COSMOS Web: Morphological quenching and size-mass evolution of brightest group galaxies from z = 3.7
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| Format: | Preprint |
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2025
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| author | Gozaliasl, Ghassem Yang, Lilan Kartaltepe, Jeyhan Toni, Greta Abedini, Fatemeh Akins, Hollis Allen, Natalie Arango-Toro, Rafael Babul, Arif Casey, Caitlin Chartab, Nima Drakos, Nicole Faisst, Andreas Finoguenov, Alexis Flayhart, Carter Franco, Maximilien Leroy, Gavin Harish, Santosh Hasinger, Günther Hatamnia, Hossein Ilbert, Olivier Jin, Shuowen Kakkad, Darshan Kalantari, Atousa Khostovan, Ali Ahmad Koekemoer, Anton Korpi-Lagg, Maarit Laigle, Clotilde Liu, Daizhong Magdis, Georgios Maturi, Matteo McCracken, Henry Joy McKinney, Jed McMahon, Nicolas Mobasher, Bahram Moscardini, Lauro Rhodes, Jason Robertson, Brant Paquereau, Louise Puglisi, Annagrazia Samir, Rasha Sargent, Mark Sattari, Zahra Scognamiglio, Diana Scoville, Nick Shuntov, Marko Sanders, David Taamoli, Sina Toft, Sune Vardoulaki, Eleni |
| author_facet | Gozaliasl, Ghassem Yang, Lilan Kartaltepe, Jeyhan Toni, Greta Abedini, Fatemeh Akins, Hollis Allen, Natalie Arango-Toro, Rafael Babul, Arif Casey, Caitlin Chartab, Nima Drakos, Nicole Faisst, Andreas Finoguenov, Alexis Flayhart, Carter Franco, Maximilien Leroy, Gavin Harish, Santosh Hasinger, Günther Hatamnia, Hossein Ilbert, Olivier Jin, Shuowen Kakkad, Darshan Kalantari, Atousa Khostovan, Ali Ahmad Koekemoer, Anton Korpi-Lagg, Maarit Laigle, Clotilde Liu, Daizhong Magdis, Georgios Maturi, Matteo McCracken, Henry Joy McKinney, Jed McMahon, Nicolas Mobasher, Bahram Moscardini, Lauro Rhodes, Jason Robertson, Brant Paquereau, Louise Puglisi, Annagrazia Samir, Rasha Sargent, Mark Sattari, Zahra Scognamiglio, Diana Scoville, Nick Shuntov, Marko Sanders, David Taamoli, Sina Toft, Sune Vardoulaki, Eleni |
| contents | We present a comprehensive study of the structural evolution of Brightest Group Galaxies (BGGs) from redshift $z \simeq 0.08$ to $z = 3.7$ using the \textit{James Webb Space Telescope}'s 255h COSMOS-Web program. This survey provides deep NIRCam imaging in four filters (F115W, F150W, F277W, F444W) across $\sim 0.54~\mathrm{deg}^2$ and MIRI coverage in $\sim 0.2~\mathrm{deg}^2$ of the COSMOS field. High-resolution NIRCam imaging enables robust size and morphological measurements, while multiwavelength photometry yields stellar masses, SFRs, and Sérsic parameters. We classify BGGs as star-forming and quiescent using both rest-frame NUV--$r$--$J$ colors and a redshift-dependent specific star formation rate (sSFR) threshold. Our analysis reveals: (1) quiescent BGGs are systematically more compact than their star-forming counterparts and exhibit steeper size--mass slopes; (2) effective radii evolve as $R_e \propto (1+z)^{-α}$, with $α= 1.11 \pm 0.07$ (star-forming) and $1.40 \pm 0.09$ (quiescent); (3) star formation surface density ($Σ_{\mathrm{SFR}}$) increases with redshift and shows stronger evolution for massive BGGs ($\log_{10}(M_\ast/M_\odot) \geq 10.75$); (4) in the $Σ_*$--sSFR plane, a structural transition marks the quenching process, with bulge-dominated systems comprising over 80\% of the quiescent population. These results highlight the co-evolution of structure and star formation in BGGs, shaped by both internal and environmental processes, and establish BGGs as critical laboratories for studying the baryonic assembly and morphological transformation of central galaxies in group-scale halos. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04031 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | COSMOS Web: Morphological quenching and size-mass evolution of brightest group galaxies from z = 3.7 Gozaliasl, Ghassem Yang, Lilan Kartaltepe, Jeyhan Toni, Greta Abedini, Fatemeh Akins, Hollis Allen, Natalie Arango-Toro, Rafael Babul, Arif Casey, Caitlin Chartab, Nima Drakos, Nicole Faisst, Andreas Finoguenov, Alexis Flayhart, Carter Franco, Maximilien Leroy, Gavin Harish, Santosh Hasinger, Günther Hatamnia, Hossein Ilbert, Olivier Jin, Shuowen Kakkad, Darshan Kalantari, Atousa Khostovan, Ali Ahmad Koekemoer, Anton Korpi-Lagg, Maarit Laigle, Clotilde Liu, Daizhong Magdis, Georgios Maturi, Matteo McCracken, Henry Joy McKinney, Jed McMahon, Nicolas Mobasher, Bahram Moscardini, Lauro Rhodes, Jason Robertson, Brant Paquereau, Louise Puglisi, Annagrazia Samir, Rasha Sargent, Mark Sattari, Zahra Scognamiglio, Diana Scoville, Nick Shuntov, Marko Sanders, David Taamoli, Sina Toft, Sune Vardoulaki, Eleni Astrophysics of Galaxies 85A40, 68T07 J.2; I.2.6 We present a comprehensive study of the structural evolution of Brightest Group Galaxies (BGGs) from redshift $z \simeq 0.08$ to $z = 3.7$ using the \textit{James Webb Space Telescope}'s 255h COSMOS-Web program. This survey provides deep NIRCam imaging in four filters (F115W, F150W, F277W, F444W) across $\sim 0.54~\mathrm{deg}^2$ and MIRI coverage in $\sim 0.2~\mathrm{deg}^2$ of the COSMOS field. High-resolution NIRCam imaging enables robust size and morphological measurements, while multiwavelength photometry yields stellar masses, SFRs, and Sérsic parameters. We classify BGGs as star-forming and quiescent using both rest-frame NUV--$r$--$J$ colors and a redshift-dependent specific star formation rate (sSFR) threshold. Our analysis reveals: (1) quiescent BGGs are systematically more compact than their star-forming counterparts and exhibit steeper size--mass slopes; (2) effective radii evolve as $R_e \propto (1+z)^{-α}$, with $α= 1.11 \pm 0.07$ (star-forming) and $1.40 \pm 0.09$ (quiescent); (3) star formation surface density ($Σ_{\mathrm{SFR}}$) increases with redshift and shows stronger evolution for massive BGGs ($\log_{10}(M_\ast/M_\odot) \geq 10.75$); (4) in the $Σ_*$--sSFR plane, a structural transition marks the quenching process, with bulge-dominated systems comprising over 80\% of the quiescent population. These results highlight the co-evolution of structure and star formation in BGGs, shaped by both internal and environmental processes, and establish BGGs as critical laboratories for studying the baryonic assembly and morphological transformation of central galaxies in group-scale halos. |
| title | COSMOS Web: Morphological quenching and size-mass evolution of brightest group galaxies from z = 3.7 |
| topic | Astrophysics of Galaxies 85A40, 68T07 J.2; I.2.6 |
| url | https://arxiv.org/abs/2506.04031 |