Zobrazeno 1 - 10
of 205
pro vyhledávání: '"Tang, Ningyu"'
Publikováno v:
A&A 690, A372 (2024)
We present a new constraint on the Galactic $^{12}$C/$^{13}$C gradient with sensitive HCO$^+$ absorption observations against strong continuum sources. The new measurements suffer less from beam dilution, optical depths, and chemical fractionation, a
Externí odkaz:
http://arxiv.org/abs/2409.11821
Autor:
Liu, Yijia, Wang, Junzhi, Liu, Shu, Tang, Ningyu, Gong, Yan, Li, Yuqiang, LI, Juan, Luo, Rui, Xu, Yani
C$_4$H and $c$-C$_3$H$_2$, as unsaturated hydrocarbon molecules, are important for forming large organic molecules in the interstellar medium. We present mapping observations of C$_4$H ($N$=9$-8$) lines, $c$-C$_3$H$_2$ ($J_{Ka,Kb}$=2$_{1,2}$-1$_{0,1}
Externí odkaz:
http://arxiv.org/abs/2406.19740
Autor:
Liu, Ziming, Wang, Jie, Jing, Yingjie, Zhang, Zhi-Yu, Xu, Chen, Liang, Tiantian, Chen, Qingze, Tang, Ningyu, Yang, Qingliang
Accurate flux density calibration is essential for precise analysis and interpretation of observations across different observation modes and instruments. In this research, we firstly introduce the flux calibration model incorporated in HIFAST pipeli
Externí odkaz:
http://arxiv.org/abs/2406.08278
Autor:
Luo, Gan, Li, Di, Zhang, Zhi-yu, Bisbas, Thomas G., Tang, Ningyu, Lin, Lingrui, Sun, Yichen, Zuo, Pei, Zhou, Jing
Publikováno v:
A&A 685, L12 (2024)
The CO-dark molecular gas (DMG), which refers to the molecular gas not traced by CO emission, is crucial for the evolution of the interstellar medium (ISM). While the gas properties of DMG have been widely explored in the Solar neighborhood, whether
Externí odkaz:
http://arxiv.org/abs/2405.02055
Autor:
Jing, Yingjie, Wang, Jie, Xu, Chen, Liu, Ziming, Chen, Qingze, Liang, Tiantian, Xu, Jinlong, Cao, Yixian, Wang, Jing, Hu, Huijie, Zhang, Chuan-Peng, Guo, Qi, Gao, Liang, Ai, Mei, Gan, Hengqian, Gao, Xuyang, Han, Jinlin, Hou, Ligang, Hou, Zhipeng, Jiang, Peng, Kong, Xu, Li, Fujia, Liu, Zerui, Shao, Li, Pan, Hengxing, Pan, Jun, Qian, Lei, Sun, Jinghai, Tang, Ningyu, Yang, Qingliang, Zhang, Bo, Zhang, Zhiyu, Zhu, Ming
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has the largest aperture and a 19-beam L-band receiver, making it powerful for investigating the neutral hydrogen atomic gas (HI) in the universe. We present HiFAST (https://hifast.read
Externí odkaz:
http://arxiv.org/abs/2401.17364
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 525, Issue 3, November 2023, Pages 4761-4800
Optical depths of dense molecular gas are commonly used in Galactic and extragalactic studies to constrain the dense gas mass of the clouds or galaxies. The optical depths are often obtained based on spatially unresolved data, especially in galaxies,
Externí odkaz:
http://arxiv.org/abs/2309.09544
Autor:
Su, Renzhi, Gu, Minfeng, Curran, S. J., Mahony, Elizabeth K., Tang, Ningyu, Allison, James R., Li, Di, Zhu, Ming, Aditya, J. N. H. S., Yoon, Hyein, Zheng, Zheng, Wu, Zhongzu
In this letter, we report the discovery of a fast neutral hydrogen outflow in SDSS J145239.38+062738.0, a merging radio galaxy containing an optical type I active galactic nuclei (AGN). This discovery was made through observations conducted by the Fi
Externí odkaz:
http://arxiv.org/abs/2309.01890
Autor:
Luo, Gan, Zhang, Zhiyu, Bisbas, Thomas G., Li, Di, Zhou, Ping, Tang, Ningyu, Wang, Junzhi, Zuo, Pei, Yue, Nannan
The cosmic-ray ionization rate (CRIR, $\zeta_2$) is one of the key parameters controlling the formation and destruction of various molecules in molecular clouds. However, the current most commonly used CRIR tracers, such as H$_3^+$, OH$^+$, and H$_2$
Externí odkaz:
http://arxiv.org/abs/2302.12970
Autor:
Luo, Gan, Zhang, Zhi-Yu, Bisbas, Thomas G., Li, Di, Tang, Ningyu, Wang, Junzhi, Zhou, Ping, Zuo, Pei, Yue, Nannan, Zhou, Jing, Lin, Lingrui
Ions (e.g., H$_3^+$, H$_2$O$^+$) have been used extensively to quantify the cosmic-ray ionization rate (CRIR) in diffuse sightlines. However, measurements of CRIR in low-to-intermediate density gas environments are rare, especially when background st
Externí odkaz:
http://arxiv.org/abs/2211.13380
Autor:
Xia, Jifeng, Tang, Ningyu, Zhi, Qijun, Jiao, Sihan, Xie, Jinjin, Fuller, Gary A., Goldsmith, Paul F., Li, Di
The distribution of ultraviolet (UV) radiation field provides critical constraints on the physical environments of molecular clouds. Within 1 kpc of our solar system and fostering protostars of different masses, the giant molecular clouds in the Goul
Externí odkaz:
http://arxiv.org/abs/2208.05250