Parameterisation of Galaxy Spectra in the 2dF Galaxy Redshift Survey

Details Parameterisation of Galaxy Spectra in the 2dF Galaxy Redshift Survey Parameterisation of Galaxy Spectra in the 2dF Galaxy Redshift Survey

2000-10-16

arxiv.org/abs/astro-ph/0010307v1

Astronomy and Astrophysics

Astrophysics

Latex, 6 pages, 3 figures, To appear in Springer-Verlag series "ESO Astrophysics Symposia"

Scientific paper

10.1007/10849171_39

The 2dF Galaxy Redshift Survey has already yielded over 130,000 galaxy spectra (out of the planned 250,000). We present a method for the parameterisation of galaxy spectra in the 2dF and other large redshift surveys using a new continuous parameter eta=0.44pc1 - pc2, based on a Principal Components Analysis (where pc1 and pc2 are the projections onto the first and second principal components respectively). This parameter is designed to be robust to instrumental uncertainties and it represents the absorption/emission strength of a galaxy.

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