Ningyu Tang

The evolution of C_4H and c-C_3H_2 in molecular cores

Yijia Liu, Jun Zhi Wang, Ningyu Tang, Yang Lu et autres

Linear C_4H and cyclic c-C_3H_2, as small unsaturated hydrocarbons, are the key precursors to complex organic molecules and are critical components of the interstellar medium. However, observational constraints on the evolution of these molecules in late-stage massive star-forming regions remain scarce. We …

The evolution of C 4 H and c -C 3 H 2 in molecular cores

Yijia Liu, Jun Zhi Wang, Ningyu Tang, Yang Lu et autres

Context . Linear C 4 H and cyclic c -C 3 H 2 , as small unsaturated hydrocarbons, are the key precursors to complex organic molecules and are critical components of the interstellar medium. However, observational constraints on the evolution of these …

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Insights into the Physical Nature of Polar-ring Galaxies from H I Observations

Nan Yu, Han Zheng, Chao‐Wei Tsai, Pei Zuo et autres

Abstract Polar-ring galaxies (PRGs) host an outer ring of gas and stars oriented nearly perpendicular to the main stellar body. They represent extreme examples of misaligned systems and provide valuable insights into galaxy interactions, gas accretion, and peculiar gas dynamics. We compile …

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Large scale mapping of [CI] and the [CI]-to-CO transition in $ρ$ Ophiuchus molecular cloud

Jifeng Xia, Ningyu Tang, Thomas G. Bisbas, Chen Wang et autres

Atomic carbon ([CI]) is a key species in the carbon chemistry of the interstellar medium (ISM). Using the Submillimeter Wave Astronomy Satellite (SWAS), we conducted a [CI]($^3$P$_1$--$^3$P$_0$) 492 GHz survey covering approximately 4 deg$^2$ of the L1688 and L1689 regions in the …

Large scale mapping of [CI] and the [CI]-to-CO transition in $ρ$ Ophiuchus molecular cloud

Jifeng Xia, Ningyu Tang, Thomas G. Bisbas, Chen Wang et autres

Atomic carbon ([CI]) is a key species in the carbon chemistry of the interstellar medium (ISM). Using the Submillimeter Wave Astronomy Satellite (SWAS), we conducted a [CI]($^3$P$_1$--$^3$P$_0$) 492 GHz survey covering approximately 4 deg$^2$ of the L1688 and L1689 regions in the …

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A stringent constraint on the fractional change of proton g-factor

Renzhi Su, Stephen John Curran, Jeremy Darling, Minfeng Gu et autres

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Insights into the Physical Nature of Polar Ring Galaxies from H I Observations

Niankun Yu, Han Zheng, Chao-Wei Tsai, Pei Zuo et autres

Polar ring galaxies (PRGs) host an outer ring of gas and stars oriented nearly perpendicular to the main stellar body. They represent extreme examples of misaligned systems and provide valuable insight into galaxy interactions, gas accretion, and peculiar gas dynamics. We compile …

Insights into the Physical Nature of Polar Ring Galaxies from H I Observations

Niankun Yu, Han Zheng, Chao-Wei Tsai, Pei Zuo et autres

Polar ring galaxies (PRGs) host an outer ring of gas and stars oriented nearly perpendicular to the main stellar body. They represent extreme examples of misaligned systems and provide valuable insight into galaxy interactions, gas accretion, and peculiar gas dynamics. We compile …

The evolution of CH in Planck Galactic cold clumps

Gan Luo, A. M. Jacob, M. Padovani, Daniele Galli et autres

Methylidyne (CH) has long been considered a reliable tracer of molecular gas in the low-to-intermediate extinction range. Although extended CH 3.3 GHz emission is commonly observed in diffuse and translucent clouds, observations in cold, dense clumps are rare. In this work, we …

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A new measurement of the Galactic 12C/13C gradient from sensitive HCO+ absorption observations

Gan Luo, Laura Colzi, Tie Liu, Thomas G. Bisbas et autres

We present a new constraint on the Galactic 12C/13C gradient with sensitive HCO+ absorption observations against strong continuum sources. The new measurements suffer less from beam dilution, optical depths, and chemical fractionation, allowing us to derive the isotopic ratios precisely. The measured …

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Abundance ratios of OH/CO and HCO+/CO as probes of the cosmic ray ionization rate in diffuse clouds

Gan Luo, Zhiyu Zhang, Thomas G. Bisbas, Di Li et autres

The cosmic-ray ionization rate (CRIR, $ζ_2$) 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$_2$O$^+$, are hard to detect and …

Dependence of Chemical Abundance on the Cosmic Ray Ionization Rate in IC 348

Gan Luo, Zhi-Yu Zhang, Thomas G. Bisbas, Di Li et autres

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 stars are absent. In this work, we combine molecular line …