Characterizing the physical and chemical properties of the Class I protostellar system Oph-IRS 44 - Binarity, infalling streamers, and accretion shocks

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Volume 706 (February 2026)

A&A, 706 (2026) A256

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Table 4

Excitation temperature and molecular column densities.

Species	T_ex (K)	N (cm⁻²)	Comment
Estimated values sing RADEX

SO	50–220	(0.06–7.0) × (10¹⁷)	This work
SO₂	101–234	(0.4–1.8) × (10¹⁷)	From Artur de la Villarmois et al. (2022) ^(a)

Assumed temperatures (r = $0_{\cdot}^{''} 5$ $\[0^{\prime\prime}_\cdot5\]$ )

CO	50–200	(2.9–7.6) × (10¹⁸)	Using ¹³CO 3–2 and ¹²C/¹³C = 69 ^(b)
CS	50–200	(3.1–4.9) × (10¹³)	Using CS 7–6
H₂CO	50–200	(0.6–2.6) × (10¹³)	Using H₂CO 4_1,3–3_1,2
CH₃OH	100	≤5.0 × 10¹⁴	From Artur de la Villarmois et al. (2019) ^(c)
OCS ^(d)	50–200	≤1.4 × 10¹⁴	Using OCS 28–27
H₂S ^(d)	50–200	≤3.6 × 10¹³	Using H₂S 3_3,0–3_2,1
H₂CS ^(d)	50–200	≤3.2 × 10¹³	Using H₂CS 10_0,10–9_0,9

Notes. ^(a) Estimated from a circular region with r = $0_{\cdot}^{''} 2$ $\[0^{\prime\prime}_\cdot2\]$ . ^(b) From Wilson (1999). ^(c) Estimated from a $0_{\cdot}^{''} 4$ $\[0^{\prime\prime}_\cdot4\]$ × $0_{\cdot}^{''} 3$ $\[0^{\prime\prime}_\cdot3\]$ region. ^(d) Upper limits correspond to an integrated flux of 3σ.

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