2013ApJ...779...24V


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET21:58:55

2013ApJ...779...24V - Astrophys. J., 779, 24 (2013/December-2)

Discovery of three z > 6.5 quasars in the VISTA kilo-degree infrared galaxy (VIKING) survey.

VENEMANS B.P., FINDLAY J.R., SUTHERLAND W.J., DE ROSA G., McMAHON R.G., SIMCOE R., GONZALEZ-SOLARES E.A., KUIJKEN K. and LEWIS J.R.

Abstract (from CDS):

Studying quasars at the highest redshifts can constrain models of galaxy and black hole formation, and it also probes the intergalactic medium in the early universe. Optical surveys have to date discovered more than 60 quasars up to z ≃ 6.4, a limit set by the use of the z-band and CCD detectors. Only one z ≳ 6.4 quasar has been discovered, namely the z = 7.08 quasar ULAS J1120+0641, using near-infrared imaging. Here we report the discovery of three new z ≳ 6.4 quasars in 332 deg2 of the Visible and Infrared Survey Telescope for Astronomy Kilo-degree Infrared Galaxy (VIKING) survey, thus extending the number from 1 to 4. The newly discovered quasars have redshifts of z = 6.60, 6.75, and 6.89. The absolute magnitudes are between -26.0 and -25.5, 0.6-1.1 mag fainter than ULAS J1120+0641. Near-infrared spectroscopy revealed the Mg II emission line in all three objects. The quasars are powered by black holes with masses of ~(1-2)x109 M. In our probed redshift range of 6.44 < z < 7.44 we can set a lower limit on the space density of supermassive black holes of ρ(MBH> 109 M) > 1.1x10–9 M/pc3. The discovery of three quasars in our survey area is consistent with the z = 6 quasar luminosity function when extrapolated to z ∼ 7. We do not find evidence for a steeper decline in the space density of quasars with increasing redshift from z = 6 to z = 7.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: active - quasars: general - quasars: individual (VIKING J234833.34-305410.0, VIKING J010953.13-304726.3, VIKING J030516.92-315056.0)

Simbad objects: 14

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 517 0
2 QSO J0109-3047 QSO 01 09 53.13 -30 47 26.3           ~ 25 0
3 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 120 0
4 QSO J0305-3150 QSO 03 05 16.92 -31 50 56.0           ~ 34 0
5 QSO J1120+0641 QSO 11 20 01.48 +06 41 24.3           ~ 177 0
6 VIKING J115439.84+014153.3 NIR 11 54 39.84 +01 41 53.3           ~ 1 0
7 VIKING J115642.26-000758.1 NIR 11 56 42.26 -00 07 58.1           ~ 1 0
8 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1038 0
9 LP 916-15 PM* 15 38 59.6477173130 -28 35 36.970418054   12.19 11.62     A 104 0
10 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 221 0
11 VIKING J221857.36-315430.0 NIR 22 18 57.36 -31 54 30.0           ~ 1 0
12 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 104 0
13 Feige 110 HS* 23 19 58.3995050606 -05 09 56.170282845 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 560 1
14 QSO J2348-3054 QSO 23 48 33.34 -30 54 10.0           ~ 23 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2013ApJ...779...24V and select 'bookmark this link' or equivalent in the popup menu


2020.10.29-21:58:55

© Université de Strasbourg/CNRS

    • Contact