conclusion is that the size evolution narrative as it has emerged over the past two decades does not radically change when accessing with JWST the rest-frame near-IR, a better proxy of the underlying stellar mass distribution. |
| title | The Size-Mass relation at Rest-Frame $1.5μ$m from JWST/NIRCam in the COSMOS-WEB and PRIMER-COSMOS fields |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.17756 |