2006MNRAS.367..412R

Query : 2006MNRAS.367..412R

2006MNRAS.367..412R - Mon. Not. R. Astron. Soc., 367, 412-422 (2006/March-3)

An excess of damped Lyman α galaxies near quasi-stellar objects.

RUSSELL D.M., ELLISON S.L. and BENN C.R.

Abstract (from CDS):

We present a sample of 33 damped Lyman α systems (DLAs) discovered in the Sloan Digital Sky Survey (SDSS) whose absorption redshifts (zabs) are within 6000 km/s of the quasi-stellar object's (QSO) systemic redshift (zsys). Our sample is based on 731 2.5 < zsys< 4.5 non-broad absorption line (non-BAL) QSOs from Data Release 3 (DR3) of the SDSS. We estimate that our search is ~100 per cent complete for absorbers with N(Hi) ≥ 2x1020/cm2. The derived number density of DLAs per unit redshift, n(z), within Δv < 6000km/s is higher (3.5σ significance) by almost a factor of 2 than that of intervening absorbers observed in the SDSS DR3, i.e. there is evidence for an overdensity of galaxies near the QSOs. This provides a physical motivation for excluding DLAs at small velocity separations in surveys of intervening `field' DLAs. In addition, we find that the overdensity of proximate DLAs is independent of the radio-loudness of the QSO, consistent with the environments of radio-loud and radio-quiet QSOs being similar.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): quasars: emission lines - quasars: general - early Universe - radio continuum: galaxies

Simbad objects: 33

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Number of rows : 33
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 QSO J0140-0839 QSO 01 40 49.1830961952 -08 39 42.462483840   19.62 18.57     ~ 57 0
2 [VV2006] J073938.8+305951 QSO 07 39 38.8483139856 +30 59 51.306796824   21.64 21.00     ~ 26 0
3 [VV2006] J080553.0+302937 QSO 08 05 53.0274086208 +30 29 37.363969500   21.15 20.53     ~ 27 0
4 [VV2006] J081114.3+393633 QSO 08 11 14.3269746288 +39 36 33.260028948   20.90 20.42     ~ 29 0
5 QSO J0826+5152 QSO 08 26 38.5922472096 +51 52 33.220318512   17.78 17.45     ~ 30 0
6 [VV2006] J084451.7+051827 QSO 08 44 51.7221455304 +05 18 27.758970684   23.73 21.92     ~ 25 0
7 [VV2006] J090930.4+070051 QSO 09 09 30.4205402832 +07 00 50.820190740   20.88 20.50     ~ 27 0
8 [VV2006] J094035.9+500308 QSO 09 40 35.9402589432 +50 03 08.683399152   21.65 20.89     ~ 23 0
9 [VV2006] J101122.6+470042 Bla 10 11 22.5956102616 +47 00 42.180620220   19.74 19.37 18.8   ~ 41 1
10 QSO J1026+6136 QSO 10 26 19.0962297072 +61 36 28.912047444   20.36 19.40     ~ 34 0
11 [VV2006] J104501.4+504045 QSO 10 45 01.4446427712 +50 40 45.924394476   21.98 20.85     ~ 24 0
12 [VV2006] J104820.9+503254 QSO 10 48 20.9327505288 +50 32 54.194311644   21.99 20.99     ~ 24 0
13 [VV2006] J111224.2+004630 QSO 11 12 24.1832428680 +00 46 30.430665444   21.78 20.59     ~ 31 0
14 [VV2006] J112648.6+055627 QSO 11 26 48.6223902984 +05 56 28.130171568   20.31 19.88     ~ 27 0
15 [VV2006] J122723.6+014805 QSO 12 27 23.6525064960 +01 48 05.978640312   21.36 20.81     ~ 24 0
16 [VV2006] J124204.3+625711 QSO 12 42 04.2715634328 +62 57 12.072394728   20.89 20.28     ~ 28 0
17 [VV2006] J124830.6+491400 QSO 12 48 30.6482902656 +49 14 00.247996680   21.00 20.61     ~ 25 0
18 QSO J1257-0111 QSO 12 57 59.2191767280 -01 11 30.304749804   20.90 19.82     ~ 43 0
19 [VV2006] J132521.3+524512 QSO 13 25 21.2775192480 +52 45 12.992822172   21.75 20.70     ~ 28 0
20 [VV2006] J134100.1+580723 QSO 13 41 00.1408148808 +58 07 24.149533656   20.59 19.96     ~ 29 0
21 [VV2006] J134638.0+564915 QSO 13 46 37.9391119584 +56 49 15.632804460   20.86 20.17     ~ 25 0
22 [VV2006] J140029.0+411243 QSO 14 00 29.0121364224 +41 12 43.505138592   19.57 19.21     ~ 26 0
23 [VV2006] J142041.9+422257 QSO 14 20 41.9699447424 +42 22 57.136047744   20.75 20.12     ~ 24 0
24 [VV2006] J145120.6+391350 QSO 14 51 20.6546138640 +39 13 50.523093912   21.43 20.88     ~ 24 0
25 [VV2006] J151254.4-005636 QSO 15 12 54.3723995592 -00 56 36.554343612   23.82 22.26     ~ 23 0
26 [VV2006] J155248.0+560328 QSO 15 52 48.0249895320 +56 03 28.905542100   21.30 20.62     ~ 30 0
27 [VV2006] J160813.9+374727 QSO 16 08 13.8569314656 +37 47 27.342004452   22.04 21.04     ~ 24 0
28 [VV2006] J161119.6+441144 QSO 16 11 19.5751270464 +44 11 44.082640428   22.22 21.09     ~ 31 0
29 [VV2006] J170421.8+624741 QSO 17 04 21.8644395600 +62 47 41.667224388   20.99 20.66     ~ 22 0
30 [VV2006] J171800.2+621325 QSO 17 18 00.1954390272 +62 13 25.722597324   21.28 20.44     ~ 24 0
31 [VV2006] J172007.2+602823 QSO 17 20 07.1839970208 +60 28 24.011816808   23.80 22.02     ~ 31 0
32 QSO J2100-0641 QSO 21 00 25.0301694552 -06 41 45.968177220   19.02 18.54     ~ 60 0
33 QSO J2122-0014 QSO 21 22 07.3615009656 -00 14 45.585196728   21.76 20.43     ~ 41 0

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