Big Three Dragons: A [N II] 122 mu m Constraint and New Dust-continuum Detection of a z=7.15 Bright Lyman-break Galaxy with ALMA
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Big Three Dragons : A [N II] 122 mu m Constraint and New Dust-continuum Detection of a z=7.15 Bright Lyman-break Galaxy with ALMA. / Sugahara, Yuma; Inoue, Akio K.; Hashimoto, Takuya; Yamanaka, Satoshi; Fujimoto, Seiji; Tamura, Yoichi; Matsuo, Hiroshi; Binggeli, Christian; Zackrisson, Erik.
In: Astrophysical Journal, Vol. 923, No. 1, 5, 07.12.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Big Three Dragons
T2 - A [N II] 122 mu m Constraint and New Dust-continuum Detection of a z=7.15 Bright Lyman-break Galaxy with ALMA
AU - Sugahara, Yuma
AU - Inoue, Akio K.
AU - Hashimoto, Takuya
AU - Yamanaka, Satoshi
AU - Fujimoto, Seiji
AU - Tamura, Yoichi
AU - Matsuo, Hiroshi
AU - Binggeli, Christian
AU - Zackrisson, Erik
PY - 2021/12/7
Y1 - 2021/12/7
N2 - We present new Atacama Large Millimeter/submillimeter Array Band 7 observational results of a Lyman-break galaxy at z = 7.15, B14-65666 ("Big Three Dragons"), which is an object detected in [O III] 88 mu m, [CII] 158 mu m, and dust continuum emission during the epoch of reionization. Our targets are the [N II] 122 mu m fine-structure emission line and the underlying 120 mu m dust continuum. The dust continuum is detected with a similar to 19 sigma significance. From far-infrared spectral energy distribution sampled at 90, 120, and 160 mu m, we obtain a best-fit dust temperature of 40 K (79 K) and an infrared luminosity of log(10)(L-IR/L-circle dot)=11.6 0.4 Z(circle dot)), the ionization parameter and hydrogen density are log(10)U similar or equal to-2.7 +/- 0.1 n(H) similar or equal to 50-250 cm(-3), respectively, which are comparable to those measured in low-redshift galaxies. The nitrogen-to-oxygen abundance ratio, N/O, is constrained to be subsolar. At Z < 0.4 Z(circle dot), the allowed U drastically increases as the assumed metallicity decreases. For high ionization parameters, the N/O constraint becomes weak. Finally, our Cloudy models predict the location of B14-65666 on the BPT diagram, thereby allowing a comparison with low-redshift galaxies.
AB - We present new Atacama Large Millimeter/submillimeter Array Band 7 observational results of a Lyman-break galaxy at z = 7.15, B14-65666 ("Big Three Dragons"), which is an object detected in [O III] 88 mu m, [CII] 158 mu m, and dust continuum emission during the epoch of reionization. Our targets are the [N II] 122 mu m fine-structure emission line and the underlying 120 mu m dust continuum. The dust continuum is detected with a similar to 19 sigma significance. From far-infrared spectral energy distribution sampled at 90, 120, and 160 mu m, we obtain a best-fit dust temperature of 40 K (79 K) and an infrared luminosity of log(10)(L-IR/L-circle dot)=11.6 0.4 Z(circle dot)), the ionization parameter and hydrogen density are log(10)U similar or equal to-2.7 +/- 0.1 n(H) similar or equal to 50-250 cm(-3), respectively, which are comparable to those measured in low-redshift galaxies. The nitrogen-to-oxygen abundance ratio, N/O, is constrained to be subsolar. At Z < 0.4 Z(circle dot), the allowed U drastically increases as the assumed metallicity decreases. For high ionization parameters, the N/O constraint becomes weak. Finally, our Cloudy models predict the location of B14-65666 on the BPT diagram, thereby allowing a comparison with low-redshift galaxies.
KW - MASS-METALLICITY RELATION
KW - STAR-FORMING GALAXIES
KW - LARGE-MAGELLANIC-CLOUD
KW - FAR-INFRARED LINES
KW - EMISSION-LINE
KW - CHEMICAL-COMPOSITION
KW - LUMINOSITY FUNCTION
KW - INTERSTELLAR-MEDIUM
KW - PHYSICAL CONDITIONS
KW - O III
U2 - 10.3847/1538-4357/ac2a36
DO - 10.3847/1538-4357/ac2a36
M3 - Journal article
VL - 923
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 5
ER -
ID: 286852511