TRAO Status Report2020 Radio Telescope User's Meeting

Telescope and Instruments• Antenna

- 14 m primary reflector

• Frontend: SEQUOIA-TRAO

- 4x4 pixel array

- Tuning range: 85 - 115.6 GHz

- Beam FWHM: 60 - 45 arcsec

• Observing modes

- On-the-Fly mapping

- Position-switching scan

• Backend: FFT spectrometer

- Two narrow-band windows on all 16 pixels

‣ LO1 and LO2

- on the same side of 100.4 GHz

‣ Each LO window with 4096 channels in a 62.5 MHz bandwidth

‣ Channel width: 15.26 kHz ~ 0.05 km/s

- One wide-band window on 2 pixels

‣ Independently controllable LO3 window with 32768 channels in a 2 GHz bandwidth

‣ Channel width: 61 kHz ~ 0.2 km/s

‣ Position-switching mode only (for now)

Operations• Modes of telescope control

- Onsite observing mode

‣ Recommended, whenever possible

- Remote observing mode

‣ Not recommended for inexperienced users

‣ In case of trouble during off-hours, prompt support may not be available.

• 2019-2020 season

- Observing programs

‣ 7 general programs

‣ 3 large programs

‣ 2 key-science programs (extended)

- Total observing time used: 2823 hours

- Instrument operations have been stable.

• 2020-2021 season

- Proposal submission deadline: Aug 20

- Proposal categories

‣ General program (< 100 hr, single season)

‣ Large program (< 300 hr, single season)

‣ Key-science program (< 400 hr/yr, multi-year)

- Backends

‣ 16x2 narrow-band (LO1+LO2) backend

‣ 2x1 wide-band (LO3) backend

- Science verification needed

TRAO-based Papers (2019)• Publication rate: ~5 papers/year

• Multi-scale analysis of the Monoceros OB 1 star-forming region. II. Colliding filaments in the Monoceros OB1 molecular cloud (Montillaud et al. 2019, A&A)

• High-resolution Observations of the Molecular Clouds Associated with the Huge H II Region CTB 102 (Marshall et al. 2019, ApJ)

• TRAO Survey of Nearby Filamentary Molecular Clouds, the Universal Nursery of Stars (TRAO FUNS). I. Dynamics and Chemistry of L1478 in the California Molecular Cloud (Chung et al. 2019, ApJ)

• Initial phases of high-mass star formation: a multiwavelength study towards the extended green object G12.42+0.50 (Issac et al. 2019, MNRAS)

• Performance of the TRAO 13.7-m Telescope with New Systems (Jeong et al. 2019, JKAS)

TRAO-based Papers (2020)• 4 papers published, as of August 12

• Large-scale Molecular Gas Distribution in the M17 Cloud Complex: Dense Gas Conditions of Massive Star Formation? (Nguyen-Luong et al. 2020, ApJ)

• Star Formation Occurs in Dense Gas, but What Does "Dense" Mean? (Evans et al. 2020, ApJ)

• Edge collapse and subsequent longitudinal accretion in filament S242 (Yuan et al. 2020, A&A)

• Distance, magnetic field, and kinematics of the filamentary cloud LDN 1157 (Sharma et al. 2020, A&A)

Thank You