A Steep Decline in the Galaxy Space Density Beyond Redshift 9 in the CANUCS UV Luminosity Function
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2023
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| author | Willott, Chris J. Desprez, Guillaume Asada, Yoshihisa Sarrouh, Ghassan T. E. Abraham, Roberto Bradač, Maruša Brammer, Gabe Estrada-Carpenter, Vince Iyer, Kartheik G. Martis, Nicholas S. Matharu, Jasleen Mowla, Lamiya Muzzin, Adam Noirot, Gaël Sawicki, Marcin Strait, Victoria Rihtaršič, Gregor Withers, Sunna |
| author_facet | Willott, Chris J. Desprez, Guillaume Asada, Yoshihisa Sarrouh, Ghassan T. E. Abraham, Roberto Bradač, Maruša Brammer, Gabe Estrada-Carpenter, Vince Iyer, Kartheik G. Martis, Nicholas S. Matharu, Jasleen Mowla, Lamiya Muzzin, Adam Noirot, Gaël Sawicki, Marcin Strait, Victoria Rihtaršič, Gregor Withers, Sunna |
| contents | We present a new sample of 158 galaxies at redshift $z>7.5$ selected from deep \jwst\ NIRCam imaging of five widely-separated sightlines in the CANUCS survey. Two-thirds of the pointings and 80\% of the galaxies are covered by 12 to 14 NIRCam filters, including seven to nine medium bands, providing accurate photometric redshifts and robustness against low redshift interlopers. A sample of 28 galaxies at $z>7.5$ with spectroscopic redshifts shows a low systematic offset and scatter in the difference between photometric and spectroscopic redshifts. We derive the galaxy UV luminosity function at redshifts 8 to 12, finding a slightly higher normalization than previously seen with \hst\ at redshifts 8 to 10. We observe a steeper decline in the galaxy space density from $z=8$ to $12$ than found by most \jwst\ Cycle 1 studies. In particular, we find only eight galaxies at $z>10$ and none at $z>12.5$, with no $z>10$ galaxies brighter than F277W AB=28 or $M_{\rm UV}=-20$ in our unmasked, delensed survey area of 53.4 square arcminutes. We attribute the lack of bright $z>10$ galaxies in CANUCS compared to GLASS and CEERS to intrinsic variance in the galaxy density along different sightlines. The evolution in the CANUCS luminosity function between $z=8$ and $12$ is comparable to that predicted by simulations that assume a standard star formation efficiency, without invoking any special adjustments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_12234 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A Steep Decline in the Galaxy Space Density Beyond Redshift 9 in the CANUCS UV Luminosity Function Willott, Chris J. Desprez, Guillaume Asada, Yoshihisa Sarrouh, Ghassan T. E. Abraham, Roberto Bradač, Maruša Brammer, Gabe Estrada-Carpenter, Vince Iyer, Kartheik G. Martis, Nicholas S. Matharu, Jasleen Mowla, Lamiya Muzzin, Adam Noirot, Gaël Sawicki, Marcin Strait, Victoria Rihtaršič, Gregor Withers, Sunna Astrophysics of Galaxies We present a new sample of 158 galaxies at redshift $z>7.5$ selected from deep \jwst\ NIRCam imaging of five widely-separated sightlines in the CANUCS survey. Two-thirds of the pointings and 80\% of the galaxies are covered by 12 to 14 NIRCam filters, including seven to nine medium bands, providing accurate photometric redshifts and robustness against low redshift interlopers. A sample of 28 galaxies at $z>7.5$ with spectroscopic redshifts shows a low systematic offset and scatter in the difference between photometric and spectroscopic redshifts. We derive the galaxy UV luminosity function at redshifts 8 to 12, finding a slightly higher normalization than previously seen with \hst\ at redshifts 8 to 10. We observe a steeper decline in the galaxy space density from $z=8$ to $12$ than found by most \jwst\ Cycle 1 studies. In particular, we find only eight galaxies at $z>10$ and none at $z>12.5$, with no $z>10$ galaxies brighter than F277W AB=28 or $M_{\rm UV}=-20$ in our unmasked, delensed survey area of 53.4 square arcminutes. We attribute the lack of bright $z>10$ galaxies in CANUCS compared to GLASS and CEERS to intrinsic variance in the galaxy density along different sightlines. The evolution in the CANUCS luminosity function between $z=8$ and $12$ is comparable to that predicted by simulations that assume a standard star formation efficiency, without invoking any special adjustments. |
| title | A Steep Decline in the Galaxy Space Density Beyond Redshift 9 in the CANUCS UV Luminosity Function |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2311.12234 |