A submillimetre search for pre- and proto-brown dwarfs in Chamaeleon II

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Volume 590 (June 2016)

A&A, 590 (2016) A79

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Table 2

Properties of the submillimetre cores detected at 870 μm in Cha II.

Core	RA^a	Dec^a	S _{870_μm} ^b	rms	Mass	Deconvolved ^c	n _core	n _crit ^d	Sep.^e	Counterpart?
	(J2000)	(J2000)	(mJy)	(mJy)	(M_⊙)	ang. size	(cm^-3)	(cm^-3)	(“)

ChaII-APEX-A	12:53:30.5	–77:11:07	26	5	0.016	Point-like	...	4.3 × 10⁷	7′′, 10′′	No (Background star)
ChaII-APEX-B	12:54:17.3	–77:10:23	26	5	0.016	Point-like	...	4.3 × 10⁷	15′′	No (Background star)
ChaII-APEX-C	12:56:03.3	–77:11:43	36^f	6	0.022	35′′	2.2 × 10⁴	2.3 × 10⁷	12′′, 14′′	No (Background star)
ChaII-APEX-D	12:53:42.6	–77:15:11	109	5	0.066	Point-like	...	2.5 × 10⁶	1′′	Yes (YSO IRAS 12500-7658)
ChaII-APEX-E	12:53:39.0	–77:16:35	460 ^f	5	0.279	75′′	2.8 × 10⁴	1.4 × 10⁵	...	No
ChaII-APEX-F	12:54:21.9	–77:06:59	35	5	0.021	Point-like	...	2.5 × 10⁷	...	No
ChaII-APEX-G	12:54:12.3	–77:06:47	130^f	5	0.079	45′′	3.7 × 10⁴	1.7 × 10⁶	11′′	No (Background star)
ChaII-APEX-H	12:54:40.8	–77:04:35	49^f	6	0.030	35′′	3.1 × 10⁴	1.2 × 10⁷	4′′, 14′′, 16′′	No (Background star)
ChaII-APEX-I	12:54:27.7	–77:04:27	30	6	0.018	Point-like	...	3.4 × 10⁷	13′′	No (Background star)
ChaII-APEX-J	12:53:44.8	–77:04:43	39^f	6	0.024	40′′	1.5 × 10⁴	1.9 × 10⁷	18′′	No (Background star)
ChaII-APEX-K	12:53:17.3	–77:07:11	1745	4	1.059	Point-like	...	9.7 × 10³	0.5′′	Yes (YSO DK Cha)
ChaII-APEX-L	12:52:55.8	–77:07:35	78	5	0.047	Point-like	...	4.9 × 10⁶	1′′	Yes (Proto-BD candidate)
ChaII-APEX-M	12:52:39.0	–77:07:59	3700^f	4	2.246	80′′	1.8 × 10⁵	2.2 × 10³	...	No
ChaII-APEX-N	12:51:55.8	–77:08:43	30	5	0.018	Point-like	...	3.4 × 10⁷	16′′	No (Background star)
ChaII-APEX-O	12:51:39.0	–77:08:55	260^f	6	0.158	55′′	4.0 × 10⁴	4.4 × 10⁵	13′′, 16′′	No (Background star)

Notes.

^(a)

Position of the maximum emission of the cores. Units of right ascension are hours, minutes, and seconds. Units of declination are degrees, arcminutes, and arcseconds.

^(b)

Flux density computed above 3σ emission.

^(c)

Deconvolved size after fitting a Gaussian to the cores. The averaged of the major and minor axis is represented.

^(d)

Critical density of the core, calculated following the equation in Sect. 4.4.

^(e)

Separation of the counterpart candidates to the nominal position of the submillimetre core.

^(f)

For cores showing extended emission we applied a specific data processing (using option “extended” in CrUSH) to avoid filtering out extended structures.

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