SIMBAD references

2002ApJ...572L...7T - Astrophys. J., 572, L7-L10 (2002/June-2)

The nondamped nature of 12 low-redshift damped Lyα candidate systems.

TURNSHEK D.A. and RAO S.M.

Abstract (from CDS):

Hubble Space Telescope (HST) UV spectroscopy of 12 candidate low-redshift damped Lyα (DLA) systems in 11 quasi-stellar objects (z=0.103 in Q0054+144, z=0.969 and z=0.987 in Q0302-223, z=0.478 in Q0454-220, z=1.476 in Q1047+550, z=1.070 in Q1206+459, z=1.228 in Q1247+267, z=0.399 in Q1318+290B, z=0.519 in Q1329+412, z=0.276 in Q1451-375, z=0.204 in Q2112+059, z=0.263 in Q2251+113) are presented; the observations demonstrate that they are not DLAs with N_HI_≥2x1020 atoms cm–2. In all cases except two, the systems either do not exist or are well below the DLA threshold column density; the exceptions are a z=0.474 system in Q0454-220 that has N_HI_=3x1019 atoms cm–2 and a z=1.223 system in Q1247+267 that has N_HI_=8x1019 atoms cm–2. Thus, observations of these objects in the Chandra, Gemini, and HST archives are not suitable for doing follow-up work on low-redshift DLAs. Furthermore, these results indicate that the low-redshift DLA statistics derived from International Ultraviolet Explorer spectra and presented by Lanzetta, Wolfe, & Turnshek and Wolfe et al. in 1995 are invalid.

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Journal keyword(s): Galaxies: Formation - Galaxies: Quasars: Absorption Lines - Galaxies: Quasars: Individual: Alphanumeric: Q0054+144 - Galaxies: Quasars: Individual: Alphanumeric: Q0215+015 - Galaxies: Quasars: Individual: Alphanumeric: Q0302-223 - Galaxies: Quasars: Individual: Alphanumeric: Q0454-220 - Galaxies: Quasars: Individual: Alphanumeric: Q0935+417 - Galaxies: Quasars: Individual: Alphanumeric: Q1047+550 - Galaxies: Quasars: Individual: Alphanumeric: Q1206+459 - Galaxies: Quasars: Individual: Alphanumeric: Q1247+267 - Galaxies: Quasars: Individual: Alphanumeric: Q1318+290B - Galaxies: Quasars: Individual: Alphanumeric: Q1329+412 - Galaxies: Quasars: Individual: Alphanumeric: Q1451-375 - Galaxies: Quasars: Individual: Alphanumeric: Q2112+059 - Galaxies: Quasars: Individual: Alphanumeric: Q2223-052 - Galaxies: Quasars: Individual: Alphanumeric: Q2251+113

Simbad objects: 14

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