Ionized and cold gas components in low surface brightness galaxy AGC 102004
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2024
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| author | Cao, Tian-Wen Li, Zi-Jian Chen, Pei-Bin Zhang, Chun-Yi Galaz, Gaspar Cheng, Cheng Yu, Qingzheng Kalari, Venu M. Wang, Junfeng Wu, Hong |
| author_facet | Cao, Tian-Wen Li, Zi-Jian Chen, Pei-Bin Zhang, Chun-Yi Galaz, Gaspar Cheng, Cheng Yu, Qingzheng Kalari, Venu M. Wang, Junfeng Wu, Hong |
| contents | We present the integral field spectroscopic observations of ionized gas (H$α$ and [{\ion{N}{II}}]) using the PCWI, along with deep CO(2-1) observations by the $^\backprime\bar{\rm U}^\backprime\bar{\rm u}$ receiver on JCMT for AGC 102004. The velocity field of H$α$ shows an anomalous distribution in the North-Western (NW) disk. The H$α$ spectrum is well-fitted by two Gaussian components, and the weak Gaussian component is dominated by the anomalous H$α$ in the NW disk. The Gaussian fit center of H$α$ emission is offset by +24.2 km s$^{-1}$ from the systemic velocity obtained from the HI emission. We derive the gas-phase metallicity, 12+log(O/H), using [{\ion{N}{II}}]$λ$6583/H$α$ ratio as a proxy. The mean value of 12+log(O/H) is 8.30 $\pm$ 0.19 over the whole galaxy. The metallicity in the outer disk is lower than the detection limit of 7.72, indicating the metallicity gradient exists in AGC 102004. We speculate a minor/mini-merger event could have happened to the NW disk. CO(2-1) emission has non-detection in AGC 102004, reaching a noise level of 0.33 mK smoothed to 30 km s$^{-1}$. The upper limit of molecular gas mass in AGC 102004 is 2.1 $\times$ 10$^7$ M$\odot$ with X$_{\rm CO}$ = 3.02$\times$10$^{20}$ cm$^{-2}$ (K km s$^{-1}$)$^{-1}$. The M$_{\rm H_2}$/M$^{\rm corr}_{\rm HI}$ of AGC 102004 is lower than 0.0037 and lower than that of normal galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_18530 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ionized and cold gas components in low surface brightness galaxy AGC 102004 Cao, Tian-Wen Li, Zi-Jian Chen, Pei-Bin Zhang, Chun-Yi Galaz, Gaspar Cheng, Cheng Yu, Qingzheng Kalari, Venu M. Wang, Junfeng Wu, Hong Astrophysics of Galaxies We present the integral field spectroscopic observations of ionized gas (H$α$ and [{\ion{N}{II}}]) using the PCWI, along with deep CO(2-1) observations by the $^\backprime\bar{\rm U}^\backprime\bar{\rm u}$ receiver on JCMT for AGC 102004. The velocity field of H$α$ shows an anomalous distribution in the North-Western (NW) disk. The H$α$ spectrum is well-fitted by two Gaussian components, and the weak Gaussian component is dominated by the anomalous H$α$ in the NW disk. The Gaussian fit center of H$α$ emission is offset by +24.2 km s$^{-1}$ from the systemic velocity obtained from the HI emission. We derive the gas-phase metallicity, 12+log(O/H), using [{\ion{N}{II}}]$λ$6583/H$α$ ratio as a proxy. The mean value of 12+log(O/H) is 8.30 $\pm$ 0.19 over the whole galaxy. The metallicity in the outer disk is lower than the detection limit of 7.72, indicating the metallicity gradient exists in AGC 102004. We speculate a minor/mini-merger event could have happened to the NW disk. CO(2-1) emission has non-detection in AGC 102004, reaching a noise level of 0.33 mK smoothed to 30 km s$^{-1}$. The upper limit of molecular gas mass in AGC 102004 is 2.1 $\times$ 10$^7$ M$\odot$ with X$_{\rm CO}$ = 3.02$\times$10$^{20}$ cm$^{-2}$ (K km s$^{-1}$)$^{-1}$. The M$_{\rm H_2}$/M$^{\rm corr}_{\rm HI}$ of AGC 102004 is lower than 0.0037 and lower than that of normal galaxies. |
| title | Ionized and cold gas components in low surface brightness galaxy AGC 102004 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2407.18530 |