The Accretion Disk Temperature Continuum Color Relation in Quasars

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The Accretion Disk Temperature - Continuum Color
Relation in Quasars

• Erin Wells Bonning (Obs. Paris - Meudon)
• Gregory A. Shields, Sarah Salviander, Linpeng
  Cheng (UT - Austin)

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Introduction

• Naïve expectation from freshman physics hotter
  blackbody is bluer in color
• AGNSPEC models (I. Hubeny and collaborators)
• Non-LTE disk atmosphere.
• Input range of MBH, accretion rates, random disk
  inclinations.
• Total integrated spectrum with full relativistic
  effects.

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SDSS DR3 Observations

• Temperature of disk at radius of maximum flux
• (Kerr BH)
• Tmax 105.56 ? M8-1/4 ? (L/Led)1/4
• MBH 107.69 Msun ? (FWHM3000 km/s)2 ? L440.5
• Tmax depends inversely on FWHM of broad line.
• Bin objects by Tmax and sum average flux ratios
  between 5100, 4000, and 2200 Å.
• Sub-sample of 2,000 objects distributed among
  Tmax with well-measured broad line widths.

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Questions

• What effect does galaxy contribution have?
• 2200 Å dust, NLS1, high Eddington ratio?
• What happens at higher redshift - can we use CIV
  and L1350 to get a broader range in flux ratio?
• Better understanding of accretion disk physics in
  AGN

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