Two rest-frame wavelength measurements of galaxy sizes at $z<1$: the evolutionary effects of emerging bulges and quenched newcomers
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| Format: | Preprint |
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2024
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| _version_ | 1866911756837715968 |
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| author | George, Angelo Damjanov, Ivana Sawicki, Marcin Arnouts, Stéphane Desprez, Guillaume Gwyn, Stephen Picouet, Vincent Birrer, Simon Silverman, John |
| author_facet | George, Angelo Damjanov, Ivana Sawicki, Marcin Arnouts, Stéphane Desprez, Guillaume Gwyn, Stephen Picouet, Vincent Birrer, Simon Silverman, John |
| contents | We analyze the size evolution of $16000$ star-forming galaxies (SFGs) and $5000$ quiescent galaxies (QGs) with mass $M_*>10^{9.5}M_\odot$ at $0.1<z<0.9$ from the COSMOS field using deep CLAUDS+HSC imaging in two rest-frame wavelengths, $3000$Å (UV light) and $5000$Å (visible light). With half-light radius ($R_e$) as proxy for size, SFGs at characteristic mass $M_0 = 5\times10^{10}M_\odot$ grow by $20\%$ ($30\%$) in UV (visible) light since $z\sim1$ and the strength of their size evolution increases with stellar mass. After accounting for mass growth due to star formation, we estimate that SFGs grow by $75\%$ in all stellar mass bins and in both rest-frame wavelengths. Redder SFGs are more massive, smaller and more concentrated than bluer SFGs and the fraction of red SFGs increases with time. These results point to the emergence of bulges as the dominant mechanism for the average size growth of SFGs. We find two threshold values for the stellar mass density within central $1$kpc ($Σ_1$): all SFGs with $\logΣ_1 > 9$ are red and only QGs have $\logΣ_1>9.7$. The size of $M_*=M_0$ QGs grows by $50\%$ ($110\%$) in the UV (visible) light. Up to $\sim20\%$ of this increase in size of massive QGs is due to newcomers (recently quenched galaxies). However, newcomers cannot explain the observed pace in the size growth of QGs; that trend has to be dominated by processes affecting individual galaxies, such as minor mergers and accretion. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_06842 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two rest-frame wavelength measurements of galaxy sizes at $z<1$: the evolutionary effects of emerging bulges and quenched newcomers George, Angelo Damjanov, Ivana Sawicki, Marcin Arnouts, Stéphane Desprez, Guillaume Gwyn, Stephen Picouet, Vincent Birrer, Simon Silverman, John Astrophysics of Galaxies Instrumentation and Methods for Astrophysics We analyze the size evolution of $16000$ star-forming galaxies (SFGs) and $5000$ quiescent galaxies (QGs) with mass $M_*>10^{9.5}M_\odot$ at $0.1<z<0.9$ from the COSMOS field using deep CLAUDS+HSC imaging in two rest-frame wavelengths, $3000$Å (UV light) and $5000$Å (visible light). With half-light radius ($R_e$) as proxy for size, SFGs at characteristic mass $M_0 = 5\times10^{10}M_\odot$ grow by $20\%$ ($30\%$) in UV (visible) light since $z\sim1$ and the strength of their size evolution increases with stellar mass. After accounting for mass growth due to star formation, we estimate that SFGs grow by $75\%$ in all stellar mass bins and in both rest-frame wavelengths. Redder SFGs are more massive, smaller and more concentrated than bluer SFGs and the fraction of red SFGs increases with time. These results point to the emergence of bulges as the dominant mechanism for the average size growth of SFGs. We find two threshold values for the stellar mass density within central $1$kpc ($Σ_1$): all SFGs with $\logΣ_1 > 9$ are red and only QGs have $\logΣ_1>9.7$. The size of $M_*=M_0$ QGs grows by $50\%$ ($110\%$) in the UV (visible) light. Up to $\sim20\%$ of this increase in size of massive QGs is due to newcomers (recently quenched galaxies). However, newcomers cannot explain the observed pace in the size growth of QGs; that trend has to be dominated by processes affecting individual galaxies, such as minor mergers and accretion. |
| title | Two rest-frame wavelength measurements of galaxy sizes at $z<1$: the evolutionary effects of emerging bulges and quenched newcomers |
| topic | Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2401.06842 |