An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253

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Volume 689 (September 2024)

A&A, 689 (2024) A64

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Table 4.

Range of physical conditions derived towards the CMZ of NGC 253 for each species and component.

Species	E_u [K]	T_gas [K]	n_gas [cm⁻³]

H₂S	28 − 169	30 − 159	≥2 × 10⁶

CS low-E_u	7 − 23.5	5 − 14	≥3 × 10³

CS high-E_u	35 − 66	15 − 110	≥1.5 × 10⁵

SO low-E_u	9 − 34	15 − 300	≥5 × 10³

SO high-E_u	35 − 86	27 − 260	≥3 × 10⁵

OCS low-E_u	16 − 111	12 − 100	≥2 × 10⁴

OCS high-E_u	161 − 254	124 − 312 ^(a)	...

H₂CS low-E_u	10 − 38	10 − 70	≥10³

H₂CS high-E_u	59 − 120	50 − 300	7 × 10⁴ − 10⁷

CCS low-E_u	20 − 37	3 − 14 ^(a)	...

CCS mid-E_u	37 − 65	19 − 32 ^(a)	...

CCS high-E_u	65 − 227	33 − 72 ^(a)	...

SO₂ low E_u	8 − 123	55 − 79 ^(a)	...

SO₂ high E_u	123 − 416	115 − 298 ^(a)	...

Notes. Each component is associated with a range of upper-level energies. The ranges for the temperature and density cover all the positions.

^(a)

The temperature is the rotation temperature T_rot.

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