Unveiling the Cosmic Gems Arc at $z\sim10$ with JWST NIRCam
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| Format: | Preprint |
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2024
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| author | Bradley, Larry D. Adamo, Angela Vanzella, Eros Sharon, Keren Brammer, Gabriel Coe, Dan Diego, Jose M. Kokorev, Vasily Mahler, Guillaume Oguri, Masamune Abdurro'uf Bhatawdekar, Rachana Christensen, Lise Fujimoto, Seiji Hashimoto, Takuya Hsiao, Tiger Y. -Y Inoue, Akio K. Jiménez-Teja, Yolanda Messa, Matteo Norman, Colin Ricotti, Massimo Tamura, Yoichi Windhorst, Rogier A. Xu, Xinfeng Zitrin, Adi |
| author_facet | Bradley, Larry D. Adamo, Angela Vanzella, Eros Sharon, Keren Brammer, Gabriel Coe, Dan Diego, Jose M. Kokorev, Vasily Mahler, Guillaume Oguri, Masamune Abdurro'uf Bhatawdekar, Rachana Christensen, Lise Fujimoto, Seiji Hashimoto, Takuya Hsiao, Tiger Y. -Y Inoue, Akio K. Jiménez-Teja, Yolanda Messa, Matteo Norman, Colin Ricotti, Massimo Tamura, Yoichi Windhorst, Rogier A. Xu, Xinfeng Zitrin, Adi |
| contents | We present recent JWST NIRCam imaging observations of SPT0615-JD (also known as the Cosmic Gems Arc), lensed by the galaxy cluster SPT-CL J0615-5746. The 5 arcsec long arc is the most highly magnified $z>10$ galaxy known. It straddles the lensing critical curve and reveals five star clusters with radii of $\sim 1$ pc or less. We measure the full arc to have F200W 24.5 AB mag, consisting of two mirror images, each 25.3 AB mag with a median magnification of $μ\sim 60^{+17}_{-8}$ (delensed 29.7 AB mag, $M_{UV} = -17.8$). The galaxy has an extremely strong Lyman break F115W$-$F200W $>3.2$ mag ($2σ$ lower limit), is undetected in all bluer filters ($< 2σ$), and has a very blue continuum slope redward of the break ($β= -2.7 \pm 0.1$). This results in a photometric redshift $z_{phot} = 10.2 \pm 0.2$ (95% confidence) with no significant likelihood below $z<9.8$. Based on spectral energy distribution fitting to the total photometry, we estimate an intrinsic stellar mass of $M_{*} \sim 2.4 - 5.6 \times 10^{7} M_{\odot}$, young mass-weighted age of $\sim 21 - 79$ Myr, low dust content ($A_V < 0.15$), and a low metallicity of $\lesssim 1\%~Z_{\odot}$. We identify a fainter third counterimage candidate within 2.2 arcsec of the predicted position, lensed to AB mag 28.4 and magnified by $μ\sim 2$, suggesting the fold arc may only show $\sim 60$% of the galaxy. SPT0615-JD is a unique laboratory to study star clusters observed within a galaxy just 460 Myr after the Big Bang. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_10770 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Unveiling the Cosmic Gems Arc at $z\sim10$ with JWST NIRCam Bradley, Larry D. Adamo, Angela Vanzella, Eros Sharon, Keren Brammer, Gabriel Coe, Dan Diego, Jose M. Kokorev, Vasily Mahler, Guillaume Oguri, Masamune Abdurro'uf Bhatawdekar, Rachana Christensen, Lise Fujimoto, Seiji Hashimoto, Takuya Hsiao, Tiger Y. -Y Inoue, Akio K. Jiménez-Teja, Yolanda Messa, Matteo Norman, Colin Ricotti, Massimo Tamura, Yoichi Windhorst, Rogier A. Xu, Xinfeng Zitrin, Adi Astrophysics of Galaxies We present recent JWST NIRCam imaging observations of SPT0615-JD (also known as the Cosmic Gems Arc), lensed by the galaxy cluster SPT-CL J0615-5746. The 5 arcsec long arc is the most highly magnified $z>10$ galaxy known. It straddles the lensing critical curve and reveals five star clusters with radii of $\sim 1$ pc or less. We measure the full arc to have F200W 24.5 AB mag, consisting of two mirror images, each 25.3 AB mag with a median magnification of $μ\sim 60^{+17}_{-8}$ (delensed 29.7 AB mag, $M_{UV} = -17.8$). The galaxy has an extremely strong Lyman break F115W$-$F200W $>3.2$ mag ($2σ$ lower limit), is undetected in all bluer filters ($< 2σ$), and has a very blue continuum slope redward of the break ($β= -2.7 \pm 0.1$). This results in a photometric redshift $z_{phot} = 10.2 \pm 0.2$ (95% confidence) with no significant likelihood below $z<9.8$. Based on spectral energy distribution fitting to the total photometry, we estimate an intrinsic stellar mass of $M_{*} \sim 2.4 - 5.6 \times 10^{7} M_{\odot}$, young mass-weighted age of $\sim 21 - 79$ Myr, low dust content ($A_V < 0.15$), and a low metallicity of $\lesssim 1\%~Z_{\odot}$. We identify a fainter third counterimage candidate within 2.2 arcsec of the predicted position, lensed to AB mag 28.4 and magnified by $μ\sim 2$, suggesting the fold arc may only show $\sim 60$% of the galaxy. SPT0615-JD is a unique laboratory to study star clusters observed within a galaxy just 460 Myr after the Big Bang. |
| title | Unveiling the Cosmic Gems Arc at $z\sim10$ with JWST NIRCam |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.10770 |