Excitation and spatial study of a prestellar cluster towards G+0.693-0.027 in the Galactic centre

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Volume 690 (October 2024)

A&A, 690 (2024) A121

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Table 2

Results from the multicomponent HC₃N LTE fitting procedure and from the rotational diagram (rd).

Component	FWHM (km s^–1)	v_LSR (km s^–1)	T_ex (K)	N (×10¹⁴ cm^–2)	$\begin{array}{l} T_{ex}^{(rd)} \\ (K) \end{array}$ $\matrix{ {T_{{\rm{ex}}}^{({\rm{rd}})}} \hfill \cr {({\rm{K}})} \hfill \cr }$	N^(rd) (×10¹⁴ cm^–2)	θ_source^(a) (″/pc)
Low- J transitions (E_up < 100 K)

C1 – broad	23.62 ± 0.17	67.79 ± 0.09	16.53 ± 0.15	6.54 ± 0.07^(b)	16.9 ± 0.2	7.8 ± 0.3	>27/>1^(c)
C2 – narrow	7.2 ± 0.6	73.5 ^(c)	14.5 ± 1.7	9 ± 3^(b)	15.9 ± 0.4	2.5 ± 0.2	9/0.36 ^(c)
C3 – narrow	8.8 ^(c)	77^(c)	64 ^(c)	0.29 ± 0.18	86 ± 12	0.12 ± 0.02	7.6/0.3 ^(c)

High- J transitions (E_up > 100 K)

C1 – broad	22.8 ± 0.4	67.2 ± 0.3	31.5 ± 0.8	0.93 ± 0.08	29 ± 2	1.2 ± 0.4	>27/>1^(c)
C2 – narrow	7.2 ^(c)	73.5 ^(c)	14.5 ^(c)	7.1 ± 1.7	14.1 ± 0.7	5.6 ± 2.5	9/0.36 ^(c)
C3 – narrow	8.8 ± 0.5	77 ^(c)	64 ± 10	0.36 ± 0.07^(b)	63 ± 21	0.29 ± 0.19	7.6/0.3 ^(c)

Notes.^(rd) Results from the rotational diagram. ^(a)The source size corresponds to the diameter. ^(b)Used as input for the non-LTE analysis explained in Sect. 3.3. ^(c)Parameters without errors are fixed in the fitting procedure, as explained in Sect. 3.1.

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