2003A&A...403..573L


Query : 2003A&A...403..573L

2003A&A...403..573L - Astronomy and Astrophysics, volume 403, 573-584 (2003/5-4)

Distinct abundance patterns in multiple damped Lyα galaxies: Evidence for truncated star formation?

LOPEZ S. and ELLISON S.L.

Abstract (from CDS):

Following our previous work on metal abundances of a double damped Lyα system with a line-of-sight separation ∼2000km/s (Ellison & Lopez, 2001A&A...380..117E), we present VLT UVES abundances of 3 new systems spanning a total of ∼6000km/s at z∼2.5 toward the southern QSO CTQ247. These abundances are supplemented with echelle observations of another ``double'' damped Lyα system in the literature. We propose a definition in terms of velocity shift of the sub-class ``multiple damped Lyα system'', which is motivated by its possible connection with large-scale structure. We find that the abundance ratio [S/Fe] is systematically low in multiple systems compared with single systems, and with a small scatter. The same behavior is found in 2 more single DLA systems taken from the literature that show evidence of belonging to a galaxy group. Although [Si/Fe] ratios are also generally lower in multiple DLAs than in single DLAs, the effect is less striking since the scatter is larger and there are a number of low [Si/Fe] DLAs in the literature. We suggest that this can be explained with a combination of detection bias and, to a lesser extent, the scatter in ionization corrections for different absorbers. We investigate whether consistently low α/Fe ratios could be due to dust depletion or ionization corrections and find that the former effect would emphasize the observed trend of low α/Fe in multiple systems even further. Ionization may have a minor effect in some cases, but at a level that would not change our conclusions. We thus conclude that the low α/Fe ratios in multiple DLAs have a nucleosynthetic origin and suggest that they could be explained by reduced star formation in multiple damped Lyα systems, possibly due to environmental effects. There seems to be independent evidence for this scenario from the mild odd-even effect and from the relatively high N/α ratios we observe in these multiple systems.

Abstract Copyright:

Journal keyword(s): quasars: general - quasars: absorption lines - quasars: individual: CTQ247 - galaxies: evolution - galaxies: clusters: general

Nomenclature: Table 3: [LE2003] QHHMM+DDA, [LE2003] QHHMM+DDdA, [LE2003] QHHMM+DDMMA, N=11, [LE2003] CTQ 247A (Nos A-C).

CDS comments: T.3: Q2314-409A and B = [EYH2001] B2314-409a and b.

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LBQS 2359-0216B QSO 00 01 49.9509602856 -01 59 39.455306448   18 18.0     ~ 102 0
2 LBQS 0013-0029 QSO 00 16 02.4050159808 -00 12 25.077257064   18.67 18.36     ~ 187 0
3 PHL 957 QSO 01 03 11.2741573824 +13 16 17.809871484   16.97 16.57     ~ 335 0
4 QSO J0152+3350 QSO 01 52 34.5766588080 +33 50 33.159720264   18.5 18.5     ~ 118 1
5 QSO B0201+113 QSO 02 03 46.6570697736 +11 34 45.410523492   19.5 19.5 19.41   ~ 193 1
6 7C 020156.39+363507.00 QSO 02 04 55.5959081688 +36 49 17.992097868     18.1     ~ 116 1
7 QSO B0216+0803 QSO 02 18 57.3582544488 +08 17 27.346030260     18.1     ~ 89 0
8 QSO B0255+001 QSO 02 57 51.5461129008 +00 20 45.532342212   20.05 19.64     ~ 35 0
9 QSO J0307-4945 QSO 03 07 22.8949808808 -49 45 48.274545240     18.76     ~ 57 0
10 QSO B0336-017 QSO 03 39 00.9863790624 -01 33 17.608676436   20.1 19.1 18.8   ~ 106 2
11 QSO B0347-383 QSO 03 49 43.6603590912 -38 10 30.825444900     17.3     ~ 187 0
12 QSO J0407-4410 QSO 04 07 18.0880236912 -44 10 13.983623724   17.6 17.6     ~ 93 0
13 QSO J0745+4734 QSO 07 45 21.7878198936 +47 34 36.191801820   16.76 16.44     ~ 96 0
14 QSO B0836+1122 QSO 08 39 32.9958412872 +11 12 06.594966828     18.8     ~ 88 0
15 QSO B0957+33 QSO 09 57 44.4641685312 +33 08 20.768397468   20.70 19.42     ~ 61 0
16 QSO B1104-181 QSO 11 06 33.3845199936 -18 21 23.829049296   15.8 15.9 15.7   ~ 313 1
17 QSO B1108-07 QSO 11 11 13.600 -08 04 02.00     18.10     ~ 69 0
18 LBQS 1210+1731 QSO 12 13 03.0135468360 +17 14 23.237180160   18.21 18.03     ~ 81 0
19 QSO J1217+3305 QSO 12 17 32.5421411376 +33 05 38.030803980     17.5 17.7   ~ 112 1
20 LBQS 1223+1753 QSO 12 26 07.1946195816 +17 36 49.921603812   18.93 18.59     ~ 107 0
21 QSO B1331+170 QSO 13 33 35.7827544072 +16 49 04.013500728   16.84 16.71 16.41   ~ 426 0
22 QSO B1409+0930 QSO 14 12 17.2929417480 +09 16 24.707943048     18.6     ~ 60 0
23 QSO B1759+7539 BLL 17 57 46.3590423768 +75 39 16.181909928     16.50     ~ 84 0
24 QSO B1946+770 QSO 19 44 54.8532392016 +77 05 52.673448048     15.8     ~ 146 0
25 QSO B2206-1959 QSO 22 09 00.6950774976 -19 44 19.743416484     18.65     ~ 82 0
26 KODIAQ J223235+024755 QSO 22 32 35.2154152488 +02 47 55.814764596   18.387 18.038     ~ 91 0
27 FIRST J223400.0-003315 QSO 22 33 59.9314052040 -00 33 15.796616148   18.19 17.76     ~ 39 0
28 QSO B2237-0607 QSO 22 39 53.6812264896 -05 52 19.996061772     18.3     ~ 108 0
29 QSO J2246-6015 QSO 22 47 08.9258659440 -60 15 45.299400480           ~ 65 0
30 QSO B2314-409 QSO 23 16 46.9200325176 -40 41 21.090064236   17.9 17.9     ~ 65 1
31 QSO B2344+125 QSO 23 46 32.80 +12 45 40.0     17.0     ~ 82 1
32 QSO B2348-0108 QSO 23 50 57.8771296800 -00 52 09.886281492   19.23 18.77 18.7   ~ 143 0

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2022.08.09-02:55:07

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