Using PCA to Determine Metal-line, HI Column Density Correlations in QSO Absorbers

Details Using PCA to Determine Metal-line, HI Column Density Correlations in QSO Absorbers Using PCA to Determine Metal-line, HI Column Density Correlations in QSO Absorbers

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20712006h&link_type=abstract

American Astronomical Society Meeting 207, #120.06; Bulletin of the American Astronomical Society, Vol. 37, p.1361

Astronomy and Astrophysics

Astronomy

Scientific paper

Since QSO damped Lyman alpha systems (DLAs) are rare and UV spectroscopy is required to detect Lyα at z<1.65, it is desirable to have new methods to quantify the neutral gas content of the low-redshift universe. We are exploring the MgII selection method of Rao et al. (2005) by considering additional absorption-line system properties. We compare the relative success of different approaches to identifying DLA systems using Principal Components Analysis (PCA), multiple regression, and cuts in parameter space.

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