JWST UNCOVER: The Overabundance of Ultraviolet-luminous Galaxies at $z>9$
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929437750067200 |
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| author | Chemerynska, Iryna Atek, Hakim Furtak, Lukas J. Zitrin, Adi Greene, Jenny E. Dayal, Pratika Weibel, Andrea Fujimoto, Seiji Kokorev, Vasily Goulding, Andy D. Williams, Christina C. Nanayakkara, Themiya Bezanson, Rachel Brammer, Gabriel Cutler, Sam E. Labbe, Ivo Leja, Joel Pan, Richard Price, Sedona H. van Dokkum, Pieter Wang, Bingjie Weaver, John R. Whitaker, Katherine E. |
| author_facet | Chemerynska, Iryna Atek, Hakim Furtak, Lukas J. Zitrin, Adi Greene, Jenny E. Dayal, Pratika Weibel, Andrea Fujimoto, Seiji Kokorev, Vasily Goulding, Andy D. Williams, Christina C. Nanayakkara, Themiya Bezanson, Rachel Brammer, Gabriel Cutler, Sam E. Labbe, Ivo Leja, Joel Pan, Richard Price, Sedona H. van Dokkum, Pieter Wang, Bingjie Weaver, John R. Whitaker, Katherine E. |
| contents | Over the past year, JWST has uncovered galaxies at record-breaking distances up to $z \sim 13$. The JWST UNCOVER (ultra-deep NIRSpec and NIRcam observations before the epoch of reionization) program has obtained ultra-deep multiwavelength NIRCam imaging of the massive galaxy cluster Abell 2744 over $\sim 45$ arcmin$^{2}$ down to $\sim 29.5$ AB mag. Here, we present a robust ultraviolet (UV) luminosity function derived through lensing clusters at $9<z<12$. Using comprehensive end-to-end simulations, we account for all lensing effects and systematic uncertainties in deriving both the amplification factors and the effective survey volume. Our results confirm the intriguing excess of UV-bright galaxies ($M_{UV} < -20$ AB mag) previously reported at $z>9$ in recent JWST studies. In particular, a double power-law (DPL) describes better the bright-end of the luminosity function compared to the classical Schechter form. The number density of these bright galaxies is 10-100 times larger than theoretical predictions and previous findings based on Hubble Space Telescope (HST) observations. Additionally, we measure a star formation rate density of $ρ_{\rm SFR} = 10^{-2.64}$ M$_{\odot}$~yr$^{-1}$~Mpc$^{-3}$ at these redshifts, which is 4 to 10 times higher than galaxy formation models that assume a constant star formation efficiency. Future wide-area surveys and accurate modeling of lensing-assisted observations will reliably constrain both the bright and the dim end of the UV luminosity function at $z>9$, which will provide key benchmarks for galaxy formation models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_05030 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | JWST UNCOVER: The Overabundance of Ultraviolet-luminous Galaxies at $z>9$ Chemerynska, Iryna Atek, Hakim Furtak, Lukas J. Zitrin, Adi Greene, Jenny E. Dayal, Pratika Weibel, Andrea Fujimoto, Seiji Kokorev, Vasily Goulding, Andy D. Williams, Christina C. Nanayakkara, Themiya Bezanson, Rachel Brammer, Gabriel Cutler, Sam E. Labbe, Ivo Leja, Joel Pan, Richard Price, Sedona H. van Dokkum, Pieter Wang, Bingjie Weaver, John R. Whitaker, Katherine E. Astrophysics of Galaxies Over the past year, JWST has uncovered galaxies at record-breaking distances up to $z \sim 13$. The JWST UNCOVER (ultra-deep NIRSpec and NIRcam observations before the epoch of reionization) program has obtained ultra-deep multiwavelength NIRCam imaging of the massive galaxy cluster Abell 2744 over $\sim 45$ arcmin$^{2}$ down to $\sim 29.5$ AB mag. Here, we present a robust ultraviolet (UV) luminosity function derived through lensing clusters at $9<z<12$. Using comprehensive end-to-end simulations, we account for all lensing effects and systematic uncertainties in deriving both the amplification factors and the effective survey volume. Our results confirm the intriguing excess of UV-bright galaxies ($M_{UV} < -20$ AB mag) previously reported at $z>9$ in recent JWST studies. In particular, a double power-law (DPL) describes better the bright-end of the luminosity function compared to the classical Schechter form. The number density of these bright galaxies is 10-100 times larger than theoretical predictions and previous findings based on Hubble Space Telescope (HST) observations. Additionally, we measure a star formation rate density of $ρ_{\rm SFR} = 10^{-2.64}$ M$_{\odot}$~yr$^{-1}$~Mpc$^{-3}$ at these redshifts, which is 4 to 10 times higher than galaxy formation models that assume a constant star formation efficiency. Future wide-area surveys and accurate modeling of lensing-assisted observations will reliably constrain both the bright and the dim end of the UV luminosity function at $z>9$, which will provide key benchmarks for galaxy formation models. |
| title | JWST UNCOVER: The Overabundance of Ultraviolet-luminous Galaxies at $z>9$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2312.05030 |