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

AuthorsCastelló-Mor, N. ; Barcons, Xavier ; Ballo, Lucía
KeywordsGalaxies: active
X-rays: redshift
X-rays: general
Issue DateOct-2011
CitationAdvances in Space Research 48(7): 1304-1310 (2011)
AbstractWe 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 (LX) versus redshift (z) plane the weak but ubiquitous Fe Ka narrow emission line can deliver an accurate redshift (dz < 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 1Ms will deliver 20%, 40% and 60% of the redshifts. This means that in a typical 18' - 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.
Description7 páginas, 4 figuras, 1 tabla.-- El pdf del artículo es la versión pre-print.
Publisher version (URL)http://dx.doi.org/10.1016/j.asr.2011.06.011
Appears in Collections:(IFCA) Artículos
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