Column Density Extraction Tutorial Back to Tools
By: Harry White

The goal of this online tutorial is to train the user to analyze absorption troughs in AGN outflow spectra. The ultimate result will be the extraction of ionic column densities as well as determining inhomogeneous model parameters. The tutorial steps outline the details and complications of this process starting with simple single absorption troughs to fully synthesized spectra with absorption lines from several ions.

To begin the tutorial, click on the links below to access the individual tutorial steps.


Exercise 1: Lyman α Square Well Trough With Complete Coverage
Exercise 2: Lyman α Gaussian Trough With Complete Coverage
Exercise 3: Lyman α Sinusoidal Trough With Complete Coverage

Exercise 4: Carbon IV Doublet Square Well Troughs With Complete Coverage
Exercise 5: Carbon IV Doublet Square Well Troughs With Complete Coverage and Saturation
Exercise 6: Carbon IV Doublet Gaussian Troughs With Complete Coverage

Exercise 7: Partial Covering Conceptual Tutorial
Exercise 8: Carbon IV Doublet Square Well Troughs With Partial Coverage
Exercise 9: Carbon IV Doublet Gaussian Troughs With Partial Coverage
Exercise 10: Carbon IV Doublet Square Well Troughs With Velocity Dependent Parabolic Coverage
Exercise 11: Carbon IV Doublet Square Well Troughs With Velocity Dependent Gaussian Coverage
Exercise 12: Carbon IV Doublet Gaussian Troughs With Velocity Dependent Parabolic Coverage
Exercise 13: Carbon IV Doublet Gaussian Troughs With Velocity Dependent Gaussian Coverage

Exercise 14: Iron II Multiplet Gaussian Troughs With Full Coverage
Exercise 15: Iron II Multiplet Gaussian Troughs With Saturation and Full Coverage
Exercise 16: Iron II Multiplet Gaussian Troughs With Saturation and Partial Coverage

Exercise 17: Lyman α Square Well Trough With Complete Coverage (wavelength)
Exercise 18: Lyman α Gaussian Trough With Complete Coverage (wavelength)
Exercise 19: Carbon IV Doublet Square Well Troughs With Complete Coverage (wavelength)
Exercise 20: Carbon IV Doublet Gaussian Troughs With Complete Coverage (wavelength)
Exercise 21: Iron II Multiplet Gaussian Troughs With Full Coverage (wavelength)

Exercise 22: Multi-Ion Spectrum with Gaussian Troughs and Full Coverage
Exercise 23: Multi-Ion Spectrum with Gaussian Troughs and Partial Coverage
Exercise 24: Multi-Ion Spectrum with Gaussian Troughs and Partial Coverage (case 2)
Exercise 25: Multi-Ion Spectrum with Saturated Gaussian Troughs and Partial Coverage
Exercise 26: Multi-Ion Spectrum with Sinusoidal Troughs and Parabolic Coverage

Exercise 27: Power Law Covering Conceptual Tutorial
Exercise 28: Carbon IV Doublet Square Well Trough With constant a-Distribution
Exercise 29: Carbon IV Doublet Square Well Trough With Parabolic a-Distribution
Exercise 30: Carbon IV Doublet Linear Optical Depth With Constant a-Distribution
Exercise 31: Carbon IV Doublet Linear Optical Depth With Parabolic a-Distribution
Exercise 32: Carbon IV Doublet Square Well Trough With Inverted Parabolic a-Distribution
Exercise 33: Iron II Multiplet Sinusoidal Optical Depth With Constant a-Distribution
Exercise 34: Iron II Multiplet Sinusoidal Optical Depth With Linear a-Distribution
Exercise 35: Iron II Multiplet Sinusoidal Optical Depth With Parabolic a-Distribution
Exercise 36: Iron II Multiplet Sinusoidal Optical Depth With Parabolic a-Distribution
Exercise 37: Iron II Multiplet Sinusoidal Optical Depth With a-Distribution of 0

Exercise 38: Lyman α Square Well Trough With Broad Emission Spectrum
Exercise 39: Lyman α Gaussian Trough With Broad Emission Spectrum
Exercise 40: Carbon IV Square Well Trough With Broad and Narrow Emission Spectra
Exercise 41: Carbon IV Square Well Trough With Blended Emission Spectra
Exercise 42: Lyman α Gaussian Trough With Power Law Emission
Exercise 43: Carbon IV Square Well Trough With Blended Emission Spectra

Exercise 44: Lyman α Square Well Trough With Complete Coverage and Noise
Exercise 45: Lyman α Gaussian Trough With Complete Coverage and Noise
Exercise 46: Carbon IV Square Well Trough With Partial Coverage and Noise
Exercise 47: Carbon IV Square Well Trough With Gaussian Coverage and Noise
Exercise 48: Carbon IV Trough With Partial Coverage, Emission Spectra, and Noise


References

Arav, N., Kaastra, J., Kriss, G. A., Korista, K. T., Gabel, J. R., & Proga, D. 2005, ApJ, 620, 665
Arav, N., Kaastra, J., Steenbrugge, K., Brinkman, B., Edelson, R., Korista, T. K., & de Kool, M. 2003, ApJ, 590, 174
Arav, N., Brotherton, M. S., Becker, R. H., Gregg, M. D., White, R. L., Price, T., & Hack, W. 2001a, ApJ, 546, 140
de Kool, M., Arav, N., Becker, R. H., Laurent-Muehleisen, S. A., White, R. L., Price, T., & Gregg, M. D. 2001, ApJ, 548, 609
Gabel, J. R., et al. 2003, ApJ, 583, 178
Ganguly, R., Eracleous, M. C., Charlton, J. C., & Churchill, C. W. 1999, AJ, 117, 2594
Hamann, F., Barlow, T. A., Junkkarinen, V., & Burbidge, E. M. 1997, ApJ, 478, 80

Maintained by the Virginia Tech Quasar Outflow Group. Please cite responsibly.