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Table 2

Redshift lower limits and properties of observed sources.

Object a R b E W min c S/Nd α e M R f N/H ratiog z h δ opt i
PG 1553+113 13.80 0.04 140 ± 30 0.90 ≤–27.2 50 ≥0.30 ≥700
H 1722+119 14.90 0.07 80 ± 20 1.00 ≤–26.3 25 ≥0.35 ≥400
MH 2136-428 15.80 0.06 100 ± 30 0.75 ≤–26.0 15 ≥0.50 ≥500
PKS 2254-204 17.10 0.10 60 ± 10 0.75 ≤–25.4 10 ≥0.65 ≥300

Notes.

(a)

IAU name.

(b)

R band apparent magnitude measured from our spectrum.

(c)

Average EW min in the range 4000−8000Å.

(d)

Average S/N in the range 4000−8000Å.

(e)

Spectral index.

(f)

Nucleus absolute magnitude limit in R band computed assuming lower limit on the z.

(g)

Lower limit of nucleus-to-host ratio by assuming BL Lac host galaxy standard candle with Mr = −22.90.

(h)

Redshift lower limit.

(i)

Optical beaming factor computed by following the procedure described in Landoni et al. (2013).

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