ALMA Reveals Extended Cool Gas and Hot Ionized Outflows in a Typical Star-forming Galaxy at Z=7.13
| Autor: | Hollis B. Akins, Seiji Fujimoto, Kristian Finlator, Darach Watson, Kirsten K. Knudsen, Johan Richard, Tom J. L. C. Bakx, Takuya Hashimoto, Akio K. Inoue, Hiroshi Matsuo, Michał J. Michałowski, Yoichi Tamura |
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| Přispěvatelé: | Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Galaxy formation
Circumgalactic medium [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] INTERSTELLAR-MEDIUM PROBING COSMIC DAWN REDSHIFT FOS: Physical sciences LINE Astronomy and Astrophysics HIGH-Z EXPLORATION DUST CONTENT MASS Astrophysics - Astrophysics of Galaxies C II EMISSION QUASARS Space and Planetary Science Interstellar medium [SDU]Sciences of the Universe [physics] Astrophysics of Galaxies (astro-ph.GA) Galaxy evolution High-redshift galaxies GALACTIC WINDS |
| Zdroj: | Akins, H B, Fujimoto, S, Finlator, K, Watson, D, Knudsen, K K, Richard, J, Bakx, T J L C, Hashimoto, T, Inoue, A K, Matsuo, H, Michalowski, M J & Tamura, Y 2022, ' ALMA Reveals Extended Cool Gas and Hot Ionized Outflows in a Typical Star-forming Galaxy at Z=7.13 ', Astrophysical Journal, vol. 934, no. 1, 64 . https://doi.org/10.3847/1538-4357/ac795b The Astrophysical Journal The Astrophysical Journal, 2022, 934, ⟨10.3847/1538-4357/ac795b⟩ |
| ISSN: | 0004-637X 1538-4357 |
| Popis: | We present spatially-resolved morphological properties of [CII] 158 $\mu$m, [OIII] 88 $\mu$m, dust, and rest-frame ultraviolet (UV) continuum emission for A1689-zD1, a strongly lensed, sub-L* galaxy at $z=7.13$, by utilizing deep Atacama Large Millimeter/submillimeter Array (ALMA) and Hubble Space Telescope (HST) observations. While the [OIII] line and UV continuum are compact, the [CII] line is extended up to a radius of $r \sim 12$ kpc. Using multi-band rest-frame far-infrared (FIR) continuum data ranging from 52-400 $\mu$m, we find an average dust temperature and emissivity index of $T_{\rm dust} = 41^{+17}_{-14}$ K and $\beta = 1.7^{+1.1}_{-0.7}$, respectively, across the galaxy. We find slight differences in the dust continuum profiles at different wavelengths, which may indicate that the dust temperature decreases with distance. We map the star-formation rate (SFR) via IR and UV luminosities and determine a total SFR of $37\pm 1~M_\odot~{\rm yr}^{-1}$ with an obscured fraction of $87\%$. While the [OIII] line is a good tracer of the SFR, the [CII] line shows deviation from the local $L_{\rm [CII]}$-SFR relations in the outskirts of the galaxy. Finally, we observe a clear difference in the line profile between [CII] and [OIII], with significant residuals ($\sim 5\sigma$) in the [OIII] line spectrum after subtracting a single Gaussian model. This suggests a possible origin of the extended [CII] structure from the cooling of hot ionized outflows. The extended [CII] and high-velocity [OIII] emission may both contribute in part to the high $L_{\rm [OIII]}$/$L_{\rm [CII]}$ ratios recently reported in $z>6$ galaxies. Comment: 22 pages, 14 figures, accepted to ApJ, presented at AAS240 |
| Databáze: | OpenAIRE |
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