# The Systematics of Galaxy Morphology in the Comprehensive de Vaucouleurs revised Hubble-Sandage Classification System: Application to the EFIGI Sample

## TL;DR

This study applies the comprehensive de Vaucouleurs revised Hubble-Sandage classification to the EFIGI galaxy sample, detailing galactic structures and features to enhance understanding of galaxy morphology and evolution.

## Contribution

It provides a detailed morphological classification of the EFIGI galaxy sample using the CVRHS system, highlighting structural features relevant to galactic evolution and potential for automated classification.

## Key findings

- Identification of diverse galactic features such as skewed bars and pseudorings.
- Recognition of morphological features linked to secular evolution.
- Discussion on using classifications for training automated algorithms.

## Abstract

This paper is the third which examines galaxy morphology from the point of view of comprehensive de Vaucouleurs revised Hubble-Sandage (CVRHS) classification, a variation on the original de Vaucouleurs classification volume that accounts for finer details of galactic structure, including lenses, nuclear structures, embedded disks, boxy and disky components, and other features. The classification is applied to the EFIGI sample, a well-defined set of nearby galaxies which were previously examined by Baillard et al. and de Lapparent et al. The survey is focussed on statistics of features, and brings attention to exceptional examples of some morphologies, such as skewed bars, blue bar ansae, bar-outer pseudoring misalignment, extremely elongated inner SB rings, outer rings and lenses, and other features that are likely relevant to galactic secular evolution and internal dynamics. The possibility of using these classifications as a training set for automated classification algorithms is also discussed.