2006MNRAS.370.1479M

Query : 2006MNRAS.370.1479M

2006MNRAS.370.1479M - Mon. Not. R. Astron. Soc., 370, 1479-1498 (2006/August-2)

A population of high-redshift type 2 quasars - I. Selection criteria and optical spectra.

MARTINEZ-SANSIGRE A., RAWLINGS S., LACY M., FADDA D., JARVIS M.J., MARLEAU F.R., SIMPSON C. and WILLOTT C.J.

Abstract (from CDS):

We discuss the relative merits of mid-infrared and X-ray selection of type 2 quasars. We describe the mid-infrared, near-infrared and radio selection criteria used to find a population of redshift z ∼ 2 type 2 quasars which we previously argued suggests that most supermassive black hole growth in the Universe is obscured. We present the optical spectra obtained from the William Herschel Telescope, and we compare the narrow emission-line luminosity, radio luminosity and maximum size of jets to those of objects from radio-selected samples. This analysis suggests that these are genuine radio-quiet type 2 quasars, albeit the radio-bright end of this population. We also discuss the possibility of two different types of quasar obscuration, which could explain how the ∼2-3:1 ratio of type 2 to type 1 quasars preferred by modelling our population can be reconciled with the ∼1:1 ratio predicted by unified schemes.

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

Journal keyword(s): galaxies: active - galaxies: nuclei - quasars: general

CDS comments: In Chap. 7: the four individual high-redshift types 2s from the literature are respectively : CXOU J084837.9+445352, [ABB2003] CDFS 125, QSO J0945-2428 and [ABB2003] CDFS 188.

Simbad objects: 36

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Number of rows : 36
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 CXOCDFS J033218.9-275136 Sy2 03 32 18.8321 -27 51 35.476   25.15   24.51 25.128 ~ 83 0
3 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
4 [VV2006] J033229.9-275106 Sy2 03 32 29.8487 -27 51 05.879   27.5675 25.05 23.970 24.5370 ~ 101 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 [STS2002] 52 AGN 08 48 38.0 +44 53 53       24.220   ~ 32 0
7 QSO J0945-2428 Sy2 09 45 31.8 -24 28 31   23.0 22.9     ~ 5 1
8 QSO J1004+1229 QSO 10 04 24.8871 +12 29 22.245   24.83 23.23 20.80   ~ 53 1
9 [VV96] J102434.5+470911 Sy1 10 24 34.5 +47 09 11     20.5     ~ 489 0
10 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
11 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1
12 NAME Subaru Deep Field NGP reg 13 24 21.3 +27 29 23           ~ 330 1
13 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
14 [MGC2004] J171311.078+595552.13 QSO 17 13 11.158 +59 55 51.53           ~ 9 0
15 AMS 2 QSO 17 13 15.9 +60 02 34           ~ 18 0
16 AMS 3 Sy1 17 13 40.193 +59 27 45.96           ~ 11 1
17 AMS 4 Sy1 17 13 40.481 +59 49 16.89       22.84   ~ 12 0
18 AMS 5 Sy1 17 13 42.7125 +59 39 20.323       24.90   ~ 18 1
19 AMS 6 Sy1 17 13 43.9 +59 57 15           ~ 20 0
20 [MGC2004] J171402.218+594829.22 QSO 17 14 02.243 +59 48 28.75           ~ 8 0
21 AMS 8 QSO 17 14 29.63016 +59 32 33.6516           ~ 14 0
22 AMS 9 Sy2 17 14 35.6379701904 +58 56 52.447436880           ~ 11 0
23 [MGC2004] J171620.080+594026.88 QSO 17 16 19.9980 +59 40 26.840           ~ 10 0
24 AMS 11 QSO 17 18 21.3 +59 40 27           ~ 12 0
25 AMS 12 Sy1 17 18 22.6 +59 01 55           ~ 17 0
26 SDSS J171844.39+592000.8 Sy1 17 18 44.380 +59 20 00.73       22.48   ~ 27 0
27 AMS 14 Sy1 17 18 45.5 +58 51 22       23.33   ~ 14 0
28 AMS 15 QSO 17 18 56.9 +59 03 24           ~ 10 0
29 AMS 16 QSO 17 19 42.1 +58 47 09           ~ 10 0
30 [YSF2007] MIPS 22558 QSO 17 20 45.17 +58 52 21.4       23.90   ~ 21 0
31 AMS 18 Sy1 17 20 46.3 +60 02 30           ~ 12 0
32 AMS 19 Sy1 17 20 48.0 +59 43 21           ~ 17 0
33 AMS 20 QSO 17 20 59.1190 +59 17 50.940           ~ 8 0
34 AMS 21 QSO 17 21 20.1 +59 03 48           ~ 11 0
35 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
36 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0

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