X-ray redshifts with the International X-ray Observatory (IXO)

被引：1
|
作者：
Castello-Mor, N. [1 ]
Barcons, X. [1 ]
Ballo, L. [1 ]
机构：
[1] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain
来源：
ADVANCES IN SPACE RESEARCH | 2011年 / 48卷 / 07期
关键词：
Galaxies: active; X-rays: redshift; X-rays: general; IXO; K-ALPHA LINE; LUMINOSITY FUNCTION; BLACK-HOLE; AGN; EVOLUTION; GALAXIES; EMISSION; CHANDRA; SPECTRA; HISTORY;
D O I：
10.1016/j.asr.2011.06.011
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
We explore the capabilities of the future space science mission IXO (International X-ray Observatory) for obtaining cosmological redshifts of distant Active Galactic Nuclei (AGNs) using the X-ray data only. We first find in which regions of the X-ray luminosity (L-X) versus redshift (z) plane the weak but ubiquitous Fe K alpha narrow emission line can deliver an accurate redshift (delta(Z) < 5%) as a function of exposure time, using a CCD-based Wide Field Imager (IXO/WFI) as the one baselined for IXO. Down to a 2-10 keV X-ray flux of 10(-14) erg cm(-2) s(-1) IXO/WFI exposures of 100 ks, 300 ks and 1 Ms will deliver 20%, 40% and 60% of the redshifts. This means that in a typical 18' x 18' IXO/WFI field of view, 4, 10 and 25 redshifts will be obtained for free from the X-ray data alone, spanning a wide range up to z 2-3 and fairly sampling the real distribution. Measuring redshifts of fainter sources will indeed need spectroscopy at other wavebands. (C) 2011 COSPAR. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1304 / 1310
页数：7
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