Different evolutionary stages in massive star formation - Centimeter continuum and H2O maser emission with ATCA

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Volume 550 (February 2013)

A&A, 550 (2013) A21

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Table 6

Median values of main physical parameters of the centimeter sources.

Parameter	Units	All sources	Low^a	High^a	Type 1^b	Type 2^b	Type 3^b
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)

number of sources	–	214	75	74	15	99	55
flux_18.0 GHz	mJy	46	37	125	13	107	48
flux_22.8 GHz	mJy	37	33	102	10	120	43
spectral index	–	−0.4	−0.3	−0.3	−0.8	−0.2	−0.2
L _cm	mJy kpc²	7900	5700	37 100	1100	15 100	15 800
I_peak / S_flux	mJy beam^-1/mJy	0.65	0.62	0.71	0.52	0.70	0.59
angular size	arcsec	19	22	14	27	15	21
radius	pc	0.18	0.18	0.17	0.36	0.14	0.25
n _e	10³ cm^-3	0.58	0.46	1.12	0.13	1.23	0.46
EM	10⁶ cm^-6 pc	0.79	0.60	3.09	0.13	2.82	0.71
M _i	M _⊙	0.28	0.26	0.46	0.28	0.28	0.60
N _Ly	log (s^-1)	46.9	46.7	47.6	46.0	47.2	47.2
H₂O integrated flux	mJy	400	447	490	355	575	310

Notes.

^(a)

Classification (Low and High) by Palla et al. (1991).

^(b)

Classification (Type 1, Type 2 and Type 3) by Molinari et al. (2008) and this work.

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