Physical characteristics of bright Class I methanol masers

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Table 2

Summary of typical Class I maser luminosities, L_iso, brightness temperatures, T_b, and spot sizes.

Line	L_iso	T_b	Spot sizes	Source
	photons s^-1	K	AU

9.9 GHz	10⁴³ ^a	10⁴ ^a
25 GHz series	10⁴¹−10⁴³ ^a^b^c^d	2 × 10⁶−3 × 10⁷ ^b	22–56 ^b	Orion-KL ^b
36 GHz	10⁴³−10⁴⁴ ^e
44 GHz	10⁴²−10⁴⁵ ^f^g	4 × 10⁷−10¹⁰ ^g^h	6–50 ^g,h	IRAS 18151–1208 ^g
84 GHz	3 × 10⁴²−2 × 10⁴³ ^a	6 × 10³−5 × 10⁵ ^a
95 GHz	5 × 10⁴²−10⁴⁵ ^aⁱ^j^k	2 × 10⁴−10⁵ ^a
104 GHz	2 × 10⁴³ ^a	2 × 10⁴ ^a

Notes.Maser luminosities are taken from interferometric studies. Spot sizes are from the VLA observations of Johnston et al. (1997) at 25 GHz, and from the VLBI detection of Matsumoto et al. (2014) and are to be considered as upper and lower limits, respectively. The measurements reported by Voronkov et al. (2006) are based on linear resolutions of 4000–6000 AU.

Reference.

^(a)

Voronkov et al. (2006).

^(b)

Johnston et al. (1997) for the 6₂−6₁ line.

^(c)

Menten et al. (1986).

^(d)

Johnston et al. (1992).

^(e)

Fish et al. (2011).

^(f)

Kurtz et al. (2004).

^(g)

Matsumoto et al. (2014).

^(h)

Slysh & Kalenskii (2009).

⁽ⁱ⁾

Moscadelli et al. (2007).

^(j)

Plambeck & Menten (1990).

^(k)

Chen et al. (2011).

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