The High Redshift (z>3) AGN Population In The 4 Ms Chandra Deep Field South PDF
Preview The High Redshift (z>3) AGN Population In The 4 Ms Chandra Deep Field South
TheHigh Redshift (z>3)AGN . PopulationIn The4Ms ChandraDeep The High Redshift (z > 3) AGN Population In FieldSouth The 4 Ms Chandra Deep Field South FabioVito ...... High-redshift AGNissues Sample Fabio Vito Selection Dipartimento di Astronomia - Universit(cid:18)a di Bologna Spectral analysisand INAF-OABO NH distribution and the CDF-S Team LogN-LogS Conclusions . . . . . . Outline TheHigh Redshift (z>3)AGN PopulationIn ChTahnedr4aMDesep 1... High-redshift AGN issues FieldSouth FabioVito ... 2 Sample Selection High-redshift AGNissues Sample ... Selection 3 Spectral analysis and NH distribution Spectral analysisand NH 4... LogN-LogS distribution LogN-LogS Conclusions 5... Conclusions . . . . . . High-redshift AGN issues TheHigh Redshift (z>3)AGN physical properties (obscuration) PopulationIn The4Ms ChandraDeep evolution (space density, obscured FieldSouth AGN fraction) FabioVito Observables: spectral properties, High-redshift number counts, etc. AGNissues Sample Need for large (high-redshift) Selection samples Spectral analysisand # NdiHstribution (X-ray) surveys LogN-LogS COSMOS (Brusa et al. 2009, Conclusions Civano et al. 2011) (Gillietal.,2011) 4 Ms CDF-S (Fiore et al. 2012, Lehmer et al. 2012) . . . . . . Catalogues TheHigh Redshift 740 X-ray sources in the 4 Ms CDF-S main catalogue (z>3)AGN PopulationIn (Xue et al. 2011) The4Ms ChandraDeep FieldSouth FabioVito Spectroscopic redshifts: High-redshift AGNissues Szokoly et al. (2004); Vanzella et al. (2008); Popesso et al. Sample (2009); Silverman et al. (2010); Wuyts et al. (2008); Vanzella Selection et al. (2010). Spectral analysisand NH distribution LogN-LogS Photometric redshifts: Conclusions Luo et al. (2010), Cardamone et al. (2010); Ra(cid:11)erty et al. (2011); Santini et al. (2009); Wuyts et al. (2008); Taylor et al. (2009); Dahlen et al. (2010). . . . . . . Selection criteria TheHigh Redshift 65 sources have zadopt > 3 in Xue et al. (2011) (z>3)AGN PopulationIn The4Ms 96 sources have z > 3 in at least 1 of the considered catalogues ChandraDeep FieldSouth FabioVito 1... \Secure" spectroscopic z > 3 (12 sources) High-redshift 2... \Insecure" spectroscopic z > 3, upgraded to \secure" AGNissues through visual inspection (3 sources) Sample Selection ... 3 When more than 2 phot-z are available, Sanpaelcytsriasland N (cid:0)N (cid:21) 3 (7 sources) NH zphot>3 zphot<3 distribution 4... When only 2 phot-z are available, both are at z > 3 LogN-LogS (8 sources) Conclusions ... 5 When only one phot-z is available, its 1(cid:27) lower limit is at z > 3 (4 sources) TOTAL: 34 SOURCES . . . . . . Redshift distribution TheHigh Following Xue et al. (2011), in order of preference: spec-z, Redshift (z>3)AGN phot-z from Luo et al. (2010), phot-z from Cardamone et al. PopulationIn The4Ms (2010), phot-z from Dahlen et al. (2010) ChandraDeep FieldSouth FabioVito High-redshift AGNissues Sample Selection Spectral analysisand NH distribution LogN-LogS Conclusions Median redshift: z = 3:7 . . . . . . 0:5 (cid:0) 7 keV Net-counts distribution TheHigh Redshift (z>3)AGN PopulationIn The4Ms ChandraDeep FieldSouth Low statistics FabioVito # simple spectral model High-redshift AGNissues # Sample Selection Absorbed power-law Spectral ((cid:0) = 1:8) analysisand # NH distribution Focus on the column LogN-LogS density Conclusions Median net counts: 80 . . . . . . N distribution H TheHigh Redshift (z>3)AGN PopulationIn ChTahnedr4aMDesep (cid:24) 67% strongly FieldSouth obscured FabioVito (N > 1023cm(cid:0)2) H High-redshift sources AGNissues Sample Possible bias due Selection to low statistics Spectral analysisand and high-z NH distribution (overestimate of LogN-LogS the column Conclusions density) . . . . . . N distribution H TheHigh Redshift (z>3)AGN PopulationIn The4Ms ChandraDeep FieldSouth FabioVito High-redshift AGNissues Sample Selection Spectral analysisand NH distribution LogN-LogS Conclusions Median L2(cid:0)10keV = 1:52(cid:2)1044erg s(cid:0)1 . . . . . . Correction factors for the N distribution H TheHigh Redshift (z>3)AGN PopulationIn The4Ms Problem: possible NH overestimation due to low statistics and ChandraDeep FieldSouth high-z # FabioVito How many times a X-ray spectrum intrinsically absorbed by a High-redshift AGNissues column density N is best-(cid:12)tted by Hj Sample a di(cid:11)erent column density N ? Selection Hi # Spectral analysisand Spectral simulations! NH distribution # LogN-LogS Correction factors P ij Conclusions (probability to derive N given an intrinsic N ) Hi Hj . . . . . .
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