Median Surface Brightness Profiles of Lyman-$α$ Haloes in the MUSE Extremely Deep Field
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Guo, Yucheng Bacon, Roland Wisotzki, Lutz Garel, Thibault Blaizot, Jérémy Schaye, Joop Richard, Johan Alonso, Yohana Herrero Leclercq, Floriane Boogaard, Leindert Kusakabe, Haruka Pharo, John Vitte, Eloïse |
| author_facet | Guo, Yucheng Bacon, Roland Wisotzki, Lutz Garel, Thibault Blaizot, Jérémy Schaye, Joop Richard, Johan Alonso, Yohana Herrero Leclercq, Floriane Boogaard, Leindert Kusakabe, Haruka Pharo, John Vitte, Eloïse |
| contents | We present the median surface brightness profiles of diffuse Ly$α$ haloes (LAHs) around star-forming galaxies by stacking 155 spectroscopically confirmed Ly$α$ emitters (LAEs) at 3<z<4 in the MUSE Extremely Deep Field (MXDF), with median Ly$α$ luminosity $\mathrm{L_{Lyα} \approx 10^{41.1} erg\,s^{-1}}$. After correcting for a systematic surface brightness offset we identified in the datacube, we detect extended Ly$α$ emission out to a distance of 270 kpc. The median Ly$α$ surface brightness profile shows a power-law decrease in the inner 20 kpc, and a possible flattening trend at larger distance. This shape is similar for LAEs with different Ly$α$ luminosities, but the normalisation of the surface brightness profile increases with luminosity. At distances over 50 kpc, we observe strong overlap of adjacent LAHs, and the Ly$α$ surface brightness is dominated by the LAHs of nearby LAEs. We find no clear evidence of redshift evolution of the observed Ly$α$ profiles when comparing with samples at 4<z<5 and 5<z<6. Our results are consistent with a scenario in which the inner 20 kpc of the LAH is powered by star formation in the central galaxy, while the LAH beyond a radius of 50 kpc is dominated by photons from surrounding galaxies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_05513 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Median Surface Brightness Profiles of Lyman-$α$ Haloes in the MUSE Extremely Deep Field Guo, Yucheng Bacon, Roland Wisotzki, Lutz Garel, Thibault Blaizot, Jérémy Schaye, Joop Richard, Johan Alonso, Yohana Herrero Leclercq, Floriane Boogaard, Leindert Kusakabe, Haruka Pharo, John Vitte, Eloïse Astrophysics of Galaxies We present the median surface brightness profiles of diffuse Ly$α$ haloes (LAHs) around star-forming galaxies by stacking 155 spectroscopically confirmed Ly$α$ emitters (LAEs) at 3<z<4 in the MUSE Extremely Deep Field (MXDF), with median Ly$α$ luminosity $\mathrm{L_{Lyα} \approx 10^{41.1} erg\,s^{-1}}$. After correcting for a systematic surface brightness offset we identified in the datacube, we detect extended Ly$α$ emission out to a distance of 270 kpc. The median Ly$α$ surface brightness profile shows a power-law decrease in the inner 20 kpc, and a possible flattening trend at larger distance. This shape is similar for LAEs with different Ly$α$ luminosities, but the normalisation of the surface brightness profile increases with luminosity. At distances over 50 kpc, we observe strong overlap of adjacent LAHs, and the Ly$α$ surface brightness is dominated by the LAHs of nearby LAEs. We find no clear evidence of redshift evolution of the observed Ly$α$ profiles when comparing with samples at 4<z<5 and 5<z<6. Our results are consistent with a scenario in which the inner 20 kpc of the LAH is powered by star formation in the central galaxy, while the LAH beyond a radius of 50 kpc is dominated by photons from surrounding galaxies. |
| title | Median Surface Brightness Profiles of Lyman-$α$ Haloes in the MUSE Extremely Deep Field |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2309.05513 |