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Big Three Dragons: A [N II] 122 $μ$m Constraint and New Dust-continuum Detection of A $z = 7.15$ Bright Lyman Break Galaxy with ALMA | | Yuma Sugahara
; Akio K. Inoue
; Takuya Hashimoto
; Satoshi Yamanaka
; Seiji Fujimoto
; Yoichi Tamura
; Hiroshi Matsuo
; Christian Binggeli
; Erik Zackrisson
; | | Date: |
6 Apr 2021 | | Abstract: | 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 [OIII] 88 $
m{mu m}$, [CII]
158 $
m{mu m}$, and dust-continuum emission during the epoch of reionization.
Our targets are the [NII] 122 $
m{mu m}$ fine-structure emission line and
underlying 120 $
m{mu m}$ dust continuum. The dust continuum is detected with
a $ sim $19$ sigma $ significance. From far-infrared spectral energy
distribution sampled at 90, 120, and 160 $
m{mu m}$, we obtaine a best-fit
dust temperature of $ 40 $ K ($ 79 $ K) and an infrared luminosity of $
log_{10}(L_{
m IR}/{
m L}_odot)=11.6$ ($12.1$) at the emissivity index $
eta = 2.0 $ (1.0). The [NII] 122 $
m{mu m}$ line is not detected. The 3$
sigma $ upper limit of the [NII] luminosity is $ 8.1 imes 10^7 {
m
L}_odot$. From the [NII], [OIII], and [CII] line luminosities, we use the
Cloudy photoionization code to estimate nebular parameters as functions of
metallicity. If the metallicity of the galaxy is high ($ Z > 0.4 {
m
Z}_odot$), the ionization parameter and hydrogen density are $ log_{10} U
simeq -2.7pm0.1$ and $ n_ ext{H} simeq 50$-$250 {
m cm}^{-3}$,
respectively, which are comparable to those measured in low-redshift galaxies.
The nitrogen-to-oxygen abundance ratio, $
m{N/O}$, is constrained to be
sub-solar. At $ Z < 0.4 {
m Z}_odot$, the allowed $ U $ drastically
increases as the assumed metallicity decreases. For high ionization parameters,
the $
m{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. | | Source: | arXiv, 2104.02201 | | Services: | Forum | Review | PDF | Favorites | |
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