2015ApJ...809..138I


Query : 2015ApJ...809..138I

2015ApJ...809..138I - Astrophys. J., 809, 138 (2015/August-3)

The quasar-LBG two-point angular cross-correlation function at z∼4 in the COSMOS field.

IKEDA H., NAGAO T., TANIGUCHI Y., MATSUOKA K., KAJISAWA M., AKIYAMA M., MIYAJI T., KASHIKAWA N., MOROKUMA T., SHIOYA Y., ENOKI M., CAPAK P., KOEKEMOER A.M., MASTERS D., SALVATO M., SANDERS D.B., SCHINNERER E. and SCOVILLE N.Z.

Abstract (from CDS):

In order to investigate the origin of quasars, we estimate the bias factor for low-luminosity quasars at high redshift for the first time. In this study, we use the two-point angular cross-correlation function (CCF) for both low-luminosity quasars at and Lyman-break galaxies (LBGs). Our sample consists of both 25 low-luminosity quasars (16 objects are spectroscopically confirmed low-luminosity quasars) in the redshift range and 835 color-selected LBGs with at z ∼ 4 in the COSMOS field. We have performed our analysis for the following two quasar samples: (1) the spectroscopic sample (the 16 quasars confirmed by spectroscopy), and (2) the total sample (the 25 quasars including 9 quasars with photometric redshifts). The bias factor for low-luminosity quasars at z ∼ 4 is derived by utilizing the quasar-LBG CCF and the LBG auto-correlation function. We then obtain the 86% upper limits of the bias factors for low-luminosity quasars, which are 5.63 and 10.50 for the total and the spectroscopic samples, respectively. These bias factors correspond to the typical dark matter halo masses, log 12.7 and 13.5, respectively. This result is not inconsistent with the predicted bias for quasars that is estimated by the major merger models.

Abstract Copyright:

Journal keyword(s): galaxies: active - large-scale structure of universe - quasars: general

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 772 0
2 ACS-GC 20078484 AGN 09 57 59.01 +01 58 04.9   23.678 22.763   23.207 ~ 13 0
3 ACS-GC 20104621 AGN 09 58 01.43 +02 11 07.2   24.0323 22.732   22.209 ~ 14 0
4 SDSS J095839.86+024424.7 G 09 58 39.86448 +02 44 24.7668   23.491 22.661     ~ 2 0
5 ACS-GC 20024183 AG? 09 58 48.36 +01 38 18.1   24.028 22.481   22.528 ~ 5 0
6 ACS-GC 20099567 QSO 09 58 56.70 +02 10 47.7   28.017 25.2149   23.885 ~ 31 0
7 ACS-GC 20183048 QSO 09 59 01.29 +02 44 18.8 27.71 25.04 23.02 23.21 22.97 ~ 28 0
8 COSMOS 2042408 QSO 09 59 06.46 +02 26 39.5   25.3193 23.9803   22.848 ~ 25 0
9 COSMOS2015 895446 AGN 09 59 22.37 +02 39 32.8   25.28 23.6983 23.31 22.94 ~ 10 0
10 ACS-GC 20096726 AGN 09 59 24.37 +02 16 35.0   24.2981 22.9219   23.271 ~ 25 0
11 COSMOS2015 306758 AGN 09 59 24.95 +01 45 13.2 24.80 23.5176 22.7363 22.78 22.62 ~ 8 0
12 ACS-GC 20127353 QSO 09 59 28.726 +02 17 38.36   23.977 22.727   22.02 ~ 36 0
13 COSMOS2015 486220 QSO 10 00 01.058 +02 02 19.96   23.2001 21.8854   21.78 ~ 35 0
14 COSMOS2015 310572 AGN 10 00 25.77 +01 45 33.2   25.47 23.66 22.96 22.65 ~ 20 0
15 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3012 0
16 CANDELS COSMOS F160W J100031.28+022757.4 AGN 10 00 31.29 +02 27 57.6   24.7358 23.5808     ~ 5 0
17 COSMOS2015 319931 G 10 00 40.54 +01 46 28.5 27.47 26.051 24.44 23.80 23.17 ~ 5 0
18 [ICS2009] 1657280 QSO 10 00 57.792 +02 39 32.48   23.569 22.688   22.49 ~ 29 0
19 COSMOS2015 436465 G 10 01 06.52 +01 57 30.1   24.789 23.709     ~ 5 0
20 COSMOS2015 241721 AGN 10 01 44.90 +01 38 57.5   25.456 24.014     ~ 4 0
21 COSMOS2015 382203 AGN 10 01 56.55 +01 52 18.9   28.577 23.1988   22.1 ~ 9 0
22 COSMOS2015 869382 AGN 10 02 22.04 +02 37 09.7 24.98 23.89 22.988 23.03 22.85 ~ 8 0
23 ACS-GC 20166404 QSO 10 02 28.817 +02 40 16.90   23.884 22.786   22.27 ~ 30 0
24 COSMOS2015 465432 G 10 02 30.79 +02 00 22.3   25.03 23.66 23.48 23.44 ~ 5 0
25 COSMOS2015 720289 QSO 10 02 33.23 +02 23 28.9   23.9799 22.404     ~ 17 0
26 COSMOS 1864254 QSO 10 02 48.90 +02 22 12.1   24.6232 22.8512   22.519 ~ 26 0
27 COSMOS 2534376 QSO 10 02 56.924 +02 43 21.19   24.126 22.950   22.32 ~ 26 0
28 NAME Extended Groth Strip reg 14 19 +52.8           ~ 838 0

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