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| ID:
720193.0,
MPI für Astronomie / Publikationen_mpia |
| The quasar-LBG two-point angular cross-correlation function at z~4 in the COSMOS field |
| Authors: | 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.; Scoville, N. Z. | | Date of Publication (YYYY-MM-DD): | 2015 | | Title of Journal: | The Astrophysical Journal | | Volume: | 809 | | Issue / Number: | 2 | | Start Page: | id. 138 (14 pp) | | Audience: | Not Specified | | Abstract / Description: | 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 -24\lt {M}1450\lt -22 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 3.1\lt z\lt 4.5 and 835 color-selected LBGs with {z}{LBG}\prime \lt 25.0 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 ({M}{DM}/({h}-1{M}ȯ )) = 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. | | Free Keywords: | galaxies: active; large-scale structure of universe; quasars: general | | External Publication Status: | published | | Document Type: | Article |
| Communicated by: | N. N. | | Affiliations: | MPI für Astronomie | | Identifiers: | ISSN:0004-637X
URL:http://cdsads.u-strasbg.fr/abs/2015ApJ...809..138I
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