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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.18248 |
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| _version_ | 1866911275789844480 |
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| author | Tsujita, Akiyoshi Fujimoto, Seiji Faisst, Andreas Boquien, Meédéric Li, Juno Ferrara, Andrea Battisti, Andrew J. Dam, Poulomi Aravena, Manuel Béthermin, Matthieu Casey, Caitlin M. Cooper, Olivia R. Finkelstein, Steven L. Ginolfi, Michele Gómez-Espinoza, Diego A. Hadi, Ali Herrera-Camus, Rodrigo Ibar, Edo Inami, Hanae Jones, Gareth C. Koekemoer, Anton M. Kohno, Kotaro Lemaux, Brian C. De Looze, Ilse Mitsuhashi, Ikki Molina, Juan Nanni, Ambra Pozzi, Francesca Reddy, Naveen A. Relano, Monica Rodighiero, Giulia Romano, Michael Sanders, David B. Sawant, Prasad Solimano, Manuel Sommovigo, Laura Spilker, Justin Tadaki, Ken-ichi Vallini, Livia Villanueva, Vicente Wang, Wuji Zamorani, Giovanni |
| author_facet | Tsujita, Akiyoshi Fujimoto, Seiji Faisst, Andreas Boquien, Meédéric Li, Juno Ferrara, Andrea Battisti, Andrew J. Dam, Poulomi Aravena, Manuel Béthermin, Matthieu Casey, Caitlin M. Cooper, Olivia R. Finkelstein, Steven L. Ginolfi, Michele Gómez-Espinoza, Diego A. Hadi, Ali Herrera-Camus, Rodrigo Ibar, Edo Inami, Hanae Jones, Gareth C. Koekemoer, Anton M. Kohno, Kotaro Lemaux, Brian C. De Looze, Ilse Mitsuhashi, Ikki Molina, Juan Nanni, Ambra Pozzi, Francesca Reddy, Naveen A. Relano, Monica Rodighiero, Giulia Romano, Michael Sanders, David B. Sawant, Prasad Solimano, Manuel Sommovigo, Laura Spilker, Justin Tadaki, Ken-ichi Vallini, Livia Villanueva, Vicente Wang, Wuji Zamorani, Giovanni |
| contents | Characterizing dust attenuation is crucial for revealing the intrinsic physical properties of galaxies. We present an analysis of dust attenuation in 18 spectroscopically confirmed star-forming main-sequence galaxies at $z = 4.4-5.7$ observed with JWST/NIRSpec IFU and NIRCam, selected from the ALPINE and CRISTAL ALMA large programs. We fit the emission line fluxes from NIRSpec and the broad-band photometry from NIRCam with Prospector, using both spatially integrated emission and $\sim0.6$ kpc pixel-by-pixel measurements. We derive the stellar-to-nebular dust attenuation ratio ($f=E(B-V)_{\mathrm{star}}/E(B-V)_{\mathrm{neb}}$) from the SED fits and the Balmer decrement with H$α$ and H$β$. Although individual galaxies show large scatter, the best-fit value is $f = 0.51^{+0.04}_{-0.03}$, slightly higher than that measured for local starburst galaxies. We find weak correlations of $f$ with galaxy properties, increasing with higher specific star-formation rates, younger stellar ages, and more recent star-formation. For the range of $E(B-V)_{\mathrm{star}} = 0.009-0.15$ mag for in our sample, assuming $f = 1$ (often adopted in high-redshift studies) instead of $f = 0.51$ underestimate line luminosities and ionizing photon production efficiency $ξ_\text{ion}$ by $\sim3-36\%$ and $\sim4-46\%$, respectively. We also find that the total stellar masses estimated from spatially-integrated SED fits with a delayed-$τ$ star-formation histories are systematically smaller than the sum of pixel-by-pixel SED fits, with a median offset of $\sim 0.26$ dex, likely because the integrated fits are biased toward luminous young stellar populations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_18248 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The ALPINE-CRISTAL-JWST Survey: Stellar and nebular dust attenuation of main-sequence galaxies at z~4-6 Tsujita, Akiyoshi Fujimoto, Seiji Faisst, Andreas Boquien, Meédéric Li, Juno Ferrara, Andrea Battisti, Andrew J. Dam, Poulomi Aravena, Manuel Béthermin, Matthieu Casey, Caitlin M. Cooper, Olivia R. Finkelstein, Steven L. Ginolfi, Michele Gómez-Espinoza, Diego A. Hadi, Ali Herrera-Camus, Rodrigo Ibar, Edo Inami, Hanae Jones, Gareth C. Koekemoer, Anton M. Kohno, Kotaro Lemaux, Brian C. De Looze, Ilse Mitsuhashi, Ikki Molina, Juan Nanni, Ambra Pozzi, Francesca Reddy, Naveen A. Relano, Monica Rodighiero, Giulia Romano, Michael Sanders, David B. Sawant, Prasad Solimano, Manuel Sommovigo, Laura Spilker, Justin Tadaki, Ken-ichi Vallini, Livia Villanueva, Vicente Wang, Wuji Zamorani, Giovanni Astrophysics of Galaxies Characterizing dust attenuation is crucial for revealing the intrinsic physical properties of galaxies. We present an analysis of dust attenuation in 18 spectroscopically confirmed star-forming main-sequence galaxies at $z = 4.4-5.7$ observed with JWST/NIRSpec IFU and NIRCam, selected from the ALPINE and CRISTAL ALMA large programs. We fit the emission line fluxes from NIRSpec and the broad-band photometry from NIRCam with Prospector, using both spatially integrated emission and $\sim0.6$ kpc pixel-by-pixel measurements. We derive the stellar-to-nebular dust attenuation ratio ($f=E(B-V)_{\mathrm{star}}/E(B-V)_{\mathrm{neb}}$) from the SED fits and the Balmer decrement with H$α$ and H$β$. Although individual galaxies show large scatter, the best-fit value is $f = 0.51^{+0.04}_{-0.03}$, slightly higher than that measured for local starburst galaxies. We find weak correlations of $f$ with galaxy properties, increasing with higher specific star-formation rates, younger stellar ages, and more recent star-formation. For the range of $E(B-V)_{\mathrm{star}} = 0.009-0.15$ mag for in our sample, assuming $f = 1$ (often adopted in high-redshift studies) instead of $f = 0.51$ underestimate line luminosities and ionizing photon production efficiency $ξ_\text{ion}$ by $\sim3-36\%$ and $\sim4-46\%$, respectively. We also find that the total stellar masses estimated from spatially-integrated SED fits with a delayed-$τ$ star-formation histories are systematically smaller than the sum of pixel-by-pixel SED fits, with a median offset of $\sim 0.26$ dex, likely because the integrated fits are biased toward luminous young stellar populations. |
| title | The ALPINE-CRISTAL-JWST Survey: Stellar and nebular dust attenuation of main-sequence galaxies at z~4-6 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.18248 |