The millimeter-wave spectrum and astronomical search for ethyl methyl sulfide

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Volume 639 (July 2020)

A&A, 639 (2020) A129

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Table 4.

Physical parameters of the considered cloud cores in the astronomical search of EMS.

Source	Coordinates	HPBW ^(a)	Frequencies ^(b)	v_LSR^(c)	Δv_FWHM^(d)	d_sou^(e)	T_rot^(f)	N_trans^(g)	N_gauche^(h)
	J2000.0	(″)	(GHz)	(km s⁻¹)	(km s⁻¹)	(″)	(K)	×10¹⁶ (cm⁻²)	×10¹⁶ (cm⁻²)
Orion KL	α = 5^h35	30–14	80–178	5.0	7.0	10	200	≤(0.5 ± 0.2)	≤(1.0 ± 0.3)
(Hot core) ⁽ⁱ⁾

Orion KL	α = 5^h35	30–14	80–178	7.0	1.5	3	100	≤(1.0 ± 0.3)	≤(2.0 ± 0.6)
(Compact ridge)^(j)

Sgr B2(N)		30–21	80–115.5	63	8.0	5.0	60	≤(2.5 ± 0.7)	≤(5 ± 2)
				73	8.0	5.0	60	≤(1.0 ± 0.3)	≤(2.5 ± 0.7)

B1-b	α = 03^h33^m20.0^s	30–21	82.5–115.5	6.7	0.7	60	12	≤(0.0005 ± 0.0002)	≤(0.0010 ± 0.0003)


TMC-1		30–21	82.5–115.5	6.0	0.7	60	10	≤(0.0005 ± 0.0002)	≤(0.0010 ± 0.0003)

Notes.

^(a)

Half power beam width.

^(b)

Range of frequencies considered in the analysis.

^(c)

Radial velocity with respect to the Local Standard of Rest.

^(d)

Full width at half maximum.

^(e)

Source diameter assuming a uniform disc-type model.

^(f)

Rotational temperature.

^(g)

Column density for trans-CH₃CH₂SCH₃ in the ground state.

^(h)

Column density for gauche-CH₃CH₂SCH₃ in the ground state.

⁽ⁱ⁾

Assuming an offset of 3″ with respect to the pointing position.

^(j)

Assuming an offset of 7″ with respect to the pointing position.

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