Pre-perihelion radio observations of comet 12P/Pons-Brooks with the Tianma Radio Telescope

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Volume 701 (September 2025)

A&A, 701 (2025) A204

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Table 3

18 cm OH spectral characteristics of 12P.

UT date [yyyy/mm/dd]	Lines	RMS^a [Jy]	FWHM^b [km s⁻¹]	S^c [Jy km s ⁻¹]	Doppler shift ^d [km s⁻¹]	T_peak^e [Jy]
2024/01/20	OH 1665 MHz	0.059	−	0.200 ± 0.060	−	0.266
	OH 1667 MHz	0.070	−	0.408 ± 0.079	−	0.306
	Average	0.053	1.709 ± 0.204	0.392 ± 0.054	−0.114 ± 0.111	0.267
2024/03/02	OH 1665 MHz	0.057	−	0.456 ± 0.065	−	0.321
	OH 1667 MHz	0.067	−	0.740 ± 0.076	−	0.306
	Average	0.045	2.587 ± 0.229	0.768 ± 0.051	−0.044 ± 0.089	0.389
2024/03/03	OH 1665 MHz	0.067	−	0.253 ± 0.068	−	0.177
	OH 1667 MHz	0.056	−	0.487 ± 0.057	−	0.309
	Average	0.044	2.079 ± 0.201	0.479 ± 0.045	0.184 ± 0.104	0.257

Notes. ^a The 1 σ noise of the base residuals in observed spectra (S scale). ^b The FWHM line width obtained from a Gaussian fit. ^c The integrated flux density. ^d The velocity offset from a Gaussian fit. ^e The peak flux.

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