Are infrared dark clouds really quiescent? | Astronomy & Astrophysics (A&A)

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Table 2

SMA observations toward four IRDCs: phase center of each source and the synthetic image quality at different configurations.

Source		G28.34 S	IRDC 18530	IRDC 18306	IRDC 18308

RA	[J2000]	18^h42^m47^s	18^h55^m30^s	18^h33^m32^s	18^h33^m35^s
Dec	[J2000]	−04°04′07′′	02°17′06′′	−08°32′27′′	−08°35′53′′
D	(kpc)	4.8	4.6	3.6	4.4
V _lsr	(km s^-1)	78.4	75.9	54.8	73.7

COMP^a	(Maj × Min, P.A)	3.47′′ × 1.79′′, 32.8°	3.29′′ × 1.77′′, 34.8°	3.28′′ × 2.17′′, −7.7°	3.26′′ × 2.14′′, 9.6°
COMP^a	σ_conti^d (mJy/beam)	1.00	0.86	1.28	1.40
	σ_line^e (mK)	78	83	146	162

EXT^b	(Maj × Min, P.A)	0.88′′ × 0.69′′, −82.2°	0.88′′ × 0.67′′, −78.9°	0.93′′ × 0.79′′, −85.4°	0.93′′ × 0.79′′, −88.6°
EXT^b	σ_conti^d (mJy/beam)	1.26	1.29	1.31	1.29
	σ_line^e (mK)	161	167	141	160

COMP+EXT^c	(Maj × Min, P.A)	2.55′′ × 1.51′′, 33.5°	2.44′′ × 1.49′′, 35.1°	1.79′′ × 1.56′′, 5.9°	1.67′′ × 1.50′′, 9.6°
COMP+EXT^c	σ_conti^d (mJy/beam)	0.97	0.77	0.99	0.98
	σ_line^e (mK)	54	65	268	324

Notes.

^(a)

Synthetic beam of compact configuration.

^(b)

Synthetic beam of extended configuration.

^(c)

Synthetic beam of compact+extended configuration, combined with the “natural weighting”.

^(d)

1σ rms measured from the continuum map of each source.

^(e)

1σ rms measured from the primary beam averaged spectrum of each source, which is converted into brightness temperature.

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