期刊
ASTROPHYSICAL JOURNAL
卷 713, 期 1, 页码 558-572出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/713/1/558
关键词
galaxies: active; large-scale structure of universe; X-rays: galaxies
资金
- NASA [NNX07AT02G]
- CONACyT [83564]
- UNAM-DGAPA [IN110209]
- Bundesministerium fur Bildung und Forschung (BMBF/DLR)
- MaxPlanck-Gesellschaft (MPG)
- Alfred P. Sloan Foundation
- University of Chicago, Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck Institute for Astrophysics (MPA)
- New Mexico State University, University of Pittsburgh, Princeton University
- United States Naval Observatory
- University of Washington
- National Aeronautics and Space Administration
- National Science Foundation
- U.S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
We investigate the clustering properties of similar to 1550 broad-line active galactic nuclei (AGNs) at < z > = 0.25 detected in the ROSAT All-Sky Survey (RASS) through their measured cross-correlation function with similar to 46,000 luminous red galaxies (LRGs) in the Sloan Digital Sky Survey. By measuring the cross-correlation of our AGN sample with a larger tracer set of LRGs, we both minimize shot noise errors due to the relatively small AGN sample size and avoid systematic errors due to the spatially varying Galactic absorption that would affect direct measurements of the auto-correlation function (ACF) of the AGN sample. The measured ACF correlation length for the total RASS-AGN sample (< L-X(0.1-2.4 keV)> = 1.5 x 10(44) erg s(-1)) is r(0) = 4.3(-0.5)(+0.4) h(-1) Mpc and the slope gamma = 1.7(-0.1)(+0.1). Splitting the sample into low and high L-X samples at L-X(0.5-10 keV) = 10(44) erg s(-1), we detect an X-ray luminosity dependence of the clustering amplitude at the similar to 2.5 sigma level. The low L-X sample has r(0) = 3.3(-0.8)(+0.6) h(-1) Mpc (gamma = 1.7(-0.3)(+0.4)), which is similar to the correlation length of blue star-forming galaxies at low redshift. The high L-X sample has r(0) = 5.4(-1.0)(+0.7) h(-1) Mpc (gamma = 1.9(-0.2)(+0.2)), which is consistent with the clustering of red galaxies. From the observed clustering amplitude, we infer that the typical dark matter halo (DMH) mass harboring RASS-AGN with broad optical emission lines is log (M-DMH/(h(-1) M-circle dot)) = 12.6(-0.3)(+0.2), 11.8(-infinity)(+0.6), 13.1(-0.4)(+0.2) for the total, low L-X, and high L-X RASS-AGN samples, respectively.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据