Search for cold gas in strong Mg II absorbers at 0.5 < z < 1.5: nature and evolution of 21-cm absorbers

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Volume 544 (August 2012)

A&A, 544 (2012) A21

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Table 5

Fraction of 21-cm absorption detections (C) and the number density of 21-cm absorbers (n₂₁) for the different 21-cm optical depth limits () using the homogeneous sample S1.

z range	Sample		Systems (N)	Detections (N₂₁)	C	n₂₁
		(km s^-1)

1.1–1.5	Ours (i.e. this paper + G09)	0.10	8	4	0.50	0.13
		0.20	22	4	0.18	0.05
		0.30	27	3	0.11	0.03
		0.50	36	4	0.11	0.03
1.1–1.5	Ours + literature	0.10	10	5	0.50	0.13
		0.20	26	5	0.19	0.05
		0.30	32	4	0.13	0.03
		0.50	41	5	0.12	0.03
1.1–1.5	Ours + literature with VLBA	0.10	4	2	0.50	0.13
	(assuming f_c = c_f)	0.20	8	1	0.13	0.03
		0.30	10	1	0.10	0.03
		0.50	16	2	0.13	0.03
1.1–1.5	Ours + literature with VLBA	0.10	4	2	0.50	0.13
	(assuming f_c = f_VLBA)	0.20	8	1	0.13	0.03
		0.30	13	1	0.08	0.02
		0.50	17	3	0.18	0.05
0.5–1.0	Ours	0.10	4	1	0.25	0.04
		0.20	6	1	0.17	0.03
		0.30	8	1	0.13	0.02
		0.50	9	1	0.11	0.02
0.5–1.0	Ours + literature	0.10	20	3	0.15	0.03
		0.20	25	3	0.12	0.02
		0.30	28	3	0.11	0.02
		0.50	33	2	0.06	0.01
0.5–1.0	Ours + literature with VLBA	0.10	5	2	0.40	0.07
	(assuming f_c = c_f)	0.20	10	2	0.20	0.04
		0.30	12	2	0.17	0.03
		0.50	15	2	0.13	0.02
0.5–1.0	Ours + literature with VLBA	0.10	5	2	0.40	0.07
	(assuming f_c = f_VLBA)	0.20	11	2	0.18	0.03
		0.30	14	2	0.14	0.03
		0.50	15	2	0.13	0.02

Notes. N is the total number of systems in the sample with , and N₂₁ is the number of 21-cm detections with and .

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