2014A&A...566A..24N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:46:31

2014A&A...566A..24N - Astronomy and Astrophysics, volume 566A, 24-24 (2014/6-1)

A connection between extremely strong damped Lyman-α systems and Lyman-α emitting galaxies at small impact parameters.

NOTERDAEME P., PETITJEAN P., PARIS I., CAI Z., FINLEY H., GE J., PIERI M.M. and YORK D.G.

Abstract (from CDS):

We present a study of ∼100 high redshift (z ∼2-4) extremely strong damped Lyman-α systems (ESDLA, with N(HI)≥0.5x1022cm–2) detected in quasar spectra from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS-III) Data Release 11. We study the neutral hydrogen, metal, and dust content of this elusive population of absorbers and confirm our previous finding that the high column density end of the N(HI) frequency distribution has a relatively shallow slope with power-law index -3.6, similar to what is seen from 21-cm maps in nearby galaxies. The stacked absorption spectrum indicates a typical metallicity ∼1/20th solar, similar to the mean metallicity of the overall DLA population. The relatively small velocity extent of the low-ionisation lines suggests that ESDLAs do not arise from large-scale flows of neutral gas. The high column densities involved are in turn more similar to what is seen in DLAs associated with gamma-ray burst afterglows (GRB-DLAs), which are known to occur close to star-forming regions. This indicates that ESDLAs arise from a line of sight passing at very small impact parameters from the host galaxy, as observed in nearby galaxies. This is also supported by simple theoretical considerations and recent high-z hydrodynamical simulations. We strongly substantiate this picture by the first statistical detection of Lyα emission with <LESDLA(Lyα)≥~(0.6±0.2)x1042erg/s in the core of ESDLAs (corresponding to about 0.1L* at z∼2-3), obtained through stacking the fibre spectra (of radius 1" corresponding to ∼8kpc at z∼2.5). Statistical errors on the Lyα luminosity are of the order of 0.1x1042erg/s but we caution that the measured Lyα luminosity may be overestimated by ∼35% due to sky light residuals and/or FUV emission from the quasar host and that we have neglected flux-calibration uncertainties. We estimate a more conservative uncertainty of 0.2x1042erg/s. The properties of the Lyα line (luminosity distribution, velocity width and velocity offset compared to systemic redshift) are very similar to that of the population of Lyman-α emitting galaxies (LAEs) with LLAE(Lyα)≥1041erg/s detected in long-slit spectroscopy or narrow-band imaging surveys. By matching the incidence of ESDLAs with that of the LAEs population, we estimate the high column density gas radius to be about rgas=2.5kpc, i.e., significantly smaller than the radius corresponding to the BOSS fibre aperture, making fibre losses likely negligible. Finally, the average measured Lyα luminosity indicates a star-formation rate consistent with the Schmidt-Kennicutt law, SFR (M/yr)≃0.6/fesc, where fesc<1 is the Lyα escape fraction. Assuming the typical escape fraction of LAEs, fesc∼0.3, the Schmidt-Kennicutt law implies a galaxy radius of about rgal≃2.5kpc. Finally, we note that possible overestimation of the Lyα emission would result in both smaller rgas and rgal. Our results support a close association between LAEs and strong DLA host galaxies.

Abstract Copyright:

Journal keyword(s): quasars: absorption lines - galaxies: high-redshift - galaxies: ISM - galaxies: star formation

VizieR on-line data: <Available at CDS (J/A+A/566/A24): table2.dat>

Simbad objects: 108

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Number of rows : 108

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SDSS J001743.88+130739.8 QSO 00 17 43.8811845169 +13 07 39.808960750           ~ 4 0
2 SDSS J002503.02+114547.8 QSO 00 25 03.0245655569 +11 45 47.781378874           ~ 4 0
3 QSO B0027-1836 QSO 00 30 23.6257396463 -18 19 56.118776105   18.2 17.9     ~ 43 0
4 SDSS J004349.39-025401.9 QSO 00 43 49.3905831512 -02 54 01.845596238           ~ 7 0
5 SDSS J004810.36+213818.3 QSO 00 48 10.3725595741 +21 38 18.418520478           ~ 3 0
6 SDSS J004953.46+012217.4 QSO 00 49 53.461 +01 22 17.40           ~ 4 0
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
8 SDSS J005954.31+045941.2 QSO 00 59 54.3108016905 +04 59 41.247148529           ~ 6 0
9 SDSS J010029.30+290100.4 QSO 01 00 29.307 +29 01 00.44           ~ 3 0
10 SDSS J010153.02+335746.0 QSO 01 01 53.0283816757 +33 57 46.028244550           ~ 3 0
11 SDSS J014005.39-010333.3 QSO 01 40 05.4003273936 -01 03 33.361784633           ~ 6 0
12 SDSS J014858.31+141235.4 QSO 01 48 58.3091040279 +14 12 35.401183023           ~ 7 0
13 SDSS J015445.22+193515.8 QSO 01 54 45.2207756985 +19 35 15.905470906           ~ 9 0
14 SDSS J022759.78+000947.4 QSO 02 27 59.792 +00 09 47.46           ~ 9 0
15 SDSS J023011.29-033450.0 QSO 02 30 11.3074669455 -03 34 49.983767339           ~ 8 0
16 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
17 SDSS J072059.38+391955.9 QSO 07 20 59.3921009261 +39 19 55.983396582           ~ 6 0
18 SDSS J074344.26+142134.9 QSO 07 43 44.2619363623 +14 21 34.942296145           ~ 8 0
19 SDSS J074700.25+345301.6 QSO 07 47 00.2588499925 +34 53 01.614675968           ~ 5 0
20 [VV2006] J074815.5+225838 QSO 07 48 15.5483360790 +22 58 38.062066610   20.94 20.38     ~ 22 0
21 SDSS J075330.07+252000.8 QSO 07 53 30.0683459142 +25 20 00.890596873           ~ 6 0
22 SDSS J081206.74+105738.8 QSO 08 12 06.7377652314 +10 57 38.818609507           ~ 4 0
23 SDSS J081634.38+144612.4 QSO 08 16 34.3910998278 +14 46 12.475883677   21.91 20.39     ~ 33 0
24 SDSS J082532.45+424033.1 QSO 08 25 32.4590074906 +42 40 33.053448292           ~ 4 0
25 SDSS J084312.71+022117.3 QSO 08 43 12.7184895622 +02 21 17.320720942           ~ 13 0
26 [VV2006] J084533.1-000920 QSO 08 45 33.0500464146 -00 09 19.844521047   20.30 19.95     ~ 22 0
27 SDSS J084646.06+211257.3 QSO 08 46 46.0607241958 +21 12 57.396143831   22.26 21.29     ~ 8 0
28 SDSS J085201.02+050659.2 QSO 08 52 01.0242093427 +05 06 59.232151249           ~ 9 0
29 SDSS J090203.10+222732.1 QSO 09 02 03.1056353698 +22 27 32.249279579   20.30 19.89     ~ 11 0
30 SDSS J090227.15+411753.7 QSO 09 02 27.1540158701 +41 17 53.758948610           ~ 4 0
31 SDSS J091334.76+164506.2 QSO 09 13 34.7640278684 +16 45 06.328453620   20.83 20.48     ~ 8 0
32 SDSS J092233.40+395518.5 QSO 09 22 33.4053417045 +39 55 18.523026099           ~ 4 0
33 SDSS J092515.06+071354.1 QSO 09 25 15.064 +07 13 54.11           ~ 4 0
34 SDSS J093033.35+202311.7 QSO 09 30 33.3592922652 +20 23 11.746533415           ~ 5 0
35 SDSS J093653.81+040600.9 QSO 09 36 53.8210878535 +04 06 00.886034612           ~ 5 0
36 SDSS J094849.87+272435.0 QSO 09 48 49.8722512403 +27 24 35.015132352   21.19 20.83     ~ 7 0
37 [VV2006] J100645.6+462716 QSO 10 06 45.5955064686 +46 27 17.285559926   23.66 22.11     ~ 21 0
38 SDSS J102420.44+370321.7 QSO 10 24 20.4450072895 +37 03 21.829100354           ~ 6 0
39 SDSS J102657.73+222220.9 QSO 10 26 57.7396042389 +22 22 20.857301339           ~ 3 0
40 [VV2006] J103035.6+445033 QSO 10 30 35.6634577536 +44 50 33.371469018   20.55 20.12     ~ 21 0
41 SDSS J103049.12+262926.8 QSO 10 30 49.1318250757 +26 29 26.790462525   20.13 19.76     ~ 13 0
42 SDSS J103508.63+175306.0 QSO 10 35 08.638 +17 53 06.06           ~ 4 0
43 SDSS J103729.89+010711.5 QSO 10 37 29.8926512182 +01 07 11.712930043           ~ 4 0
44 SDSS J104054.60+250709.4 QSO 10 40 54.6095741576 +25 07 09.479272590   21.34 20.86     ~ 8 0
45 SDSS J104629.64-025114.5 QSO 10 46 29.6413924687 -02 51 14.559508589           ~ 6 0
46 SDSS J104803.87+184350.1 QSO 10 48 03.8800288835 +18 43 50.173298496           ~ 4 0
47 SDSS J111252.25+375910.2 QSO 11 12 52.2481737518 +37 59 10.270675053   21.65 20.62     ~ 17 0
48 SDSS J111743.20+124555.0 QSO 11 17 43.1997448247 +12 45 55.151065181           ~ 4 0
49 SDSS J112444.87+100235.5 QSO 11 24 44.877 +10 02 35.60           ~ 4 0
50 [VV2006] J113421.1+035200 QSO 11 34 21.0746076893 +03 52 00.917935491   22.31 21.00     ~ 20 0
51 MGC 22531 QSO 11 35 20.3948170427 -00 10 53.578794908   19.36       ~ 41 0
52 SDSS J113959.20+221930.9 QSO 11 39 59.209 +22 19 30.96           ~ 3 0
53 SDSS J114252.88+322619.5 QSO 11 42 52.881 +32 26 19.58           ~ 4 0
54 SDSS J114347.21+142021.6 QSO 11 43 47.2100430536 +14 20 21.580127425           ~ 5 0
55 SDSS J114638.95+074311.2 QSO 11 46 38.9525506689 +07 43 11.288132455           ~ 5 0
56 SDSS J120705.63+031637.1 QSO 12 07 05.636 +03 16 37.16           ~ 4 0
57 SDSS J120716.57+221117.4 QSO 12 07 16.5826554015 +22 11 17.433044619   22.31 21.34     ~ 8 0
58 SDSS J122923.90+373128.8 QSO 12 29 23.904 +37 31 28.89           ~ 4 0
59 SDSS J123248.44+070830.7 QSO 12 32 48.4483104030 +07 08 30.776942233           ~ 5 0
60 SDSS J123816.04+162042.5 QSO 12 38 16.0400380040 +16 20 42.514462303   21.71 20.71     ~ 13 0
61 SDSS J124817.37+010120.5 QSO 12 48 17.376 +01 01 20.52           ~ 4 0
62 QSO J1253-0228 QSO 12 53 36.3533107417 -02 28 07.746363785     18.80     ~ 33 0
63 SDSS J125855.40+121250.2 QSO 12 58 55.4093862248 +12 12 50.186427387   20.83 20.40     ~ 19 0
64 GRB 080607 gB 12 59 47.14 +15 55 09.6           ~ 209 0
65 SDSS J130150.97+460633.4 QSO 13 01 50.9780720569 +46 06 33.510422879           ~ 3 0
66 SDSS J130504.54+405713.8 QSO 13 05 04.5534067615 +40 57 13.769254697           ~ 6 0
67 SDSS J133707.41+305205.2 QSO 13 37 07.4004498810 +30 52 05.270272586           ~ 3 0
68 SDSS J134508.82+365214.8 QSO 13 45 08.8240253355 +36 52 14.836276576   20.56 20.28     ~ 11 0
69 SDSS J134910.45+044819.9 QSO 13 49 10.4510248980 +04 48 19.909693545           ~ 5 0
70 SDSS J135316.83+095636.7 QSO 13 53 16.8310204520 +09 56 36.726665762   21.11 20.23     ~ 15 0
71 SDSS J141120.50+122935.9 QSO 14 11 20.5093724507 +12 29 35.893208827           ~ 5 0
72 SDSS J143047.08+060201.0 QSO 14 30 47.0868199260 +06 02 00.986334352   22.76 21.52     ~ 15 0
73 [VV2006] J143107.5+342730 QSO 14 31 07.5176257991 +34 27 30.947838921   23.35 21.87 20.18 19.45 ~ 20 0
74 [VV2006] J143121.3+401543 QSO 14 31 21.3056103124 +40 15 43.998894699   21.34 20.86     ~ 18 0
75 SDSS J143703.74+315742.1 QSO 14 37 03.7358373999 +31 57 42.057631861   22.44 21.28     ~ 17 0
76 SDSS J143725.15+173444.3 QSO 14 37 25.1543237736 +17 34 44.346161292   21.37 20.66     ~ 9 0
77 SDSS J143746.91+501245.5 QSO 14 37 46.9146778384 +50 12 45.607573997           ~ 4 0
78 SDSS J144250.63+385414.8 QSO 14 42 50.6300972480 +38 54 14.793413974           ~ 4 0
79 SDSS J145258.79+252554.5 QSO 14 52 58.7974894734 +25 25 54.445581226   21.31 20.36     ~ 9 0
80 SDSS J145646.48+160939.3 QSO 14 56 46.4827746733 +16 09 39.378002911   20.89 20.04     ~ 15 0
81 [VV2006] J150731.9+435429 QSO 15 07 31.8815915506 +43 54 29.573777477   23.00 21.53     ~ 19 0
82 SDSS J151203.51+205547.6 QSO 15 12 03.5166833064 +20 55 47.694699481           ~ 5 0
83 [VV2006] J151349.5+035211 QSO 15 13 49.5189064999 +03 52 11.712454010   21.51 20.98     ~ 22 0
84 [VV2006] J153906.7+325007 QSO 15 39 06.6984018257 +32 50 07.594208030   22.52 21.28     ~ 18 0
85 SDSS J154235.24+360003.3 QSO 15 42 35.2404974171 +36 00 03.332009099           ~ 4 0
86 SDSS J155125.63+083545.7 QSO 15 51 25.638 +08 35 45.73           ~ 4 0
87 [VV2006] J155556.9+480015 QSO 15 55 56.8934722520 +48 00 15.112146199   20.31 19.67     ~ 30 0
88 SDSS J160311.34+212158.4 QSO 16 03 11.3417640897 +21 21 58.461524905   21.34 20.57     ~ 15 0
89 SDSS J161838.17+192110.5 QSO 16 18 38.1716680939 +19 21 10.442119114   22.35 21.35     ~ 12 0
90 SDSS J162629.25+274921.0 QSO 16 26 29.2530903825 +27 49 21.069477815           ~ 4 0
91 SDSS J162717.19+231931.9 QSO 16 27 17.1912188186 +23 19 32.029754522           ~ 6 0
92 SDSS J165426.78+320602.3 QSO 16 54 26.7879666668 +32 06 02.294120543           ~ 7 0
93 SDSS J165434.55+180751.4 QSO 16 54 34.5522657417 +18 07 51.421244388           ~ 6 0
94 SDSS J165645.23+300306.6 QSO 16 56 45.2396304080 +30 03 06.585895909           ~ 4 0
95 SDSS J171102.04+313507.6 QSO 17 11 02.0410934852 +31 35 07.572919021           ~ 7 0
96 SDSS J171200.17+262716.0 QSO 17 12 00.1797208020 +26 27 15.958112641           ~ 4 0
97 SDSS J214043.01-032139.2 QSO 21 40 43.0140120857 -03 21 39.259765833           ~ 13 0
98 SDSS J220525.56+102118.6 QSO 22 05 25.5667792205 +10 21 18.640368363           ~ 6 0
99 SDSS J220536.69+242242.3 QSO 22 05 36.695 +24 22 42.39           ~ 4 0
100 SDSS J221122.52+133451.2 QSO 22 11 22.5276460315 +13 34 51.303403356           ~ 7 0
101 SDSS J222338.81+070246.0 QSO 22 23 38.810 +07 02 46.04           ~ 3 0
102 SDSS J223250.97+124225.2 QSO 22 32 50.9795297865 +12 42 25.286766985           ~ 5 0
103 SDSS J224327.99+220312.5 QSO 22 43 27.9908149526 +22 03 12.555024965           ~ 3 0
104 [VV2006] J224621.1+132821 QSO 22 46 21.1363039644 +13 28 21.265703040   19.22 18.85     ~ 23 0
105 SDSS J231624.73+213237.5 QSO 23 16 24.7298019624 +21 32 37.576292506           ~ 3 0
106 SDSS J232207.30+003349.0 QSO 23 22 07.3062629830 +00 33 49.013831396           ~ 8 0
107 SDSS J233035.50+005842.3 QSO 23 30 35.5099323962 +00 58 42.319875462           ~ 7 0
108 SDSS J235854.43+014953.6 QSO 23 58 54.4277529348 +01 49 53.656839168           ~ 12 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:46:31

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