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Normal galaxies: X-ray luminosity function & its evolution

Normal galaxies: X-ray luminosity function & its evolution. Panayiotis Tzanavaris (NOA) Ioannis Georgantopoulos (NOA) Antonis Georgakakis (ICL). XSurverys06 Cambridge, MA. Nov 2006. XLF importance. Unique probe of X-ray binaries and hot gas in (non-AGN) normal galaxies

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Normal galaxies: X-ray luminosity function & its evolution

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  1. Normal galaxies: X-ray luminosity function & its evolution Panayiotis Tzanavaris (NOA) Ioannis Georgantopoulos (NOA) Antonis Georgakakis (ICL) XSurverys06 Cambridge, MA. Nov 2006

  2. XLF importance • Unique probe of X-ray binaries and hot gas in (non-AGN) normal galaxies • Disentangle NG evolution from AGN evolution XSurverys06 Cambridge, MA. Nov 2006

  3. X-ray surveys • E-CDF-S • CDF-N • CDF-S • XBOOTES XSurverys06 Cambridge, MA. Nov 2006

  4. Normal galaxies: selection criteria • Source detected in the 0.5-2.0 keV band • log ( fX [0.5-2.0 keV]/fR ) ≤ -1 (from filter) • log LX ≤ 42 (cgs) • HR ≡ (H-S)/(H+S) ≤ 0 • object morphologically a galaxy H ≡ 2.0-8.0 keV; S ≡ 0.5-2.0 keV XSurverys06 Cambridge, MA. Nov 2006

  5. E-CDF-S X-ray: Lehmer et al (2005) fX,lim[0.5-2.0keV]~1.1 × 10-16 erg cm-2 s-1 Optical: COMBO-17; Wolf et al (2004) ESO 2.2 m WFI 17 filters Rlim,Vega = 25.4 41 sources, z med = 0.264 XSurverys06 Cambridge, MA. Nov 2006

  6. CDF-N X-ray: 2 Ms, Alexander et al (2003) fX,lim[0.5-2.0 keV]~2.5 × 10-17 erg cm-2 s-1 Optical: Barger et al. (2003); Capak et al. (2004) KPNO 4 m (U), Subaru 8.3 m (rest) Rlim,AB = 26.6 79 sources, z med = 0.46 XSurverys06 Cambridge, MA. Nov 2006

  7. CDF-S X-ray: 1 Ms, Giacconi et al (2002) fX,lim[0.5-2.0 keV]~5.5 × 10-17 erg cm-2 s-1 Optical: Szokoly et al. (2004) VLT FORS spectra Zheng et al. (2004) z phot using 10 NUV, optical, NIR bands [ESO FORS, EIS, VLT, GOODS, COMBO-17] 56 sources, z med = 0.52 XSurverys06 Cambridge, MA. Nov 2006

  8. XBOOTES X-ray: Kenter et al (2005) fX,lim[0.5-2.0keV]~4.7 × 10-15 erg cm-2 s-1 Optical: SDSS DR5; Adelman-McCarthy et al (2007) 5 Sloan filters u’g’r’i’z’ r’lim,SDSS = 22.2 28 sources, z med = 0.128 XSurverys06 Cambridge, MA. Nov 2006

  9. Area curve XBOOTES dominates area XSurverys06 Cambridge, MA. Nov 2006

  10. LX - z • 204 sources to z ~ 1.3 • subsamples complementary XSurverys06 Cambridge, MA. Nov 2006

  11. Luminosity function • Page & Carrera (2000) • φ(L, z)  XSurverys06 Cambridge, MA. Nov 2006

  12. Luminosity function  0 < z < 0.2  0.2 < z < 0.6  0.6 < z < 1.3 Norman et al. (2004) z < 0.5 z > 0.5 Kim et al (2006) z < 0.3 Georgakakis et al. (2006) z < 0.2 no evolution L ~ (1+z)k k = 2.7 XSurverys06 Cambridge, MA. Nov 2006

  13. Luminosity function by type • Separate Early and Late-type systems • Hyperz • 61 template SEDs from smoothly interpolated (Sullivan et al 2004) four galaxy types • Filters for different surveys • E = 0 → 25 (105) • L = 25 → 60 (99) • Then binned XLF XSurverys06 Cambridge, MA. Nov 2006

  14. Luminosity function: Late types 0 < z < 0.4 0.4 < z < 1.3 • Georgakakis et al. (2006) no evolution, z < 0.2 L ~ (1+z)k k = 2.7 • Power laws? XSurverys06 Cambridge, MA. Nov 2006

  15. Luminosity function: Early types  0 < z < 0.4  0.4 < z < 1.3 • Georgakakis et al. (2006) no evolution, z < 0.2 L ~ (1+z)k k = 2.7 k = 2 • Power laws? XSurverys06 Cambridge, MA. Nov 2006

  16. Caveats… • ML fitting to be done • Functional form XSurverys06 Cambridge, MA. Nov 2006

  17. Summary • One of the largest NG samples with very broad coverage of L – z space • Reasonable agreement with previous work but evolution in E as well • More data: CDF 4 Ms XEUS (resolution?) XSurverys06 Cambridge, MA. Nov 2006

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