A catalogue of absorption-line systems in QSO spectra

Abstract

Abstract. We present a new catalog of absorption-line systems identified in the quasar spectra. It contains data on 821 QSOs and 8558 absorption systems comprising 16 139 absorption lines with measured redshifts in the QSO spectra. The catalog includes absorption-line systems consisting of lines of heavy elements, lines of neutral hydrogen, Lyman limit systems, damped Lyα absorption systems, and broad absorption-line systems. Using the data of the present catalog we also discuss redshift distributions of absorption-line systems.

NEW HIGH-z FERMI BL LACS WITH THE PHOTOMETRIC DROPOUT TECHNIQUE

“…As seen in this figure, both approaches are consistent with each other. The spectroscopic redshift for the source, 3FGL J1312.5-2155, has been determined by using the absorption features, i.e., C IV and Mg II (Ryabinkov et al 2003), which could possibly imply a lower limit. This comparison demonstrates that our photometric campaign is an efficient way to uncover rare high-redshift BL Lacs.…”

Large-scale periodicity in the distribution of QSO absorption-line systems

“…On the other hand, possible simulated periodicities at z e = 0.258, 0.312, and 0.44 in the z e -distribution of QSOs indicated by Hartnett Fig. 7 Upper panel: power spectrum P(k) calculated with using (2) for 730 QSOs (0.035 ≤ z e ≤ 5.01) from the catalogue Ryabinkov et al (2003), whose spectra include 2 322 ALSs used in the present analysis. The interval of harmonic numbers 25 ≤ k ≤ 70 corresponds to comoving scales (233.3 − 83.3)h −1 Mpc, at Ω m = 0.23.…”

“…1 demonstrates three z-distributions N AS (z) of ALSs containing absorption lines of heavy Junkkarinen et al (1991), thin dashed lines-2 003 systems-from the catalog by Ryabinkov et al (2003), thick lines-2 322 systems-from the same but updated catalog. Lower panel: same as in the upper panel but for corresponding η-distributions (see text) within the appropriate interval η = 0.0-1.87 with an averaging bin η = 0.018 and a step of shifting δ η = 0.005 elements within the redshift interval z = 0.0-4.3.…”

“…Lower panel: same as in the upper panel but for corresponding η-distributions (see text) within the appropriate interval η = 0.0-1.87 with an averaging bin η = 0.018 and a step of shifting δ η = 0.005 elements within the redshift interval z = 0.0-4.3. One of them is obtained using 847 systems from the catalog by Junkkarinen et al (1991), the second one is based on 2003 systems registered in the spectra of 661 QSOs (emission redshifts z e = 0.29-4.9) from the catalog by Ryabinkov et al (2003). The third one is the z-distribution of 2322 ALSs registered in the spectra of 730 QSOs (z e = 0.035-5.01) from the same but updated catalog.…”

“…Lower panel: comparison of two histograms displaying distributions of 478 Mg II absorption systems from the catalog byRyabinkov et al (2003) (thick solid lines) and 1 806 Mg II systems from the catalog byBouché et al (2006) (long dashed lines) with respect to the rest-frame equivalent width W r panel inFig. 7represents the power spectrum P(k) calculated according to (2) for 730 original QSOs within an interval of η e = 0.035-1.98 (z e = 0.035-5.01) sampled for the statistical treatment of 2 322 ALSs.…”