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Table 3

Main optical spectroscopic information concerning BL Lac objects in our sample with detected redshifted spectral lines.

Object Average Line λ obs Redshift Type* EW Observed
redshift (Å) (Å) flux

1FGL J0648.8+1516 0.179
Caii H 4634 0.178 g 1.8 ± 0.4 −7.0 ± 1.4
Caii K 4678 0.179 g 1.8 ± 0.4 −7.4 ± 1.5
G-band 5080 0.180 g 1.9 ± 0.4 −7.1 ± 1.4
Mg b 6104 0.180 g 3.7 ± 0.6 −13 ± 2
1FGL J1419.7+7731 0.014
Caii H 3988 0.014 a? 1.2 ± 0.4 −2.4 ± 0.8
Caii K 4020 0.013 a? 2.7 ± 0.6 −7.0 ± 1.5
G-band 4364 0.014 a? 3.8 ± 0.8 −10 ± 2
Hα 6662 0.015 a? 1.4 ± 0.4 −1.8 ± 0.5
1FGL J1553.5−3116 0.132
Hα? 7431 0.132 a? 3.8 ± 0.8 −8.2 ± 1.7
1FGL J1643.5−0646 0.081
G-band 4645 0.079 g 7.7 ± 1.9 −2.1 ± 0.4
Mg b 5586 0.079 g 12.9 ± 1.3 −5.3 ± 0.5
Na D 6377 0.082 g 8.5 ± 1.3 −4.4 ± 0.7
[N ii]? 7124 0.082 e −10 ± 2 5.3 ± 1.1
1FGL J1841.9+3220 0.028
Caii H 4044 0.028 a? 0.8 ± 0.2 −1.9 ± 0.6
Caii K 4074 0.027 a? 0.8 ± 0.2 −2.0 ± 0.6
1FGL J1926.8+6153 0.012
Caii H 3979 0.011 a? 1.4 ± 0.2 −13 ± 2
Caii K 4015 0.012 a? 1.1 ± 0.2 −9.7 ± 1.9
1FGL J1933.3+0723 0.010
Caii H 3976 0.011 a? 1.3 ± 0.2 −3.2 ± 0.5
Caii K 4005 0.009 a? 0.84 ± 0.17 −2.1 ± 0.4
1FGL J2042.2+2427 0.105
Caii H 4348 0.105 g 7.6 ± 0.8 −28 ± 3
Caii K 4381 0.104 g 7.0 ± 0.7 −26 ± 3
G-band 4749 0.103 g 5.1 ± 0.5 −22 ± 2
Mg b 5720 0.105 g 7.4 ± 0.7 −39 ± 4
Na D 6512 0.106 g 4.4 ± 0.4 −24 ± 2
[N ii] 7276 0.105 e −1.9 ± 0.4 9.4 ± 1.9

Notes. Fluxes are in units of 10-16 erg cm-2 s-1 and are not corrected for intervening Galactic absorption. a: absorption line from intervening system).

(*)

Type of spectral line (e: emission line; g: absorption line from the host galaxy;

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