November Megan E. Eckart Caltech with Fiona Harrison, David Helfand, Daniel Stern, Luke Kotredes The SEXSI Survey: Recent Progress

2 Overview Introduction to the SEXSI sample and optical followup Highlights of the optical/X-ray sample composition Spitzer data –high-z type 2 quasar candidates –SED’s of spectroscopically ID’d sources

3 SEXSI Survey Study dominant contributors to XRB keV sources from 27 Chandra pointings; (2 deg 2 ) R-band imaging 438 spectroscopic redshifts from Keck Harrison et al. 2003, ApJ, 596, (Paper 1)

4 SEXSI Survey

5 Redshift Distribution Peak: z ~ narrow-lined L x >10 44 sources (type-2 quasar candidates) nine z > 2, obscured type-2 quasar candidates Eckart et al. 2006, ApJS, 165, (Paper 3)

6 Fraction Obscured SEXSI - excellent statistics over flux range ~50% obscured independent of luminosity log (Unobscured 2-10 keV Luminosity [erg s -1 ]) Fraction with log(N H ) > 22 Eckart et al. 2006, ApJS, 165, (Paper 3)

7 Spitzer Data Spitzer data over five SEXSI fields (IRAC & MIPS) 250 SEXSI X-ray sources covered 140 with spectroscopic ID 62% of total X-ray sources are in “wedge” 86% of BLAGN 67% of NLAGN 28% of ELG 15% of sources with L x < erg s -1 - wedge from Stern et al. (2005)

8 High-z QSO 2 - quadrant split from Martinez-Sansigre, Lacy et al. (2005)

9 High-z QSO 2 - quadrant split from Martinez-Sansigre, Lacy et al. (2005)

10 BLAGN SED’s Many BLAGN fit a typical quasar SED (Elvis et al. 1994) BUT, there are many that fit a star forming template better in mid-IR/optical(Devriendt et al template plotted above) log ( [Hz])

11 NLAGN SED’s Fits star forming template in IR Bad match to both templates (would match an absorbed AGN spectrum …) log ( [Hz])

12 ELG SED’s Overwhelming majority (but not all) of ELG fit starforming template log ( [Hz])

13 In Progress… Synthesis of spectrally identified and unidentified SED’s X-ray stacking of Spitzer sources with Chandra nondetections Acknowledgements: Fiona Harrison, David Helfand, Dan Stern, Luke Kotredes

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