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Home All issues Volume 503 / No 3 (September I 2009) A&A, 503 3 (2009) 731-746 Full HTML
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Table 2:

Voigt component fits to DLA/sub-DLA N I.
QSO $z_{\rm abs}$a log N(H I) Tripletsb v0 b log N [N/H]c [N/Si]d Ref.e
        (km s-1) (km s-1) (N in cm-2)      
J1014+4300 2.95880 20.50 $\pm$ 0.02 N I 1134, 1200 2 $\pm$ 2 9 $\pm$ 1 14.33 $\pm$ 0.05 -2.02 $\pm$ 0.17 -1.31 $\pm$ 0.22 -
        20 $\pm$ 3 6 $\pm$ 5 13.63 $\pm$ 0.24      
J1211+0422 2.37655 20.80 $\pm$ 0.10 N I 1134, 1200 -10 $\pm$ 2 7 $\pm$ 1 13.99 $\pm$ 0.04 -2.29 $\pm$ 0.11 -0.88 $\pm$ 0.14 1
        0 $\pm$ 2 4 $\pm$ 1 13.85 $\pm$ 0.07      
        14 $\pm$ 2 7 $\pm$ 1 14.04 $\pm$ 0.03      
J1757+7539 2.62530 20.76 $\pm$ 0.02 N I 1134, 1200 -21 $\pm$ 3 17 $\pm$ 2 14.57 $\pm$ 0.08 -1.61 $\pm$ 0.07 -0.82 $\pm$ 0.07 2
        -2 $\pm$ 2 10 $\pm$ 1 14.63 $\pm$ 0.07      
        23 $\pm$ 2 8 $\pm$ 1 14.60 $\pm$ 0.02      
Q0042-2930 1.80947 20.40 $\pm$ 0.10 N I 1200 9 $\pm$ 2 8 $\pm$ 2 14.06 $\pm$ 0.05 -2.26 $\pm$ 0.12 -1.01 $\pm$ 0.19 -
Q0450-1310 2.06655 20.50 $\pm$ 0.07 N I 1134, 1200 -5 $\pm$ 2 10 $\pm$ 3 13.27 $\pm$ 0.08 -2.83 $\pm$ 0.10 -1.38 $\pm$ 0.11 2, 3
        26 $\pm$ 3 14 $\pm$ 3 13.32 $\pm$ 0.07      
Q1242+0006 1.82452 20.45 $\pm$ 0.10 N I 1134, 1200 0 $\pm$ 2 8 $\pm$ 2 14.19 $\pm$ 0.06 -2.19 $\pm$ 0.13 -1.15 $\pm$ 0.14 -
Q1331+1704 1.77635 21.15 $\pm$ 0.07 N I 1134, 1200 6 $\pm$ 2 13 $\pm$ 1 15.06 $\pm$ 0.06 -1.89 $\pm$ 0.10 -0.49 $\pm$ 0.11 2, 4
        19 $\pm$ 3 5 $\pm$ 2 14.24 $\pm$ 0.25      
        44 $\pm$ 2 11 $\pm$ 1 14.26 $\pm$ 0.02      
        69 $\pm$ 2 8 $\pm$ 1 13.47 $\pm$ 0.04      
Q2243-6031 2.33061 20.65 $\pm$ 0.05 N I 1134, 1200 -1 $\pm$ 2 7 $\pm$ 1 14.59 $\pm$ 0.03 -1.99 $\pm$ 0.08 -1.14 $\pm$ 0.09 2, 5
Q2348-1444 2.27940 20.56 $\pm$ 0.08 N I 1200 -2 $\pm$ 2 4 $\pm$ 2 13.06 $\pm$ 0.09 -3.43 $\pm$ 0.26 -1.51 $\pm$ 0.26 2, 6
Q0237-2321 1.67234 19.65 $\pm$ 0.10 N I 1200 1 $\pm$ 2 6 $\pm$ 2 13.39 $\pm$ 0.06 -2.19 $\pm$ 0.25 -1.93 $\pm$ 0.27 -
Q1037-2704 2.13906 19.70 $\pm$ 0.05 N I 1134, 1200 -8 $\pm$ 3 7 $\pm$ 2 13.02 $\pm$ 0.16 -1.60 $\pm$ 0.08 -1.58 $\pm$ 0.13 7
        7 $\pm$ 2 9 $\pm$ 2 13.55 $\pm$ 0.05      
        43 $\pm$ 2 8 $\pm$ 1 13.78 $\pm$ 0.02      
a The DLAs at z = 2.81115 toward Q0528-2505, z = 1.96221 toward Q0551-3637, and z = 3.09240 toward J2100-0641 exhibit fully saturated N I profiles, and N abundances could not be extracted.
b The triplets used to measure the N I absorption: N I $\lambda\lambda$ 1134.165, 1134.415, 1134.980 and N I $\lambda\lambda$ 1199.550, 1200.223, 1200.710.
c Nitrogen abundance relative to solar where log (N/H)$_\odot$ = -4.07 (Holweger 2001). Errors were formed by adding in quadrature the logarithmic errors on N(N I), N(H I), and an additional 0.05 dex allowing for uncertainties in the solar nitrogen abundance.
d Nitrogen-to-silicon ratio.
e All measurements in this table have been made by us. However, in several cases, [N/H] has been determined previously: 1 Lehner et al. (2008); 2 Henry & Prochaska (2007); 3 Dessauges-Zavadsky et al. (2006); 4 Dessauges-Zavadsky et al. (2004); 5 Lopez et al. (2002); 6 Pettini et al. (1995); 7 Srianand & Petitjean (2001). Our results generally agree with previous results within the errors; for the DLA toward Q2348-1444, our value for log N(N I) is consistent with the upper limit log N(N I) < 13.48 reported by Pettini et al. (1995).

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