We investigate the presence of iron line emission among faint X-ray sources identified in the 1 Ms Chandra Deep Field-South and in the 2 Ms Chandra Deep Field-North. Individual source spectra are stacked in seven redshift bins over the range z=0.5-4. We find that iron line emission is a ubiquitous property of X-ray sources up to z~=3. The measured line strengths are in good agreement with those expected by simple pre-Chandra estimates based on X-ray background synthesis models. The average rest-frame equivalent width of the iron line does not show significant changes with redshift.
The Iron Line background / Brusa M.; Gilli R.; Comastri A.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - STAMPA. - 621:(2005), pp. 5-8.
The Iron Line background
BRUSA, MARCELLA;
2005
Abstract
We investigate the presence of iron line emission among faint X-ray sources identified in the 1 Ms Chandra Deep Field-South and in the 2 Ms Chandra Deep Field-North. Individual source spectra are stacked in seven redshift bins over the range z=0.5-4. We find that iron line emission is a ubiquitous property of X-ray sources up to z~=3. The measured line strengths are in good agreement with those expected by simple pre-Chandra estimates based on X-ray background synthesis models. The average rest-frame equivalent width of the iron line does not show significant changes with redshift.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
