2002ApJ...572L...7T

Query : 2002ApJ...572L...7T

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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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [OKM2018] SWIFT J0056.9+1472 Sy1 00 57 09.9306975096 +14 46 10.142054004   16.56 16.29     ~ 167 0
2 QSO J0217+0144 Bla 02 17 48.95475095 +01 44 49.6990271   16.74 16.09 18.51 13.29 ~ 455 1
3 QSO J0304-2211 QSO 03 04 49.8652311288 -22 11 51.882127548   16.43 16.40     ~ 111 0
4 QSO J0456-2159 Bla 04 56 08.9237717400 -21 59 09.399816312 15.76 16.16 16.10 15.9   ~ 196 1
5 US 796 QSO 09 38 57.0175740480 +41 28 21.216772452   16.94 16.75     ~ 144 1
6 QSO B1047+550 QSO 10 50 45.7173070368 +54 47 19.251780108   17.13 16.98     ~ 51 0
7 QSO J1208+4540 QSO 12 08 58.0107013896 +45 40 35.421692952   16.00 15.70     ~ 194 0
8 LB 19 QSO 12 50 05.7146863848 +26 31 07.598352000   16.12 15.92     ~ 207 0
9 Ton 156 QSO 13 21 15.8594008584 +28 47 19.492704528   16.88 16.69     ~ 103 0
10 QSO J1331+4101 QSO 13 31 41.1396131064 +41 01 58.778510304   17.52 17.41     ~ 111 0
11 QSO B1451-375 Bla 14 54 27.40976313 -37 47 33.1448219   16.36 16.69 16.14   ~ 201 1
12 2MASS J21145258+0607423 Sy1 21 14 52.5774985320 +06 07 42.433198104   16.06 15.77     ~ 227 0
13 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 863 1
14 4C 11.72 BLL 22 54 10.4214226080 +11 36 38.748083760   16.02 15.82     ~ 351 1

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