Diffuse molecular gas at high redshift - Detection of CO molecules and the 2175 Å dust feature at z = 1.64

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Volume 503 / No 3 (September I 2009)

A&A, 503 3 (2009) 765-770

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Table 1:

Results of Voigt-profile fitting to detected lines at $z\sim 1.64$ in the spectrum of Q 1604+2203.
Comp.^a	z	b ( $\ensuremath{{\rm km~s^{-1}}}$ )	$\log N(X)$ ( $\ensuremath{{\rm cm}^{-2}}$ )
Comp.^a	z	b ( $\ensuremath{{\rm km~s^{-1}}}$ )	Zn II	Fe II	Si II	Mg I	S I	CO
1B	1.63967	17.8 $\pm$ 0.8	12.31 $\pm$ 0.03	13.73 $\pm$ 0.02
2N	1.63992	6.3 $\pm$ 0.4	12.34 $\pm$ 0.05			12.85 $\pm$ 0.04	13.18 $\pm$ 0.02	$\le$ 13.64
2B	1.63996	11.4 $\pm$ 0.3	12.09 $\pm$ 0.11	14.10 $\pm$ 0.01	14.72 $\pm$ 0.03
3N	1.64028	2.8 $\pm$ 0.6	12.07 $\pm$ 0.04				12.64 $\pm$ 0.05	$\le$ 13.28
3B	1.64034	37.6 $\pm$ 1.4	12.67 $\pm$ 0.04	14.00 $\pm$ 0.02	14.52 $\pm$ 0.09
4N	1.64080	4.5 $\pm$ 0.4	12.06 $\pm$ 0.05	13.29 $\pm$ 0.04	13.96 $\pm$ 0.13	12.73 $\pm$ 0.03	13.01 $\pm$ 0.02	$\le$ 13.80
5N	1.64069	6.8 $\pm$ 0.3	12.70 $\pm$ 0.03	14.08 $\pm$ 0.01	14.45 $\pm$ 0.05
5N	1.64071	3.6 $\pm$ 0.4				12.66 $\pm$ 0.04	13.10 $\pm$ 0.02	14.24 $\pm$ 0.20
6N	1.64083	3.9 $\pm$ 0.3	12.42 $\pm$ 0.02	13.67 $\pm$ 0.02	14.02 $\pm$ 0.10	12.33 $\pm$ 0.07	13.13 $\pm$ 0.02	14.34 $\pm$ 0.10
Total			13.30 $\pm$ 0.02	14.67 $\pm$ 0.01	15.13 $\pm$ 0.03	13.28 $\pm$ 0.02	13.75 $\pm$ 0.01	14.59 $\pm$ 0.11 ^b

^a Narrow components ( $b<10~\ensuremath{{\rm km~s^{-1}}}$ ) are indicated by ``N'' while ``B'' stands for broad component ( $b>10~\ensuremath{{\rm km~s^{-1}}}$ ); ^b total N(CO) measured from comp. 5 and 6 only. Undetected components (2N, 3N and 4N) could increase this value by up to 0.1 dex (see text).

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