Mathematics – Logic
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011adspr..48.1304c&link_type=abstract
Advances in Space Research, Volume 48, Issue 7, p. 1304-1310.
Mathematics
Logic
Scientific paper
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 α narrow emission line can deliver an accurate redshift ( δz < 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′ × 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.
Ballo Lucia
Barcons Xavier
Castelló-Mor N.
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