A First Look at Spatially Resolved Star Formation at $4.8<z<6.5$ with JWST FRESCO NIRCam Slitless Spectroscopy
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909331610402816 |
|---|---|
| author | Matharu, Jasleen Nelson, Erica J. Brammer, Gabriel Oesch, Pascal A. Allen, Natalie Shivaei, Irene Naidu, Rohan P. Chisholm, John Covelo-Paz, Alba Fudamoto, Yoshinobu Giovinazzo, Emma Herard-Demanche, Thomas Kerutt, Josephine Kramarenko, Ivan Marchesini, Danilo Meyer, Romain A. Prieto-Lyon, Gonzalo Reddy, Naveen Shuntov, Marko Weibel, Andrea Wuyts, Stijn Xiao, Mengyuan |
| author_facet | Matharu, Jasleen Nelson, Erica J. Brammer, Gabriel Oesch, Pascal A. Allen, Natalie Shivaei, Irene Naidu, Rohan P. Chisholm, John Covelo-Paz, Alba Fudamoto, Yoshinobu Giovinazzo, Emma Herard-Demanche, Thomas Kerutt, Josephine Kramarenko, Ivan Marchesini, Danilo Meyer, Romain A. Prieto-Lyon, Gonzalo Reddy, Naveen Shuntov, Marko Weibel, Andrea Wuyts, Stijn Xiao, Mengyuan |
| contents | We present the first results on the spatial distribution of star formation in 454 star-forming galaxies at $4.8<z<6.5$ using H-Alpha emission-line maps and F444W imaging tracing the stellar continuum from JWST FRESCO NIRCam Slitless Spectroscopy. Star-forming galaxies with stellar masses $6.8\leq$log($M_{*}/\mathrm{M}_{\odot}$)$<11.1$ have positive H-Alpha equivalent width profiles, providing direct evidence for the inside-out growth of galaxies just after the epoch of reionisation. GALFIT is used to calculate half-light radii, $R_{\mathrm{eff}}$ and central surface densities within 1 kiloparsec, $Σ_{1\mathrm{kpc}}$. At a fixed stellar mass of log$(M_{*}/\mathrm{M}_{\odot})=9.5$, $Σ_{1\mathrm{kpc, H}α}$ is $1.04\pm0.05$ times higher than $Σ_{1\mathrm{kpc, C}}$, $R_{\mathrm{eff, H}α}$ is $1.18\pm0.03$ times larger than $R_{\mathrm{eff, C}}$ and both $R_{\mathrm{eff}}$ measurements are less than 1 kiloparsec. These measurements suggest the rapid build-up of compact bulges just after the epoch of reionisation. By comparing to work done at lower redshifts with HST WFC3 Slitless Spectroscopy as part of the 3D-HST ($z=1$) and CLEAR ($z=0.5$) surveys, we find that $R_{\mathrm{eff}}(z)$ evolves at the same pace for H$α$ and the continuum, but $Σ_{1\mathrm{kpc}}(z)$ evolves faster for H$α$. As a function of the Hubble parameter, $\frac{R_{\mathrm{eff, H}α}}{R_{\mathrm{eff, C}}}=1.1h(z)$ and $\frac{Σ_{1\mathrm{kpc,H}α}}{Σ_{1\mathrm{kpc,C}}}=h(z)^{1.3}$. These functions suggest that the inside-out growth of the disk dominates the inside-out growth of the bulge towards lower redshifts. This is supported by the redshift evolution in EW(H$α$) profiles, where there is rapid increase in EW(H$α$) with radius within the half-light radius at $z=5.3$ but only significantly increasing EW(H$α$) with radius in the outer disk at $z=0.5$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_17629 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A First Look at Spatially Resolved Star Formation at $4.8<z<6.5$ with JWST FRESCO NIRCam Slitless Spectroscopy Matharu, Jasleen Nelson, Erica J. Brammer, Gabriel Oesch, Pascal A. Allen, Natalie Shivaei, Irene Naidu, Rohan P. Chisholm, John Covelo-Paz, Alba Fudamoto, Yoshinobu Giovinazzo, Emma Herard-Demanche, Thomas Kerutt, Josephine Kramarenko, Ivan Marchesini, Danilo Meyer, Romain A. Prieto-Lyon, Gonzalo Reddy, Naveen Shuntov, Marko Weibel, Andrea Wuyts, Stijn Xiao, Mengyuan Astrophysics of Galaxies We present the first results on the spatial distribution of star formation in 454 star-forming galaxies at $4.8<z<6.5$ using H-Alpha emission-line maps and F444W imaging tracing the stellar continuum from JWST FRESCO NIRCam Slitless Spectroscopy. Star-forming galaxies with stellar masses $6.8\leq$log($M_{*}/\mathrm{M}_{\odot}$)$<11.1$ have positive H-Alpha equivalent width profiles, providing direct evidence for the inside-out growth of galaxies just after the epoch of reionisation. GALFIT is used to calculate half-light radii, $R_{\mathrm{eff}}$ and central surface densities within 1 kiloparsec, $Σ_{1\mathrm{kpc}}$. At a fixed stellar mass of log$(M_{*}/\mathrm{M}_{\odot})=9.5$, $Σ_{1\mathrm{kpc, H}α}$ is $1.04\pm0.05$ times higher than $Σ_{1\mathrm{kpc, C}}$, $R_{\mathrm{eff, H}α}$ is $1.18\pm0.03$ times larger than $R_{\mathrm{eff, C}}$ and both $R_{\mathrm{eff}}$ measurements are less than 1 kiloparsec. These measurements suggest the rapid build-up of compact bulges just after the epoch of reionisation. By comparing to work done at lower redshifts with HST WFC3 Slitless Spectroscopy as part of the 3D-HST ($z=1$) and CLEAR ($z=0.5$) surveys, we find that $R_{\mathrm{eff}}(z)$ evolves at the same pace for H$α$ and the continuum, but $Σ_{1\mathrm{kpc}}(z)$ evolves faster for H$α$. As a function of the Hubble parameter, $\frac{R_{\mathrm{eff, H}α}}{R_{\mathrm{eff, C}}}=1.1h(z)$ and $\frac{Σ_{1\mathrm{kpc,H}α}}{Σ_{1\mathrm{kpc,C}}}=h(z)^{1.3}$. These functions suggest that the inside-out growth of the disk dominates the inside-out growth of the bulge towards lower redshifts. This is supported by the redshift evolution in EW(H$α$) profiles, where there is rapid increase in EW(H$α$) with radius within the half-light radius at $z=5.3$ but only significantly increasing EW(H$α$) with radius in the outer disk at $z=0.5$. |
| title | A First Look at Spatially Resolved Star Formation at $4.8<z<6.5$ with JWST FRESCO NIRCam Slitless Spectroscopy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.17629 |