Correlating galaxy morphologies and spectra in the 2dFGRS

Abstract

The correlation between a galaxy's morphology and its observed optical spectrum is investigated. As an example, 4000 galaxies from the 2dF Galaxy Redshift Survey, which possess both good quality spectra and have visually determined morphologies are analysed. Of particular use is the separation of Early and Late type galaxies present in a redshift survey since these can then be used in their respective redshift-independent distance estimators (Dn-sigma and Tully-Fisher). It is determined that galaxies in this sample can be relatively successfully separated into these two types by the use of various statistical methods. These methods are briefly outlined in this paper and are also compared to the default 2dFGRS spectral classification (eta). In addition it is found that the 4000Ang break in the spectrum is the best discriminant in determining its morphological type.

LaTex, 12 pages, 11 figures. Accepted for publication in MNRAS

Cited by in corpus (16)

• Data Mining and Machine Learning in Astronomy
• The 2dF Galaxy Redshift Survey: galaxy clustering per spectral type
• Galaxy Types in the Sloan Digital Sky Survey Using Supervised Artificial Neural Networks
• The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to $z\sim 5$
• The 2dF Galaxy Redshift Survey: the local E+A galaxy population
• The Cosmic Lens All-Sky Survey: statistical strong lensing, cosmological parameters, and global properties of galaxy populations
• The DAWES review 10: The impact of deep learning for the analysis of galaxy surveys
• Automatic unsupervised classification of all SDSS/DR7 galaxy spectra
• Constraining evolution in the Halo Model using galaxy redshift surveys
• The Millennium Galaxy Catalogue: On the natural sub-division of galaxies
• Critical analysis of the luminosity functions per galaxy type measured from redshift surveys
• The DEEP2 Galaxy Redshift Survey: Probing the Evolution of Dark Matter Halos around Isolated Galaxies at z ~ 1
• The nature of the relative bias between galaxies of different spectral type in 2dFGRS
• Constraints on Velocity Dispersion Function of Early-type Galaxies from the Statistics of Strong Gravitational Lensing
• Dynamical segregation of galaxies in groups and clusters
• A young galaxy cluster in the old Universe