The TMRT K band observations towards 26 infrared dark clouds: NH3, CCS, and HC3N

Xie, Jinjin; Fuller, G. A.; Li, Di; Ren, Zhiyuan; Wu, Jingwen; Duan, Yan; Wang, Junzhi; Li, Juan; Peretto, N.; Li, Shipeng; Shen, Zhi-Qiang

doi:10.1007/s11433-021-1695-0

Cited by 19 publications

(13 citation statements)

References 64 publications

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“…The Qband receiver provides the highest-frequency coverage of TMRT. Before this survey, the Q-band receiver of TMRT was not fully used for single-dish scientific observations, compared to the receivers of the C/Ku/K bands (Li et al 2016;Zhang et al 2017;Wu et al 2019aWu et al , 2019bXie et al 2021;Liu et al 2022).…”

Section: Tmrtmentioning

confidence: 99%

A Q-band Line Survey toward Orion KL Using the Tianma Radio Telescope

Liu

Shen

Qin

et al. 2022

ApJS

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We have conducted a line survey toward Orion KL using the Q-band receiver of the Tianma 65 m radio telescope (TMRT), covering 34.8–50 GHz with a velocity resolution between 0.79 and 0.55 km s−1, respectively. The observations reach a sensitivity of the level of 1–8 mK, proving that the TMRT is sensitive for conducting deep-line surveys. In total, 597 Gaussian features are extracted. Among them, 177 radio recombination lines (RRLs) are identified, including 126, 40, and 11 RRLs of hydrogen, helium, and carbon, with a maximum Δn of 16, 7, and 3, respectively. The carbon RRLs are confirmed to originate from photodissociation regions with a V LSR ∼ 9 km s−1. In addition, 371 molecular transitions of 53 molecular species are identified. Twenty-one molecular species of this survey were not firmly detected in the Q band by Rizzo et al., including species such as H2CS, HCOOH, C2H5OH, H 2 13 CO, H2CCO, CH3CHO, CH2OCH2, HCN υ 2 = 1, and CH3OCHO υ t = 1. In particular, the vibrationally excited states of ethyl cyanide (C2H5CN υ13/υ21) are for the first time firmly detected in the Q band. NH3 (15,15) and (16,16) are identified, and they are so far the highest transitions of the NH3 inversion lines detected toward Orion KL. All of the identified lines can be reproduced by a radiative transfer model.

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Section: Tmrtmentioning

confidence: 99%

A Q-band Line Survey toward Orion KL Using the Tianma Radio Telescope

Liu

Shen

Qin

et al. 2022

ApJS

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“…MNRAS 511, 3463-3476 (2022Ospina-Zamudio et al 2018 ;Hern ández-Hern ández et al 2019 ;Coletta et al 2020 ;Li et al 2020 ;M öller et al 2021 ;Xie et al 2021 ). Due to small source sizes of hot cores, single-dish observ ations suf fer from beam dilution and sample the emission from both hot cores and surrounding cold envelopes.…”

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confidence: 99%

ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – VIII. A search for hot cores by using C2H5CN, CH3OCHO, and CH3OH lines

Qin

Tie

Liu

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Hot cores characterized by rich lines of complex organic molecules are considered as ideal sites for investigating the physical and chemical environments of massive star formation. We present a search for hot cores by using typical nitrogen- and oxygen-bearing complex organic molecules (C2H5CN, CH3OCHO and CH3OH), based on ALMA Three-millimeter Observations of Massive Star-forming regions (ATOMS). The angular resolutions and line sensitivities of the ALMA observations are better than 2 arcsec and 10 mJy/beam, respectively. A total of 60 hot cores are identified with 45 being newly detected, in which the complex organic molecules have high gas temperatures (> 100 K) and small source sizes (< 0.1 pc). So far this is the largest sample of hot cores observed with similar angular resolution and spectral coverage. The observations have also shown nitrogen and oxygen differentiation in both line emission and gas distribution in 29 hot cores. Column densities of CH3OH and CH3OCHO increase as rotation temperatures rise. The column density of CH3OCHO correlates tightly with that of CH3OH. The pathways for production of different species are discussed. Based on the spatial position difference between hot cores and UC H ii regions, we conclude that 24 hot cores are externally heated while the other hot cores are internally heated. The observations presented here will potentially help establish a hot core template for studying massive star formation and astrochemistry.

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“…Second, the TMRT conducts many astronomical observations for scientific research purposes. Its operating frequency range covers many important astronomical spectrum lines, such as NH3, CCS, and HC3N (Xie J et al, 2021;Zhang et al, 2021). Pulsars are also important targets of the TMRT, such as the comprehensive pulse profile study of 71 pulsars (Zhao R.-S et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The Tian Ma 65-m Telescope Automatic Early Warning System

Shang-Guan

Rong-Bing

Zhang

et al. 2022

Front. Astron. Space Sci.

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The Tian Ma Radio Telescope (TMRT), which is mainly used for deep space exploration and radio astronomy observations, is the largest fully steerable radio telescope in Asia. For promoting the automation of the telescope, an automatic early warning system is designed and implemented. The system can conveniently aggregate heterogeneous sensor data, make use of established strategies to implement an alert system, and send real-time alarms through multiple channels, which is helpful to promote unmanned operation. In addition, we adopt DevOps (a compound of development (Dev) and operations (Ops) which means end-to-end automation in software development and delivery) to simplify the development, upgrading, and maintenance of the telescope automatic early warning system.

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The TMRT K band observations towards 26 infrared dark clouds: NH3, CCS, and HC3N

Cited by 19 publications

References 64 publications

A Q-band Line Survey toward Orion KL Using the Tianma Radio Telescope

A Q-band Line Survey toward Orion KL Using the Tianma Radio Telescope

ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – VIII. A search for hot cores by using C2H5CN, CH3OCHO, and CH3OH lines

The Tian Ma 65-m Telescope Automatic Early Warning System

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